{
  "name": "Data behind: Physician email list: what the NPI registry shows",
  "description": "39 NPI counts by entity type, primary specialty, practice state, time since last update and update history from the CMS NPPES September 2026 file (records to 13 September 2026). One row per published figure, plus one row per derived figure with its formula and inputs. Taxonomy codes are self-reported; counts are NPI records, not people.",
  "dateModified": "2026-09-13",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "fixture": false,
  "columns": [
    "id",
    "kind",
    "entity",
    "attribute",
    "scenario",
    "value",
    "number",
    "unit",
    "scope",
    "input_price_scope",
    "scenario_scope",
    "formula",
    "expression",
    "source_owner",
    "source_url",
    "observed_at",
    "fixture"
  ],
  "grain": "one row per aggregate group (each published figure), plus one row per derived figure with its formula and inputs",
  "rows": [
    {
      "id": "r01",
      "kind": "observed",
      "entity": "Active individual NPIs in the Allopathic and Osteopathic Physicians grouping",
      "attribute": "Total active physician NPIs",
      "scenario": "",
      "value": "1,252,140 active individual physician NPIs",
      "number": 1252140,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r02",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Internal Medicine",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "308,743 of the 1,252,140 active individual physician NPIs (24.7%)",
      "number": 308743,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r03",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Family Medicine",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "166,715 of the 1,252,140 active individual physician NPIs (13.3%)",
      "number": 166715,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r04",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Pediatrics",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "112,163 of the 1,252,140 active individual physician NPIs (9.0%)",
      "number": 112163,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r05",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Psychiatry & Neurology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "97,805 of the 1,252,140 active individual physician NPIs (7.8%)",
      "number": 97805,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r06",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Emergency Medicine",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "76,190 of the 1,252,140 active individual physician NPIs (6.1%)",
      "number": 76190,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r07",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Anesthesiology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "68,970 of the 1,252,140 active individual physician NPIs (5.5%)",
      "number": 68970,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r08",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Radiology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "61,460 of the 1,252,140 active individual physician NPIs (4.9%)",
      "number": 61460,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r09",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Obstetrics & Gynecology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "59,864 of the 1,252,140 active individual physician NPIs (4.8%)",
      "number": 59864,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r10",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Surgery",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "50,180 of the 1,252,140 active individual physician NPIs (4.0%)",
      "number": 50180,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r11",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Orthopaedic Surgery",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "37,594 of the 1,252,140 active individual physician NPIs (3.0%)",
      "number": 37594,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r12",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Hospitalist",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "28,152 of the 1,252,140 active individual physician NPIs (2.2%)",
      "number": 28152,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r13",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Ophthalmology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "26,265 of the 1,252,140 active individual physician NPIs (2.1%)",
      "number": 26265,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r14",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Pathology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "24,447 of the 1,252,140 active individual physician NPIs (2.0%)",
      "number": 24447,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r15",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Physical Medicine & Rehabilitation",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "20,163 of the 1,252,140 active individual physician NPIs (1.6%)",
      "number": 20163,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r16",
      "kind": "observed",
      "entity": "Physicians whose primary taxonomy classification is Dermatology",
      "attribute": "Physicians per primary specialty",
      "scenario": "",
      "value": "19,102 of the 1,252,140 active individual physician NPIs (1.5%)",
      "number": 19102,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r17",
      "kind": "observed",
      "entity": "Physician classifications listed in the specialty table",
      "attribute": "Physician classifications listed",
      "scenario": "",
      "value": "15 of 37 physician classifications (those with at least 10 active individual NPIs)",
      "number": 15,
      "unit": "classifications",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r18",
      "kind": "observed",
      "entity": "Physicians practising in CA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "141,808 of the 1,252,140 active individual physician NPIs (11.3%)",
      "number": 141808,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r19",
      "kind": "observed",
      "entity": "Physicians practising in NY",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "91,933 of the 1,252,140 active individual physician NPIs (7.3%)",
      "number": 91933,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r20",
      "kind": "observed",
      "entity": "Physicians practising in TX",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "86,647 of the 1,252,140 active individual physician NPIs (6.9%)",
      "number": 86647,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r21",
      "kind": "observed",
      "entity": "Physicians practising in FL",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "79,664 of the 1,252,140 active individual physician NPIs (6.4%)",
      "number": 79664,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r22",
      "kind": "observed",
      "entity": "Physicians practising in PA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "59,764 of the 1,252,140 active individual physician NPIs (4.8%)",
      "number": 59764,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r23",
      "kind": "observed",
      "entity": "Physicians practising in IL",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "52,325 of the 1,252,140 active individual physician NPIs (4.2%)",
      "number": 52325,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r24",
      "kind": "observed",
      "entity": "Physicians practising in OH",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "46,039 of the 1,252,140 active individual physician NPIs (3.7%)",
      "number": 46039,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r25",
      "kind": "observed",
      "entity": "Physicians practising in MI",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "41,508 of the 1,252,140 active individual physician NPIs (3.3%)",
      "number": 41508,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r26",
      "kind": "observed",
      "entity": "Physicians practising in MA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "40,373 of the 1,252,140 active individual physician NPIs (3.2%)",
      "number": 40373,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r27",
      "kind": "observed",
      "entity": "Physicians practising in NC",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "36,322 of the 1,252,140 active individual physician NPIs (2.9%)",
      "number": 36322,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r28",
      "kind": "observed",
      "entity": "Physicians practising in NJ",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "33,753 of the 1,252,140 active individual physician NPIs (2.7%)",
      "number": 33753,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r29",
      "kind": "observed",
      "entity": "Physicians practising in GA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "32,676 of the 1,252,140 active individual physician NPIs (2.6%)",
      "number": 32676,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r30",
      "kind": "observed",
      "entity": "Physicians practising in WA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "30,911 of the 1,252,140 active individual physician NPIs (2.5%)",
      "number": 30911,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r31",
      "kind": "observed",
      "entity": "Physicians practising in VA",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "30,750 of the 1,252,140 active individual physician NPIs (2.5%)",
      "number": 30750,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r32",
      "kind": "observed",
      "entity": "Physicians practising in MD",
      "attribute": "Physicians per practice state",
      "scenario": "",
      "value": "26,648 of the 1,252,140 active individual physician NPIs (2.1%)",
      "number": 26648,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r33",
      "kind": "observed",
      "entity": "Physician NPI records last updated under 1 year before 1 October 2026 (last updated within five years of 1 October 2026)",
      "attribute": "Update age of physician NPI records",
      "scenario": "",
      "value": "183,642 of the 1,252,140 active physician NPI records (14.7%)",
      "number": 183642,
      "unit": "NPI records",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r34",
      "kind": "observed",
      "entity": "Physician NPI records last updated 1 to 3 years before 1 October 2026 (last updated within five years of 1 October 2026)",
      "attribute": "Update age of physician NPI records",
      "scenario": "",
      "value": "232,805 of the 1,252,140 active physician NPI records (18.6%)",
      "number": 232805,
      "unit": "NPI records",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r35",
      "kind": "observed",
      "entity": "Physician NPI records last updated 3 to 5 years before 1 October 2026 (last updated within five years of 1 October 2026)",
      "attribute": "Update age of physician NPI records",
      "scenario": "",
      "value": "185,169 of the 1,252,140 active physician NPI records (14.8%)",
      "number": 185169,
      "unit": "NPI records",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r36",
      "kind": "observed",
      "entity": "Physician NPI records last updated 5 to 10 years before 1 October 2026 (last updated five or more years before 1 October 2026)",
      "attribute": "Update age of physician NPI records",
      "scenario": "",
      "value": "240,190 of the 1,252,140 active physician NPI records (19.2%)",
      "number": 240190,
      "unit": "NPI records",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r37",
      "kind": "observed",
      "entity": "Physician NPI records last updated 10 years or more before 1 October 2026 (last updated five or more years before 1 October 2026)",
      "attribute": "Update age of physician NPI records",
      "scenario": "",
      "value": "410,334 of the 1,252,140 active physician NPI records (32.8%)",
      "number": 410334,
      "unit": "NPI records",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r38",
      "kind": "observed",
      "entity": "Active physician NPI records updated at least once",
      "attribute": "Physician records by update history",
      "scenario": "",
      "value": "1,189,214 records (95.0%)",
      "number": 1189214,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "r39",
      "kind": "observed",
      "entity": "Active physician NPI records never updated after enumeration",
      "attribute": "Physician records by update history",
      "scenario": "",
      "value": "62,926 records (5.0%)",
      "number": 62926,
      "unit": "NPIs",
      "scope": "",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "",
      "expression": "",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d01",
      "kind": "derived",
      "entity": "Top 3 by Physicians per primary specialty combined (Internal Medicine, Family Medicine and Pediatrics)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "587,621 NPIs",
      "number": 587621.0,
      "unit": "NPIs",
      "scope": "inputs r02, r03, r04",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "308,743 + 166,715 + 112,163",
      "expression": "308743+166715+112163",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d02",
      "kind": "derived",
      "entity": "Top 3 by Physicians per primary specialty: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "46.9%",
      "number": 46.9,
      "unit": "%",
      "scope": "inputs r01, r02, r03, r04",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "587,621 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(308743+166715+112163)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d03",
      "kind": "derived",
      "entity": "Top 5 by Physicians per primary specialty combined (Internal Medicine, Family Medicine, Pediatrics, Psychiatry & Neurology and Emergency Medicine)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "761,616 NPIs",
      "number": 761616.0,
      "unit": "NPIs",
      "scope": "inputs r02, r03, r04, r05, r06",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "308,743 + 166,715 + 112,163 + 97,805 + 76,190",
      "expression": "308743+166715+112163+97805+76190",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d04",
      "kind": "derived",
      "entity": "Top 5 by Physicians per primary specialty: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "60.8%",
      "number": 60.8,
      "unit": "%",
      "scope": "inputs r01, r02, r03, r04, r05, r06",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "761,616 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(308743+166715+112163+97805+76190)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d05",
      "kind": "derived",
      "entity": "The 15 listed by Physicians per primary specialty combined",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "1,157,813 NPIs",
      "number": 1157813.0,
      "unit": "NPIs",
      "scope": "inputs r02, r03, r04, r05, r06, r07, r08, r09, r10, r11, r12, r13, r14, r15, r16",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "sum of the 15 listed figures",
      "expression": "308743+166715+112163+97805+76190+68970+61460+59864+50180+37594+28152+26265+24447+20163+19102",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d06",
      "kind": "derived",
      "entity": "Outside the 15 listed by Physicians per primary specialty (the 1,252,140 active individual physician NPIs)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "94,327 NPIs",
      "number": 94327.0,
      "unit": "NPIs",
      "scope": "inputs r01, r02, r03, r04, r05, r06, r07, r08, r09, r10, r11, r12, r13, r14, r15, r16",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "1,252,140 − 1,157,813",
      "expression": "1252140-(308743+166715+112163+97805+76190+68970+61460+59864+50180+37594+28152+26265+24447+20163+19102)",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d07",
      "kind": "derived",
      "entity": "Outside the 15 listed by Physicians per primary specialty: share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "7.5%",
      "number": 7.5,
      "unit": "%",
      "scope": "inputs r01, r02, r03, r04, r05, r06, r07, r08, r09, r10, r11, r12, r13, r14, r15, r16",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "94,327 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(1252140-(308743+166715+112163+97805+76190+68970+61460+59864+50180+37594+28152+26265+24447+20163+19102))/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d08",
      "kind": "derived",
      "entity": "Outside the top 5 by Physicians per primary specialty (the 1,252,140 active individual physician NPIs)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "490,524 NPIs",
      "number": 490524.0,
      "unit": "NPIs",
      "scope": "inputs r01, r02, r03, r04, r05, r06",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "1,252,140 − 761,616",
      "expression": "1252140-(308743+166715+112163+97805+76190)",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d09",
      "kind": "derived",
      "entity": "Outside the top 5 by Physicians per primary specialty: share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "39.2%",
      "number": 39.2,
      "unit": "%",
      "scope": "inputs r01, r02, r03, r04, r05, r06",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "490,524 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(1252140-(308743+166715+112163+97805+76190))/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d10",
      "kind": "derived",
      "entity": "The 10 outside the top 5 by Physicians per primary specialty combined",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "396,197 NPIs",
      "number": 396197.0,
      "unit": "NPIs",
      "scope": "inputs r07, r08, r09, r10, r11, r12, r13, r14, r15, r16",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "sum of the 10 smaller figures",
      "expression": "68970+61460+59864+50180+37594+28152+26265+24447+20163+19102",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d11",
      "kind": "derived",
      "entity": "The 10 outside the top 5 by Physicians per primary specialty: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "31.6%",
      "number": 31.6,
      "unit": "%",
      "scope": "inputs r01, r07, r08, r09, r10, r11, r12, r13, r14, r15, r16",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "396,197 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(68970+61460+59864+50180+37594+28152+26265+24447+20163+19102)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d12",
      "kind": "derived",
      "entity": "Top 3 by Physicians per practice state combined (CA, NY and TX)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "320,388 NPIs",
      "number": 320388.0,
      "unit": "NPIs",
      "scope": "inputs r18, r19, r20",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "141,808 + 91,933 + 86,647",
      "expression": "141808+91933+86647",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d13",
      "kind": "derived",
      "entity": "Top 3 by Physicians per practice state: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "25.6%",
      "number": 25.6,
      "unit": "%",
      "scope": "inputs r01, r18, r19, r20",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "320,388 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(141808+91933+86647)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d14",
      "kind": "derived",
      "entity": "Top 5 by Physicians per practice state combined (CA, NY, TX, FL and PA)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "459,816 NPIs",
      "number": 459816.0,
      "unit": "NPIs",
      "scope": "inputs r18, r19, r20, r21, r22",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "141,808 + 91,933 + 86,647 + 79,664 + 59,764",
      "expression": "141808+91933+86647+79664+59764",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d15",
      "kind": "derived",
      "entity": "Top 5 by Physicians per practice state: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "36.7%",
      "number": 36.7,
      "unit": "%",
      "scope": "inputs r01, r18, r19, r20, r21, r22",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "459,816 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(141808+91933+86647+79664+59764)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d16",
      "kind": "derived",
      "entity": "The 15 listed by Physicians per practice state combined",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "831,121 NPIs",
      "number": 831121.0,
      "unit": "NPIs",
      "scope": "inputs r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "sum of the 15 listed figures",
      "expression": "141808+91933+86647+79664+59764+52325+46039+41508+40373+36322+33753+32676+30911+30750+26648",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d17",
      "kind": "derived",
      "entity": "Outside the 15 listed by Physicians per practice state (the 1,252,140 active individual physician NPIs)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "421,019 NPIs",
      "number": 421019.0,
      "unit": "NPIs",
      "scope": "inputs r01, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "1,252,140 − 831,121",
      "expression": "1252140-(141808+91933+86647+79664+59764+52325+46039+41508+40373+36322+33753+32676+30911+30750+26648)",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d18",
      "kind": "derived",
      "entity": "Outside the 15 listed by Physicians per practice state: share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "33.6%",
      "number": 33.6,
      "unit": "%",
      "scope": "inputs r01, r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "421,019 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(1252140-(141808+91933+86647+79664+59764+52325+46039+41508+40373+36322+33753+32676+30911+30750+26648))/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d19",
      "kind": "derived",
      "entity": "Outside the top 5 by Physicians per practice state (the 1,252,140 active individual physician NPIs)",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "792,324 NPIs",
      "number": 792324.0,
      "unit": "NPIs",
      "scope": "inputs r01, r18, r19, r20, r21, r22",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "1,252,140 − 459,816",
      "expression": "1252140-(141808+91933+86647+79664+59764)",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d20",
      "kind": "derived",
      "entity": "Outside the top 5 by Physicians per practice state: share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "63.3%",
      "number": 63.3,
      "unit": "%",
      "scope": "inputs r01, r18, r19, r20, r21, r22",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "792,324 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(1252140-(141808+91933+86647+79664+59764))/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d21",
      "kind": "derived",
      "entity": "The 10 outside the top 5 by Physicians per practice state combined",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "371,305 NPIs",
      "number": 371305.0,
      "unit": "NPIs",
      "scope": "inputs r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "sum of the 10 smaller figures",
      "expression": "52325+46039+41508+40373+36322+33753+32676+30911+30750+26648",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d22",
      "kind": "derived",
      "entity": "The 10 outside the top 5 by Physicians per practice state: combined share of the 1,252,140 active individual physician NPIs",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "29.7%",
      "number": 29.7,
      "unit": "%",
      "scope": "inputs r01, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "371,305 ÷ 1,252,140 × 100 (the 1,252,140 active individual physician NPIs)",
      "expression": "(52325+46039+41508+40373+36322+33753+32676+30911+30750+26648)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d23",
      "kind": "derived",
      "entity": "Jurisdictions outside the 15 listed practice states",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "36 of 51 jurisdictions (50 states and DC), not included in this comparison",
      "number": 36,
      "unit": "",
      "scope": "inputs r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r28, r29, r30, r31, r32",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "51 jurisdictions (50 states and DC) − 15 listed",
      "expression": "51-15",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d24",
      "kind": "derived",
      "entity": "Physician NPI records last updated five or more years before 1 October 2026",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "650,524 NPI records",
      "number": 650524.0,
      "unit": "NPI records",
      "scope": "inputs r36, r37",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "410,334 + 240,190",
      "expression": "410334+240190",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d25",
      "kind": "derived",
      "entity": "Share of physician NPI records last updated five or more years before 1 October 2026",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "52.0%",
      "number": 52.0,
      "unit": "%",
      "scope": "inputs r01, r36, r37",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "650,524 ÷ 1,252,140 × 100 (the 1,252,140 active physician NPI records)",
      "expression": "(410334+240190)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d26",
      "kind": "derived",
      "entity": "Physician NPI records last updated within five years of 1 October 2026",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "601,616 NPI records",
      "number": 601616.0,
      "unit": "NPI records",
      "scope": "inputs r33, r34, r35",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "232,805 + 185,169 + 183,642",
      "expression": "232805+185169+183642",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "https://download.cms.gov/nppes/NPI_Files.html",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d27",
      "kind": "derived",
      "entity": "Share of physician NPI records last updated within five years of 1 October 2026",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "48.0%",
      "number": 48.0,
      "unit": "%",
      "scope": "inputs r01, r33, r34, r35",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "601,616 ÷ 1,252,140 × 100 (the 1,252,140 active physician NPI records)",
      "expression": "(232805+185169+183642)/1252140*100",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    },
    {
      "id": "d28",
      "kind": "derived",
      "entity": "Outside: Physician classifications listed in the specialty table",
      "attribute": "Derived figure",
      "scenario": "",
      "value": "22 of 37 physician classifications",
      "number": 22,
      "unit": "classifications",
      "scope": "inputs r17",
      "input_price_scope": "",
      "scenario_scope": "",
      "formula": "37 − 15",
      "expression": "37-15",
      "source_owner": "Provyx aggregation of the CMS NPPES monthly file (September 2026 release, records to 13 September 2026)",
      "source_url": "provenance.md#registry-files",
      "observed_at": "2026-09-13",
      "fixture": false
    }
  ]
}