What is PECOS?
PECOS (Provider Enrollment, Chain, and Ownership System) is the CMS database that manages Medicare provider enrollment, tracks ownership structures, and determines which providers are eligible to bill Medicare.
Updated February 2026
PECOS Explained
PECOS is distinct from NPPES. While NPPES assigns and stores NPI numbers, PECOS manages Medicare enrollment status. A provider can have an NPI but not be enrolled in PECOS, meaning they have an identifier but aren't approved to bill Medicare. The two systems use NPI as a common identifier but serve different purposes.
PECOS contains detailed information about provider enrollment status, practice locations, reassignment relationships (which organization bills on behalf of which provider), and ownership/control interests. This ownership chain data is particularly valuable for understanding healthcare organization structures.
For B2B data buyers, PECOS enrollment status is a useful signal. Providers enrolled in Medicare are actively practicing and seeing patients. Providers not in PECOS may be cash-only practices, non-clinical roles, or retired providers who never deactivated their NPI. PECOS data also helps identify which practice groups a provider bills through, revealing organizational relationships that aren't visible in NPPES alone.
Why PECOS Matters for Healthcare Data
PECOS enrollment confirms that a provider is actively billing Medicare, which is a strong signal that they're actively practicing. PECOS ownership data also reveals organizational relationships between providers and practice groups, useful for mapping health system hierarchies and identifying decision-makers.
Real-World Example
A pharma sales team cross-references their target physician list against PECOS to confirm active Medicare enrollment. They find that 8% of their list contains providers who aren't enrolled in PECOS, suggesting they may not be actively seeing Medicare patients. By filtering these out, the team focuses outreach on confirmed active providers.
Frequently Asked Questions
Is PECOS data publicly available?
Partially. CMS publishes enrollment and reassignment data through the Medicare Provider Enrollment files, but the full PECOS database is not publicly searchable in the same way NPPES is. Some data is available through the Medicare Provider Utilization and Payment Data files.
What is the difference between NPPES and PECOS?
NPPES assigns NPI numbers and maintains the provider identity registry. PECOS manages Medicare enrollment and billing eligibility. A provider needs an NPI first (from NPPES), then enrolls in Medicare through PECOS to bill Medicare.
How do you check if a provider is enrolled in PECOS?
CMS provides online verification through the Medicare Provider Enrollment portal. Some data vendors also include PECOS enrollment status as an enrichment field in their provider databases.
Sources and References
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