Overview
PECOS (Provider Enrollment, Chain, and Ownership System) is the Medicare provider enrollment system managed by CMS that maintains records of all providers and suppliers authorized to bill Medicare fee-for-service. Providers and supplier organizations use PECOS to submit initial enrollment applications, update provider information (practice location, services offered, group membership), revalidate enrollment periodically, and terminate Medicare billing privileges when appropriate.
PECOS supports individual providers (physicians, nurse practitioners, physical therapists) and organizational providers/suppliers (hospitals, skilled nursing facilities, home health agencies, DMEPOS suppliers, independent diagnostic testing facilities). Each enrollment type has specific PECOS forms — CMS-855I for individual physicians and non-physician practitioners, CMS-855B for organization medical groups and multi-specialty clinics, CMS-855A for institutional providers (hospitals, SNFs, etc.), CMS-855S for DMEPOS suppliers, and others.
Enrollment information captured in PECOS includes: individual provider demographic information, licensure, education, training, board certifications, work history, tax identification, bank account for electronic funds transfer, practice locations, specialties, services offered, and ownership/chain relationships for organizations. PECOS integrates with NPPES (National Plan and Provider Enumeration System) for NPI (National Provider Identifier) management — NPI is the primary provider identifier used in claim submission.
For RCM, PECOS directly affects Medicare billing eligibility. Providers without active PECOS enrollment cannot bill Medicare; claims submitted under un-enrolled NPIs deny. Ownership and location changes that aren't promptly reflected in PECOS can cause billing disruptions. Revalidation cycles (every 3–5 years depending on provider type) require proactive PECOS updates; missed revalidation deadlines produce deactivation and billing interruption.
PECOS enrollment process typically takes 60–90 days for individual providers; organizational enrollment can take longer due to additional verification. Required documentation includes: completed PECOS application, copies of license and certifications, malpractice insurance documentation, DEA registration (where applicable), ownership documentation for organizations, and specialty-specific documentation. MAC reviewers conduct background checks, verify primary-source credentials, and check OIG/SAM exclusion databases before approval.
Revalidation is a critical periodic requirement. CMS mails revalidation notices 3–5 months before due dates. Providers must submit revalidation applications through PECOS, verify practice information, update any changes, and attest to current accuracy. Failure to revalidate on time results in deactivation of Medicare billing privileges; reactivation requires resubmission and potentially re-verification. Provider enrollment teams maintain revalidation calendars to prevent missed deadlines.
Ordering/Referring physician requirements use PECOS. Since 2010, physicians and non-physician practitioners who order or refer Medicare services (imaging, DME, home health, etc.) must be enrolled in PECOS. Services billed with non-PECOS-enrolled ordering/referring providers deny. Providers who order Medicare services must maintain active PECOS enrollment even if they don't bill Medicare directly.
Ownership and chain relationships in PECOS are complex. Organizations must disclose ownership structures, related parties, and chain affiliations. Material changes in ownership (mergers, acquisitions, management changes) require PECOS updates within 30 days. Failure to report material changes is a compliance violation with potential enforcement consequences.
PECOS online access uses I&A (Identity and Access Management System). Providers create I&A accounts, verify identity, and gain PECOS access. Authorized representatives (office managers, credentialing staff) can have delegated access. Security protocols include two-factor authentication and access audit trails.
Industry benchmark
CMS Medicare Provider Enrollment Forms (CMS-855 series). 42 CFR Part 424 (Medicare enrollment regulations). PECOS system documentation at pecos.cms.hhs.gov.
Worked example
A new physician joins an existing multi-specialty group. Credentialing team submits CMS-855I (individual enrollment) through PECOS, reassigning physician's payments to the group. MAC reviews: primary-source verification of MD degree, residency completion, board certification, state license, DEA, malpractice. Processing time 72 days. Approval letter received with Medicare billing effective date. Physician can bill Medicare as of effective date; services before effective date are retroactively billable if date assigned accordingly. Physician ordering/referring privileges enabled for services like DME and home health.
Frequently asked questions — PECOS (Provider Enrollment, Chain, and Ownership System)
What is PECOS used for?
Medicare provider enrollment, information updates, revalidation, and billing-privilege management. All Medicare fee-for-service providers and suppliers (individuals and organizations) use PECOS to maintain active Medicare billing status. PECOS integrates with NPPES for NPI management.
How long does PECOS enrollment take?
Individual providers typically 60–90 days. Organizational enrollment can take longer due to additional verification. MAC reviewers conduct background checks, primary-source credential verification, and OIG/SAM exclusion checks before approval. Plan provider start dates accordingly.
What is PECOS revalidation?
Periodic re-verification of Medicare enrollment, typically every 3–5 years depending on provider type. CMS sends revalidation notices 3–5 months before due dates. Providers must submit revalidation applications, update information, and attest to accuracy. Missed revalidation deadlines produce deactivation.
Do ordering/referring providers need PECOS?
Yes, since 2010. Physicians and NPPs who order or refer Medicare services (imaging, DME, home health) must be PECOS-enrolled. Services billed with non-PECOS ordering/referring providers deny. Even providers who don't bill Medicare directly must enroll if they order Medicare services.
Disclaimer
This glossary entry is operational reference for revenue-cycle and medical-billing professionals. It is not legal, clinical, or contractual advice. Industry benchmarks cite named public sources where available; always verify against the current guidance from the authority body before relying on a number in a contract, policy, or compliance filing.