Understanding the language of credentialing
Healthcare credentialing operates through a specialized vocabulary of federal agencies, payer processes, credential systems, and industry-specific terminology. Understanding these terms is essential for navigating provider enrollment discussions, evaluating credentialing services, and communicating effectively with payers and internal teams.
This glossary defines the 40+ most important terms in healthcare provider credentialing and payer enrollment. Each term includes a plain-language definition written for practice administrators, physicians, and healthcare operations professionals who need to understand credentialing without becoming specialists themselves.
APRN Compact
Interstate compact for advanced practice registered nurses (including nurse practitioners) allowing multi-state license portability in participating states.
Attestation
Formal provider verification that credential information is current and accurate. CAQH requires attestation every 120 days; No Surprises Act requires 90-day directory attestation.
CAQH ProView
A centralized commercial credential database used by 1,000+ US health plans to collect and verify provider credentials. Requires re-attestation every 120 days.
Credentialing
The process by which insurance payers verify a provider's qualifications, licensure, education, training, and background to determine network eligibility.
CMS
Centers for Medicare & Medicaid Services — federal agency administering Medicare and overseeing Medicaid. Sets enrollment standards for both programs.
Closed Panel
Payer status indicating the network is not accepting new providers in a specific specialty and geographic area. Can be reopened through formal request.
CPT Code
Current Procedural Terminology code identifying a specific medical service. Used for claim submission. Payer credentialing must include appropriate CPT codes for practice.
CHOW
Change of Ownership — CMS notification requirement when a medical practice changes ownership. Triggers Medicare enrollment updates or new applications.
CVO
Credentialing Verification Organization — external service that conducts primary source verification for payers, hospitals, or credentialing services.
DEA Registration
Drug Enforcement Administration registration required for prescribing controlled substances. Must be renewed every 3 years and maintained in each state of practice.
Development Letter
Payer request for additional information or documentation during credentialing review. Slow response extends timelines. Same-day response is best practice.
Enrollment
The administrative registration of a credentialed provider in a payer's billing system, establishing an active in-network billing relationship.
EFT / ERA
Electronic Funds Transfer / Electronic Remittance Advice — payer setup for electronic payment and remittance data. Must be enrolled separately with each payer.
Form 855
Medicare enrollment paper form. 855I for individual practitioners, 855B for group practices, 855R for reassignment of benefits. Mostly replaced by PECOS online.
Fee-For-Service (FFS)
Traditional payment model where providers bill for each service. Traditional Medicare and non-managed Medicaid use fee-for-service. Contrasts with managed care.
FPPE
Focused Professional Practice Evaluation — hospital process by which newly privileged providers demonstrate clinical competency before receiving full privileges.
Fee Schedule
Payer's payment amounts for specific CPT codes. Commercial fee schedules are often negotiable; Medicare and Medicaid fee schedules are fixed by regulation.
IMLC
Interstate Medical Licensure Compact — agreement among 40+ states allowing qualifying physicians to obtain multi-state licenses through an expedited process.
MAC
Medicare Administrative Contractor — one of 12 regional contractors that process Medicare Part B enrollment applications and claims. Jurisdiction is based on service location.
MBHO
Managed Behavioral Health Organization — carve-out vendor (Optum, Carelon, Beacon) that manages behavioral health networks separately from the medical network.
MCO
Managed Care Organization — private insurers contracted by state Medicaid programs to manage Medicaid networks. Require separate credentialing from fee-for-service Medicaid.
Medicare Advantage (MA)
Managed Medicare plans operated by private insurers under contract with CMS. Require separate credentialing from traditional Medicare Part B.
NPI
National Provider Identifier — a 10-digit unique identifier issued by CMS to healthcare providers. Type 1 NPIs are individual; Type 2 NPIs are for organizations/groups.
NCQA
National Committee for Quality Assurance — sets credentialing standards for commercial payers including required verification methods and timelines.
NPPES
National Plan and Provider Enumeration System — CMS database that stores NPI records. Address changes and taxonomy updates must be maintained here.
Network Adequacy
Regulatory requirement that payers maintain sufficient provider access for their members. Used to justify panel reopenings when access gaps exist.
No Surprises Act
Federal law (effective 2022) requiring accurate payer directories with 90-day provider attestation and out-of-network billing protections for patients.
OPPE
Ongoing Professional Practice Evaluation — hospital process for periodic performance review of privileged providers. Required by Joint Commission accreditation.
PECOS
CMS Provider Enrollment, Chain, and Ownership System — the online enrollment system for Medicare Part B enrollment. Used for Form 855 applications and revalidation.
PTAN
Provider Transaction Access Number — the unique Medicare identifier issued after PECOS enrollment approval. Required alongside NPI to bill Medicare claims.
Privileging
The process by which a specific hospital or facility grants a provider the right to admit patients, perform procedures, and use facility resources. Facility-specific.
Panel Reopening
Formal request to a commercial payer with a closed panel to accept a new provider. Requires documentation of patient access gaps and network adequacy needs.
Primary Source Verification
Direct verification of provider credentials (licenses, education, certifications) from the issuing source rather than provider-supplied copies. Required by NCQA.
Recredentialing
Periodic re-verification of provider credentials required by payers every 2–3 years for commercial (NCQA standards). Missing deadline results in network termination.
Revalidation
Medicare's periodic re-verification of enrollment, required every 3–5 years depending on provider type. Missing deadline deactivates Medicare billing privileges.
Reassignment of Benefits
Formal process by which an individual provider assigns their right to collect payer reimbursements to a group practice entity. Required for group billing.
Taxonomy Code
A 10-character code identifying a healthcare provider's specialty and classification. Must match between NPPES, CAQH, and payer applications.
Type 1 NPI
Individual provider NPI issued to a single healthcare professional. Follows the provider through their career regardless of employment or practice location.
Type 2 NPI
Organizational NPI issued to a group practice, hospital, or other healthcare entity. Used for billing under a group TIN with reassignment of benefits.
TIN
Tax Identification Number — used for tax reporting and payer enrollment as a billing entity. Group practices bill under a group TIN with individual providers assigning benefits.
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