NPI (National Provider Identifier)
National Provider Identifier
The 10-digit HIPAA standard identifier for health care providers.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Enrollment
- Acronym for
- National Provider Identifier
- Primary sources
- 1
- Workspace handoff
- compliance binder →
Where this comes up
Credentialing and revenue-cycle staff handle this — CAQH ProView upkeep, payer-roster validation, NPI maintenance, PECOS revalidation cycles, and the gap between application and effective date that strands new providers. Lapses here block payment until backdated re-enrollment closes the gap.
Full definition
What it is in practice
CMS NPI Standard requires every individual provider (Type 1) and organization (Type 2) to have an NPI. Issued through NPPES.
How it shows up in your practice
Every claim carries rendering, billing, referring, and ordering NPIs. A bad NPI is a guaranteed rejection — validate at credentialing and again before billing.
Sources
- CMS — NPI Standardhttps://www.cms.gov/regulations-and-guidance/administrative-simplification/nationalprovidentstand
Track NPIs in the Compliance Binder roster
Open compliance binder →Related terms
- EnrollmentPECOS (Provider Enrollment System)The CMS online Provider Enrollment, Chain, and Ownership System used to submit and manage Medicare enrollment applications.
- EnrollmentCMS-855 (Medicare Enrollment Application)Family of Medicare enrollment applications: 855A (institutional), 855B (group), 855I (individual), 855O (ordering/referring), 855R (reassignment).
- EnrollmentCAQH CredentialingThe CAQH ProView database used by most commercial payers to credential providers.
- EnrollmentTaxonomy CodeA 10-character code that classifies provider specialties for HIPAA transactions.
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Related across the archive
- GlossaryTaxonomy CodeA 10-character code that classifies provider specialties for HIPAA transactions.
- GlossaryCAQH CredentialingThe CAQH ProView database used by most commercial payers to credential providers.
- GlossaryCMS-855 (Medicare Enrollment Application)Family of Medicare enrollment applications: 855A (institutional), 855B (group), 855I (individual), 855O (ordering/referring), 855R (reassignment).
- GlossaryPECOS (Provider Enrollment System)The CMS online Provider Enrollment, Chain, and Ownership System used to submit and manage Medicare enrollment applications.
- RegulationCMS-855A: Medicare Enrollment for Institutional ProvidersMedicare enrollment application for institutional providers including hospitals, CAHs, hospices, home health agencies, federally qualified health centers, rural health clinics, and similar entities.
- RegulationCMS-855B: Medicare Enrollment Application for Clinics and Group PracticesThe Medicare enrollment application for clinics, group practices, and certain other suppliers — the primary enrollment vehicle for medical practices that bill Part B.
- RegulationCMS-855I: Medicare Enrollment Application for Individual Physicians and Non-Physician PractitionersIndividual Medicare enrollment vehicle for physicians, NPPs, and certain other individual suppliers; required for any clinician billing Medicare under their own name.
- RegulationCMS-855O: Medicare Enrollment for Eligible Ordering and Certifying Physicians and Other Eligible ProfessionalsAbbreviated Medicare enrollment for clinicians who order or certify items and services for Medicare beneficiaries but do not personally bill Medicare.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.