NPPES (CMS NPI Registry) vs Doximity: Side-by-Side Comparison
NPPES is the federal primary source for U.S. healthcare provider identity — 8 million+ NPI records, publicly downloadable, weekly-refreshed. Doximity is a professional network where ~80% of U.S. physicians maintain profiles. They serve different purposes: NPPES is the authoritative identifier record; Doximity is the clinician-facing social graph.
NPPES (CMS NPI Registry) vs Doximity, across 8 dimensions
| Dimension | NPPES (CMS NPI Registry) | Doximity |
|---|---|---|
| Data type | Federal provider identity — 10-digit NPI, taxonomy code, practice address | Physician professional network — peer connections, CME, secure messaging, NPI cross-reference |
| Coverage | 8 million+ active NPI records (individuals + organizations) | ~80% of U.S. physicians; 2M+ total clinicians (publicly disclosed) |
| Refresh cadence | Weekly publish by CMS; Fonteum re-checks per practice on a 6-month cycle | Self-maintained by clinicians; no public refresh cadence |
| License / Cost | U.S. government public-domain works (17 U.S.C. § 105) — free to use and redistribute with attribution | Free for clinicians; B2B/pharma advertising — pricing not public |
| API access | Public REST API at npiregistry.cms.hhs.gov/api — no key required for basic lookups | EHR partner integrations; not a public open API |
| Source provenance | Every field carries source + snapshot date + limitation; raw federal record is the direct upstream | NPI cross-reference for identity; self-attested credentials; no per-field provenance chain |
| Primary use case | Canonical provider identity backbone — NPI lookup, taxonomy matching, cross-source joins | Clinician networking, referrals, CME credit, pharma outreach |
| Pricing | Free (federal public domain) | Free for clinicians; pharma/industry licensing — pricing not public |
Cells marked “—” indicate values not publicly documented by the respective platform. No data has been estimated or fabricated.
Which platform fits your team
When to use NPPES (CMS NPI Registry)
Use NPPES when the need is the authoritative federal identity record — NPI number, taxonomy code, practice address, and enumeration date. It is the canonical input for any provider identity pipeline, cross-source join, or credentialing system.
When to use Doximity
Use Doximity when the goal is reaching clinicians directly — for professional networking, CME delivery, or pharma sales-force alignment. Doximity's NPI cross-reference makes its profiles reasonably accurate for identity, but it is a professional network, not a regulatory data source.
Common questions
- Is Doximity a replacement for NPPES?
- No. NPPES is the federal regulatory identity system for healthcare providers. NPI numbers are issued by NPPES and used on HIPAA-covered claims. Doximity is a professional social network that cross-references NPI for identity but is not the issuing authority. For any compliance, billing, or credentialing application, NPPES is the primary source.
- Can I get NPI data from Doximity?
- Doximity cross-references clinician profiles with NPI numbers, but the data is not available in bulk via a public API or download. CMS NPPES provides the full 8M+ NPI record set as a free weekly CSV download and via a public REST API at npiregistry.cms.hhs.gov/api.
- Which is more current — NPPES or Doximity?
- NPPES is published weekly by CMS and is the official record. Doximity profiles are self-maintained by clinicians on their own schedule — some are current, others are not. For regulatory or compliance purposes, NPPES is always the authoritative and more consistently refreshed source.
- What does Fonteum add on top of NPPES?
- Fonteum ingests NPPES and cross-resolves it against CMS PECOS, OIG LEIE, CMS Care Compare, CMS Open Payments, QPP MIPS, and other federal source families on the NPI and CCN identity backbone — adding Medicare enrollment status, exclusion status, facility quality signals, and financial-relationship disclosure in a single provenance-chained record.
Last updated 2026-05-31. See all comparisons at /compare →
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