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Providers/States/California

Provider directory · By state

Healthcare providers in California

CMS NPPES registration records for California, aggregated across the 14 medical specialties Fonteum currently tracks, with HRSA HPSA shortage-area context.

Source: CMS NPPES NPI Registry — supply by state·Snapshot: 2026-05-06 – 2026-05-07·Method: nppes-supply-by-state/v2026.05·ID: nppes-supply/california
46,514Providers across 14 tracked specialties in CaliforniaAs of 2026-05-07

46,514 providers in California are tracked across the 14 medical specialties Fonteum currently ingests from the CMS NPPES NPI Registry, snapshotted 2026-05-06 – 2026-05-07. This count covers the 14 specialties currently tracked by Fonteum, not all NPPES-registered providers in California. Each provider record carries field-level provenance back to its federal source.

NPPES dataset · Methodology · Browse by specialty

The substrate, by the numbers

44federal source familiesDistinct CMS, OIG, HRSA, FDA and peer datasets
35dataset pagesCitable, downloadable /data catalog pages
52reproducible studiesEach shipping the SQL behind its figures

Built on the authoritative federal record

The primary sources, named on every page.

These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.

  • CMS
  • HHS-OIG
  • HRSA
  • FDA
  • NLM
  • NUCC
  • Census
  • BLS
  • BEA

See the full source registry, with license and refresh cadence for each →

Reproducible by design

Every figure traces to its federal source.

14-tuple provenance

Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.

Reproducible SQL

Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.

Daily reconciliation

Published counts are reconciled against the upstream federal datasets on a daily cadence, with drift logged.

Named medical review

Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

Read the full provenance and attestation methodology →

Two doors

Use the free API and open data

Query providers, facilities, sanctions, and quality scores — each field carrying its federal source. Self-serve, no call to start.

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Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.

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