Provider directory · By specialty

Healthcare providers — Cardiology

CMS NPPES registration records for the Cardiology specialty, with field-level provenance back to the federal source.

Source: CMS NPPES NPI Registry — supply by state·Snapshot: 2026-05-06·Method: nppes-supply-by-state/v2026.05·ID: nppes-supply/cardiology

35,006Active Cardiology providers (NPPES)As of 2026-05-06 · across all 50 states + DC

35,006 active Cardiology providers are registered in the CMS NPPES NPI Registry across all 50 states and the District of Columbia, snapshotted 2026-05-06. Each record carries field-level provenance back to its federal source.

NPPES dataset · Methodology · Browse by state

The substrate, by the numbers

9.2Mgraph entitiesProviders, organizations, owners, and facilities

12.6Mlinked identifiersNPIs, CCNs, LEIs and more, resolved to entities

4.7Mgraph edgesSource-attested relationships between entities

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

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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.

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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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