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Provider Access Gap Lookup

Type a state or ZIP plus a medical specialty. Get the per-100,000 provider density figure with national percentile, three comparable states, and a citeable result block. CMS NPPES + U.S. Census, fully sourced. Free.

StateSpecialty

Try a high-volume example

Pre-rendered county pages for the eight most-populous U.S. counties × Dermatologists:

How it works

For each specialty, Fonteum filters the loaded CMS NPPES table to the relevant taxonomy codes. Its newest production system date was June 10, 2026 when checked July 12, 2026; that is not a source release date.
State counts are divided by U.S. Census Bureau 2024-vintage population estimates to get density per 100,000 residents.
Each state is ranked by density. The percentile shown is the queried state's position within the 51-jurisdiction ranking (50 states + DC).
For ZIP and county queries, the result surfaces state-level density with the geographic context preserved — NPPES doesn't publish a county-level field of practice in its public API.

Full methodology →

Specialties covered

Each specialty links to its parent Fonteum Research study with the full per-state dataset, methodology, and Limitations.

Source & limitations

Source: U.S. Centers for Medicare & Medicaid Services NPI Registry (NPPES) public API + U.S. Census Bureau Population Estimates Program (PEP), 2024 vintage. Snapshot date is published on every result page.

This tool measures density, not access. Drive time, appointment availability, insurance acceptance, and wait times are not modeled. The full Limitations doctrine is repeated on every result page.

Free to cite with attribution to Fonteum Research and a link to this tool.

What’s on file, by the numbers

Platform snapshot · 2026-08-14

13.4Mproviders & companiesProviders, organizations, owners, and facilities on file

26.2Msource-linked factsSource-linked field facts in the dated platform snapshot

90sources with dataDistinct snapshot source IDs with at least one positive record count

72fresh sourcesDistinct source IDs whose latest positive-data snapshot falls within the preceding 45 days

111sources integratedActive registry rows; integration does not establish a load

13state Medicaid jurisdictionsDistinct states represented in the state-exclusions serving table

Integrated, with-data, and fresh-observation counts are separate. No platform-wide source-completeness count is published. Completeness is source-specific and must be evaluated against the named source's expected scope. State coverage is a separate jurisdiction measure.

Source authority is record-specific

Use the issuer named on the record.

Fonteum spans federal, state, and global public publishers. A source page or returned record identifies its issuer and dataset where that metadata is available. A platform registry count does not assign every page to one authority or establish loaded, fresh, or complete coverage.

Browse source records and their stated limitations →

Reproducible by design

Inspect the evidence each published figure actually supplies.

Source and date

Research pages expose the named public file and observation date where those fields are available. Source-file SHA-256 coverage is separate; facts do not currently link deterministically to signatures.

Available derivation

Studies with a retained release and committed derivation link the SQL or method used. Other studies state the evidence and reproduction limits they actually have.

Daily observations

Dated table row-count observations can detect local drift. They do not imply that an upstream publisher released or Fonteum ingested new data that day.

Named medical review

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

Read the full provenance and attestation methodology →