Sources and method

Where each fact comes from

This directory holds no data of its own and no opinions. It joins public government files and says which one each fact comes from. Here is each file, its date and its limits.

01

Federal provider registry (NPPES)

Centers for Medicare & Medicaid Services

September 2026 release

What it says
The name, address, phone, dentists and specialties of each practice with an active record.
What it does not prove
It does not confirm the practice is still open. Each dentist updates their own record, and some have not changed in years. That is why we show the date of the last update.
Open the source

02

Medicaid payments by provider (T-MSIS)

U.S. Department of Health and Human Services

2024 payments, release of February 9, 2026

What it says
Which providers billed Medicaid or CHIP for dental procedures in 2024, in how many months and for which kind of care.
What it does not prove
It does not say whether the practice takes new patients today. The file leaves out rows with fewer than 12 patients, so a practice without the mark may still take Medicaid.
Open the source

03

Health centers and their sites (HRSA)

Health Resources and Services Administration

UDS report for 2025 and site list of October 5, 2026

What it says
Which federally funded organizations reported dental visits, and the address of each of their sites.
What it does not prove
The report is per organization, not per site. We only call a site a dental clinic when its own name says so; the others are listed apart, with a note to call and ask.
Open the source

04

Medi-Cal Dental provider listing

California Department of Health Care Services

Checked on October 5, 2026

What it says
Which California practices are enrolled in Medi-Cal Dental and which languages are spoken at each.
What it does not prove
It covers California only. For other states we do not yet have an official fact about language.
Open the source

05

OpenStreetMap (websites only)

OpenStreetMap contributors, ODbL license

Checked on October 5, 2026

What it says
The website of a practice, when the map has a dentist with the same phone number as the federal registry.
What it does not prove
It is not an official record: the public edits it. That is why a website shows with a note that it is not verified, and we use it for nothing else.
Open the source

How we build the directory

  1. We take the 210,763 addresses with dentists in the federal registry and publish the 1746 cities with 25 practices or more. Other cities come next.
  2. Registry records that share an address form one practice. When a building has several, we split them by phone number and suite.
  3. A fact enters only if an official file states it. We only assert what the file asserts: we never mark a practice as not taking Medicaid.
  4. We do not call or visit practices, and nobody pays to be listed or to rank higher.
  5. We show no reviews and no prices. The Map and reviews button opens the practice in Google Maps, where its patients’ reviews are.

See a wrong fact?

Write to us from the privacy notice. If the mistake is in the federal registry, the practice can correct its NPPES record and the change arrives here with the next release.

Privacy notice and contact

Data updated on October 5, 2026.