NPPES data explained
A plain-English explanation of the federal provider registry that powers most of DentistGrid.
What NPPES is
NPPES — the National Plan and Provider Enumeration System — is the federal registry of every healthcare provider in the United States that has been issued a National Provider Identifier (NPI). It is operated by the Centers for Medicare & Medicaid Services (CMS). The public-facing search tool is the NPI Registry; CMS also publishes a monthly bulk file.
What's in NPPES
- NPI number — a unique 10-digit identifier.
- NPI type — Type 1 (individual provider) or Type 2 (organization, e.g. a clinic).
- Legal name of the provider or organization.
- Practice address and mailing address.
- Phone (often a business line; not guaranteed to be a patient-facing number).
- Taxonomy codes — provider's self-selected specialty classification(s).
- Enumeration date — when the NPI was issued.
- Last updated date — when the provider last updated their NPPES record.
- Whether the NPI is currently active or deactivated.
What's not in NPPES
- License status, expiration, or disciplinary history. (Use the state board.)
- Accepted insurance plans or Medicaid/Medicare Advantage participation.
- Hours of operation, languages spoken, accessibility, or photos.
- Whether the practice is accepting new patients.
- Patient reviews or ratings.
- Malpractice records or hospital affiliations.
How DentistGrid uses NPPES
- Search results on our search page are pulled live from NPPES in real time.
- Cached and featured listings store key NPPES fields and show a "Last checked" date — see data refresh schedule.
- Every profile displays NPI, NPI type, taxonomy, practice address, and the NPPES enumeration and last-updated dates, with a link back to the NPI Registry record.
- Fields that NPPES does not contain (insurance, hours, languages, etc.) are only shown when a claimed provider has attested to them.
Limitations
- NPPES taxonomy is provider-self-selected and may not match the provider's day-to-day specialty.
- Addresses can lag the provider's actual practice location, especially when a dentist changes employers.
- NPPES does not deactivate a record automatically when a provider retires or dies; corrections require provider or family action.
If a NPPES-sourced field on a DentistGrid listing is wrong, please tell us through Report an incorrect listing, and update the source record at the NPPES provider portal.