October 2026Dataset Refreshed: Expanded to 15.17M+ Unique Contacts
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What is NPPES?

Also called: CMS NPPES Registry, NPI Registry, NPPES data

NPPES is the CMS system that issues National Provider Identifiers and holds each provider's public NPI record. Its data can be searched in the NPI Registry, queried through an API, and downloaded as files that CMS refreshes every month.

By John Britton, VP of Marketing, MedicalProspects · Updated November 4, 2026 · Provider Identity & Data

Why it matters for healthcare sales and marketing

NPPES is the free, public, authoritative record of who is a healthcare provider in the United States. That makes it the starting point for almost every provider data project:

  • Validation. You can confirm that a contact is a real, enumerated provider and see their registered specialty and practice location.
  • Market sizing. Counting NPIs by taxonomy code and state gives a first estimate of how many providers you could reach.
  • Change detection. New and deactivated NPIs show who has entered or left practice.

What NPPES doesn't give you matters just as much: it has no marketing email addresses, job titles or decision-making roles, so it can't tell you who to contact at a hospital or how to reach a physician by email.

How it works

  • Enumeration. Providers apply for an NPI online. NPPES issues the number and stores the record: name, entity type, taxonomy codes, licenses, practice location, mailing address and phone.
  • Updates. Providers are required to report changes within 30 days. The records are self-reported, so some details, especially addresses and phone numbers, lag reality.
  • Public access. CMS publishes NPPES data in three ways: the NPI Registry website for one-off lookups, the NPI Registry API for programmatic queries, and downloadable files (a full replacement file each month, plus weekly update files and a deactivation file).
Flow diagram: providers apply to CMS NPPES, which issues NPIs and publishes data through the NPI Registry search, the NPI Registry API and downloadable monthly and weekly files. A panel lists what NPPES includes (names, NPI, taxonomy, licenses, addresses, phone) and what it does not (marketing emails, job titles, buying or technology data).
NPPES issues NPIs and publishes provider records three ways. It identifies providers but doesn't include marketing contact details.

Example

Illustrative scenario. A healthcare staffing firm wants to reach physicians early in their careers. Each week its data team loads the NPPES weekly update file and pulls newly issued Type 1 NPIs with physician taxonomy codes in its target states. NPPES supplies the names, specialties and practice locations. The firm then uses a verified contact source for email and phone, because the registry doesn't provide them.

Common mistakes

  • Treating NPPES as a contact database. It identifies providers but doesn't provide marketing email addresses.
  • Trusting every address. The practice location can be a billing office or an old address. Verify before you send direct mail or route a rep.
  • Using NPPES as license verification. NPPES lists license numbers, but the state licensing board is the source of truth for license status.
  • Downloading once. The file changes every week. A one-time pull goes stale as providers move, retire and register.

How MedicalProspects does it

MedicalProspects matches U.S. clinical records to NPPES at every monthly refresh, using the NPI, taxonomy codes and practice details, then adds verified business contact data that NPPES doesn't hold.

Related terms

  • National Provider Identifier (NPI)A National Provider Identifier (NPI) is a unique, permanent 10-digit number that identifies a U.S. healthcare provider or healthcare organization. CMS issues it through NPPES, and it identifies who the provider is, not their specialty or contact details.
  • NUCC Taxonomy CodeA NUCC taxonomy code is a 10-character code from the Health Care Provider Taxonomy code set that describes what kind of provider someone is and their area of specialization, for example 207RC0000X for Cardiovascular Disease.
  • HCP List (Healthcare Professional List)An HCP list is a database of individual healthcare professionals, such as physicians, nurse practitioners, pharmacists and nurses, with identifiers, specialties and contact details used for sales and marketing. Its counterpart, an HCO list, covers healthcare organizations.
  • Data EnrichmentData enrichment means filling in missing or outdated fields on records you already have, for example adding a provider's specialty, NPI, verified email or phone, by matching your records against a more complete, verified data source.
  • State Medical Board VerificationState medical board verification cross-checks provider profiles against official state licensing databases to confirm active practice status.

Put it to work

Sources

  1. NPPES, CMS
  2. NPPES NPI Registry, CMS
  3. NPI Registry API, CMS
  4. NPPES Downloadable File, CMS

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