NPPES API

Beginner's Pick Health / No Auth Required Beginner HTTPS

Free to Use Varies (check documentation)

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Measured Score TESTED 2026-07-23

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Overview

The NPPES NPI Registry API lets you look up US healthcare providers by their National Provider Identifier (NPI) number or by name and specialty. It is completely free with no authentication required and returns detailed provider information including address, taxonomy, and contact details. This is useful for building healthcare directories or verifying provider credentials.

Beginner Tip

Search by a provider's last name and state using the number and enumeration_type parameters to narrow results — the API can return up to 200 records per request.

Available Data

country name and code

population

capital city

region and subregion

flag image URL

vehicle make and model

Example Response

JSON Response

{
  "name": "Japan",
  "capital": "Tokyo",
  "population": 125800000,
  "region": "Asia",
  "languages": [
    "Japanese"
  ],
  "flag": "https://flagcdn.com/jp.svg",
  "currencies": [
    {
      "code": "JPY",
      "name": "Japanese yen"
    }
  ]
}

Field Reference

result_count Total number of providers matching the search criteria.

results Array of matching provider records.

number The 10-digit National Provider Identifier (NPI) for the provider.

enumeration_type Provider type: NPI-1 for individuals, NPI-2 for organizations.

taxonomies List of provider specialty taxonomies with codes and descriptions.

addresses Mailing and practice location addresses for the provider.

Implementation Example

Request

const url = "https://npiregistry.cms.hhs.gov/registry/help-api";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);