NPPES API

Overview

Measurement Record

What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.

Request

GET https://npiregistry.cms.hhs.gov/api/?number=1234567890&version=2.1

Result

HTTP 200 · application/json · 31 bytes

Response time

206 ms (median of 3) · fastest 198 ms

Transport

TLSv1.3 · TLS_AES_128_GCM_SHA256 · certificate issued by Amazon

Browser CORS

No Access-Control-Allow-Origin header — call it from a server, not the browser

Recorded

2026-08-10

Fields Returned

Top-level fields present in the response we captured, with the type and value we actually received.

Captured Response

Captured from a real request to https://npiregistry.cms.hhs.gov/api/?number=1234567890&version=2.1 on 2026-08-10. Long arrays and nested objects are truncated to keep the shape readable.

{
  "result_count": 0,
  "results": []
}

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

const url = "https://npiregistry.cms.hhs.gov/api/?number=1234567890&version=2.1";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

import requests

url = "https://npiregistry.cms.hhs.gov/api/?number=1234567890&version=2.1"
headers = {}

response = requests.get(url, headers=headers, timeout=30)
response.raise_for_status()
data = response.json()
print(data)

curl "https://npiregistry.cms.hhs.gov/api/?number=1234567890&version=2.1"

What Can You Build?

// Fetch health data
const response = await fetch(`https://npiregistry.cms.hhs.gov/registry/help-api`);
const data = await response.json();
console.log('Health data:', data);
const info = data.data || data.results || data;
console.log('Details:', JSON.stringify(info, null, 2));

// Get health metrics and statistics
const response = await fetch(`https://npiregistry.cms.hhs.gov/registry/help-api`);
const data = await response.json();
const metrics = data.metrics || data.stats || data;
document.getElementById('health-stats').innerHTML =
  `<pre>${JSON.stringify(metrics, null, 2)}</pre>`;
console.log('Health metrics loaded from NPPES');

// Search health-related information
const query = 'nutrition';
const response = await fetch(`https://npiregistry.cms.hhs.gov/registry/help-api`);
const data = await response.json();
const results = data.results || data.data || [];
results.slice(0, 5).forEach(item => {
  console.log(`🏥 ${item.name || item.title}: ${item.description || ''}`);
});

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.