NPILayer API

Quickstart

1. Create an account Sign up at npilayer.com/signup to get an API key. The free plan includes 1,000 requests per month.
2. Authenticate your requests Pass your API key in the Authorization header on every request.
3. Make your first request Look up a provider by NPI number:

curl \
  -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.npilayer.com/v1/providers/1003000126"

$ch = curl_init('https://api.npilayer.com/v1/providers/1003000126');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['Authorization: Bearer YOUR_API_KEY'],
]);
$response = json_decode(curl_exec($ch), true);
curl_close($ch);

echo $response['data']['name']['last']; // Smith

const response = await fetch(
  'https://api.npilayer.com/v1/providers/1003000126',
  { headers: { 'Authorization': 'Bearer YOUR_API_KEY' } }
);
const { data } = await response.json();
console.log(data.name.last); // Smith

import requests

r = requests.get(
    'https://api.npilayer.com/v1/providers/1003000126',
    headers={'Authorization': 'Bearer YOUR_API_KEY'}
)
provider = r.json()['data']
print(provider['name']['last'])  # Smith

Available endpoints

Data source

All provider data comes from the CMS NPPES (National Plan and Provider Enumeration System) registry, updated monthly with weekly incremental additions. NPILayer maintains its own local database and does not proxy CMS API calls at request time.

An NPI record confirms that CMS has enumerated a provider with that identifier. It does not prove current licensure, network participation, or active practice status. Display the following disclaimer where appropriate: