How This NPI Lookup Tool Works

Technical methodology and data accuracy information for transparency.

The NPPES Public API

This tool is powered by the CMS NPPES Public API — the same federal government API that is used by the official NPI registry search at npiregistry.cms.hhs.gov. The API endpoint is https://npiregistry.cms.hhs.gov/api/?version=2.1. It is a public REST API maintained by the Centers for Medicare & Medicaid Services (CMS) that requires no API key and is freely available to any application or user. When you submit a search, your browser sends a request directly to this API and displays the results — we do not act as an intermediary or modify the data in any way.

Data Accuracy and Freshness

The NPPES database is updated by CMS daily. Healthcare providers are legally required to update their NPPES record within 30 days of any change in their information. This means address changes, phone number updates, new specialty additions, and status changes are typically reflected in search results within 30 days of the change. For critical credentialing verifications, always cross-check results with the official NPPES website at npiregistry.cms.hhs.gov. A timestamp showing the provider's last update date is included in each search result to help assess data freshness.

Search Architecture

Searches are performed client-side — your browser communicates directly with the CMS NPPES API. This architecture means your search queries never pass through our servers and are not logged by us. The API supports searches by NPI number (exact match), provider first and last name (with wildcard support), organization name (with wildcard support), state, city, and taxonomy description. Results are paginated at 10 per page, with pagination controls to navigate through larger result sets.

Wildcard Search Behavior

Name-based searches automatically append a wildcard (*) to search terms, meaning a search for "Smith" will return all providers whose last name begins with "Smith" (Smith, Smithson, Smithwick, etc.). This is standard NPPES API behavior. For more precise results, enter both first and last name, and add a state filter. For NPI number searches, an exact 10-digit match is required — partial NPI searches are not supported by the NPPES API.

What We Don't Do

We do not store search queries or results. We do not combine NPPES data with other data sources to create profiles. We do not sell provider data. We do not modify NPPES data in any way — results are displayed exactly as returned by the CMS API. We do not claim to be an official government service. We do not guarantee 100% accuracy — providers are responsible for maintaining their own NPPES records, and some records may be outdated.

Performance

This tool is built as a static website with no server-side processing. All API calls are made from your browser directly to CMS. This architecture provides the fastest possible user experience while maintaining complete data accuracy. The tool is designed to achieve 100/100 Google PageSpeed scores on both mobile and desktop, ensuring fast load times regardless of your connection speed or device.