Who it is for
Credentialing staff, claims teams and healthcare data engineers.
AI Connectors · Healthcare & Life Sciences
NPI Registry
Look up and validate US healthcare provider NPI numbers
Overview
What NPI Registry does
Every HIPAA covered healthcare provider in the United States carries a National Provider Identifier, and the NPPES registry maintained by CMS is the public record of them. This Anthropic built connector reaches it without credentials. One call checks an NPI's format and Luhn check digit locally with no network request, which catches transcription errors before a lookup is wasted on them. The second retrieves full provider details for a valid number. The third searches the registry by name, location, specialty or organisation when the number is not known. Between them they cover the standard verification path for a provider record.
Tool surface
Three tools with a clear order of use: npi_validate is local arithmetic on the number itself, npi_lookup resolves a known identifier and npi_search finds one when it is not known.
Availability
Where NPI Registry is listed
NPI Registry is listed in the Claude connectors directory only. Anthropic has no app under the same domain in the ChatGPT directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
The MCP server behind a Claude connector is usually the same server a ChatGPT app would need, so the absence is a distribution decision rather than a technical one.
Claude listing
In the Claude connectors directory
NPI Registry publishes 3 tools to Claude, a deliberately narrow surface; only 11.3% of the 1,253 Claude-listed connectors expose fewer.
The median Claude-listed connector filed under Healthcare & Life Sciences publishes 6, so this one sits 3 tools below its bucket's median, 38th of 51.
It falls in the 1-3 tools band, which holds 16.4% of the Claude directory.
Measured against the live endpoint
A direct call to the endpoint returned 3 tools, matching the 3 the listing publishes. Probed 2026-08-07.
Tools the server actually returns
npi_validatenpi_lookupnpi_search
NPI Registry publishes a remote MCP endpoint. Claude connects to it over HTTP; there is nothing to install locally.
Every connector in the Claude directory is remote, all 1,253 of them, so transport is not a differentiator there.
- Publisher
- Anthropic
- Verification
- Built by Anthropic (0.7% of the Claude directory)
- Filed under
- Health & Life Sciences
- Endpoint
-
https://hcls.mcp.claude.com/npi_registry/mcp - Documentation
- Publisher setup docs
- Published tools
- 3 · 1-3 tools band
- Depth rank in Healthcare & Life Sciences
- 38 of 51
- Snapshot
- August 2026
NPI Registry is one of only 9 connectors in the entire Claude directory built by Anthropic itself, 0.7% of the 1,253 listings. Everything else is published by a third party.
In the publisher's words
How Anthropic describes it
The NPI Registry Connector gives Claude access to the US National Provider Identifier (NPI) Registry, containing information about all HIPAA-covered healthcare providers in the United States.
Quoted from the connector's own Claude directory listing as captured in August 2026. Node8 did not write it and does not vouch for it.
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This is an independent catalogue entry compiled by Node8 from NPI Registry's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Anthropic, and inclusion here is not an endorsement.
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