npi-providers-mcp-server

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  <h1>@cyanheads/npi-providers-mcp-server</h1>
  <p><b>Look up US healthcare providers in the NPPES NPI registry and resolve NUCC specialty codes via MCP. STDIO or Streamable HTTP.</b>
  <div>3 Tools • 2 Resources</div>
  </p>
</div>

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**Public Hosted Server:** [https://npi-providers.caseyjhand.com/mcp](https://npi-providers.caseyjhand.com/mcp)

</div>

---

## Tools

Three tools covering the provider directory — search the registry, decode an NPI to its full record, and resolve plain-language specialties through the bundled taxonomy:

| Tool | Description |
|:---|:---|
| `npi_search_providers` | Search the NPPES registry by name, organization, location, provider type, and specialty. Plain-language specialties resolve through the bundled NUCC taxonomy before searching. |
| `npi_get_provider` | Fetch the complete NPPES record for up to 10 NPIs — taxonomies, addresses, credentials, identifiers, endpoints, and status. |
| `npi_lookup_taxonomy` | Resolve, fetch, or browse the NUCC Healthcare Provider Taxonomy — fully offline. |

### `npi_search_providers`

Search the registry for individual practitioners and organizations, with specialty resolution and honest pagination disclosure.

- Search by `name_search` shortcut, explicit `first_name` / `last_name`, `organization_name`, `city` / `state` / `postal_code`, and `provider_type` (`individual` / `organization`)
- Plain-language `specialty` (e.g. "cardiologist") resolves through the bundled NUCC taxonomy to the registry's exact descriptions before searching; the resolved taxonomy is echoed back so you can see what was actually searched
- `taxonomy_description` escape hatch for callers who already hold an exact NUCC description (mutually exclusive with `specialty`)
- Trailing-wildcard (`*`) name matching, with the registry's ≥2-leading-character rule documented inline
- Discloses that the returned count is the page size — never a grand total — and that only the first 1200 matches are reachable, steering broad queries toward narrower filters

---

### `npi_get_provider`

Decode one or more NPIs into fully populated provider profiles — the tool to turn an NPI from a claim, prescription, or another health data source into a known provider.

- Batch fetch up to 10 NPIs per call; the 10-digit format is validated before any API call
- Returns every taxonomy (with its primary flag, license number and state), all practice and mailing addresses, credential, sex, sole-proprietor flag, enumeration and last-updated dates, secondary identifiers (Medicaid, etc.), and FHIR/Direct endpoints
- Partial-success reporting — well-formed NPIs with no registry record (deactivated or never enumerated) land in `notFound` rather than failing the whole call

---

### `npi_lookup_taxonomy`

Resolve and browse the NUCC Healthcare Provider Taxonomy — the specialty code set NPPES uses — fully offline from the bundled code set.

- `resolve` — turn a plain-language specialty into matching taxonomy codes and canonical descriptions (the value the search tools filter on)
- `get` — return the full entry for an exact taxonomy code
- `browse` — walk the hierarchy (grouping → classification → specialization), filterable by grouping and by NPI section (Individual/NPI-1 vs Non-Individual/NPI-2)

## Resources and prompts

| Type | Name | Description |
|:---|:---|:---|
| Resource | `npi://provider/{npi}` | A single provider's full decoded record by NPI — the resource twin of `npi_get_provider`. |
| Resource | `npi://taxonomy/{code}` | A single NUCC taxonomy entry by code — the resource twin of `npi_lookup_taxonomy` mode `get`. |

All resource data is also reachable via tools. The resources are convenience twins for resource-capable clients; tool-only clients lose nothing.

## Features

Built on [`@cyanheads/mcp-ts-core`](https://www.npmjs.com/package/@cyanheads/mcp-ts-core):

- Declarative tool and resource definitions — single file per primitive, framework handles registration and validation
- Unified error handling — handlers throw, framework catches, classifies, and formats
- Pluggable auth: `none`, `jwt`, `oauth`
- Swappable storage backends: `in-memory`, `filesystem`, `Supabase`, `Cloudflare KV/R2/D1`
- Structured logging with optional OpenTelemetry tracing
- STDIO and Streamable HTTP transports

NPI/NPPES-specific:

- **Keyless** — runs against the public CMS NPPES NPI Registry API (v2.1) with no API key or account
- **Bundled NUCC taxonomy** — the 879-code Healthcare Provider Taxonomy (v25.0) ships in the image and loads into an in-memory index at startup, so specialty resolution and code lookups work fully offline with no second upstream
- Specialty resolution turns a vague term ("heart doctor") into the precise taxonomy description the registry filters on, and echoes the match back for the agent to verify
- Detects the registry's quirk of returning HTTP 200 with an `Errors[]` body on validation failure and maps it to typed, recoverable error reasons

Agent-friendly output:

- Provenance on search — the resolved taxonomy and the exact `taxonomy_description` sent to the registry are echoed back, so agents can see what was actually searched and re-run with a different code
- Honest pagination — the returned count is disclosed as the page size, never a fabricated grand total, with the 1200-match reachable ceiling surfaced when a broad query is capped
- Graceful partial failure — `npi_get_provider` returns per-NPI `found` / `notFound` rows instead of failing the whole batch when some NPIs are deactivated or never enumerated

## Getting started

### Public Hosted Instance

A public instance is available at `https://npi-providers.caseyjhand.com/mcp` — no installation required. Point any MCP client at it via Streamable HTTP, with this client config:

```json
{
  "mcpServers": {
    "npi-providers-mcp-server": {
      "type": "streamable-http",
      "url": "https://npi-providers.caseyjhand.com/mcp"
    }
  }
}
```

### Self-hosted / local install

Add the following to your MCP client configuration file. No API key is required — the upstream NPPES registry is keyless.

```json
{
  "mcpServers": {
    "npi-providers-mcp-server": {
      "type": "stdio",
      "command": "bunx",
      "args": ["@cyanheads/npi-providers-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}
```

Or with npx (no Bun required):

```json
{
  "mcpServers": {
    "npi-providers-mcp-server": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@cyanheads/npi-providers-mcp-server@latest"],
      "env": {
        "MCP_TRANSPORT_TYPE": "stdio",
        "MCP_LOG_LEVEL": "info"
      }
    }
  }
}
```

Or with Docker:

```json
{
  "mcpServers": {
    "npi-providers-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": ["run", "-i", "--rm", "-e", "MCP_TRANSPORT_TYPE=stdio", "ghcr.io/cyanheads/npi-providers-mcp-server:latest"]
    }
  }
}
```

For Streamable HTTP, set the transport and start the server:

```sh
MCP_TRANSPORT_TYPE=http MCP_HTTP_PORT=3010 bun run start:http
# Server listens at http://localhost:3010/mcp
```

### Prerequisites

- [Bun v1.3.2](https://bun.sh/) or higher (or Node.js v24+).
- No API key — the NPPES NPI Registry API is public and keyless. The NUCC taxonomy is bundled, so there is no second data source to provision.

### Installation

1. **Clone the repository:**

```sh
git clone https://github.com/cyanheads/npi-providers-mcp-server.git
```

2. **Navigate into the directory:**

```sh
cd npi-providers-mcp-server
```

3. **Install dependencies:**

```sh
bun install
```

4. **Configure environment (optional):**

```sh
cp .env.example .env
# edit .env only if you need to override the NPPES base URL or timeout
```

## Configuration

No required variables — the server runs out of the box against the keyless NPPES registry. All variables below are optional overrides.

| Variable | Description | Default |