Medical Codes MCP Server

@cyanheads/medical-codes-mcp-server Decode, search, validate, and crosswalk US medical codes - ICD-10-CM, ICD-10-PCS, HCPCS Level II, RxNorm - over a bundled offline index via MCP. STDIO or Streamable HTTP. Its 6 documented tools cover medcode, code, codes.

People who work with medcode, code and codes and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-24 · ★ 2 · #21 OF 75 MAINTAINED SCIENCE & HEALTH · VERIFIED 2026-09-30

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Medical Codes MCP Server

before you install - you'll need

Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL before connecting.

Claude Code

claude mcp add cyanheads-medical-codes-mcp-server --transport http https://medical-codes.caseyjhand.com/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "cyanheads-medical-codes-mcp-server": {
      "url": "https://medical-codes.caseyjhand.com/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://medical-codes.caseyjhand.com/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-09-30

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to medical-codes.caseyjhand.com

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license Apache-2.0 - declared in the repository

npm package @cyanheads/medical-codes-mcp-server - published under the repo owner's npm scope (@cyanheads)

registry namespace io.github.cyanheads is GitHub-verified and matches the repo owner

03 · What Medical Codes MCP Server can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 6 documented tools spanning medcode, code, codes, including medcode_get_code, medcode_search_codes, medcode_check_code, medcode_map_codes.

The 6 tools it gives your agent

Extracted from the project's README - what medical-codes-mcp-server lets an agent do.

medcode_get_code: - Decode 1–50 codes to their official descriptions. Auto-detects the system per code; partial-success found / notFound.
medcode_search_codes: - Full-text search over official descriptions - go from a clinical description to the code.
medcode_check_code: - Validate a code's existence, currency, and billability, with a whyNot for non-billable/terminated cases.
medcode_map_codes: - Crosswalk a code within its hierarchy (parents/children), a drug across RxNorm (name ↔ RXCUI, NDC ↔ RXCUI, RXCUI → ingredients/brands), or a drug to its RxClass
medcode_browse_hierarchy: - Walk a system's hierarchy for discovery without a search term.
medcode_list_systems: - List bundled systems with release identifiers, effective dates, and code counts, and the RxClass layer with each source's version (provenance).

Latest releases

v0.4.0 · 2026-09-24

RxClass drug-class crosswalks on medcode_map_codes · medcode_map_codes rxcui_to_classes and class_to_rxcuis: an RXCUI to its RxClass drug classes and a class ID to its direct member drugs, narrowed by a new classType…

v0.3.0 · 2026-09-24

RxNorm null fields and map_codes field contract · medcode_map_codes rejects limit/cursor on point directions and a non-RXNORM system on drug directions with field_not_applicable (#36) · RxNorm billable and…

v0.2.9 · 2026-09-19

mcp-ts-core 0.13.6, gated release PR · Argument rejections are JSON-RPC InvalidParams (-32602) with data.reason: "invalid_arguments" and a synthesized recovery hint, and content[] closes with a Recovery: … line and a…

04 · Who maintains Medical Codes MCP Server

medical-codes-mcp-server is maintained by cyanheads. We track 137 MCP servers from cyanheads - 131 actively maintained, 1,856 combined GitHub stars, oldest repo from Dec 2024. Full record: all servers from cyanheads.

05 · Facts

repository: github.com/cyanheads/medical-codes-mcp-server
category: science & health - ranked #21 of 75 actively-maintained science & health servers as of 2026-09-30.
release cadence: 10+ releases in the last 90 days (latest 2026-09-24)
registry: io.github.cyanheads/medical-codes-mcp-server (active, first published 2026-06-13 · 18 versions)
packages: npm:@cyanheads/medical-codes-mcp-server · npm:@cyanheads/medical-codes-mcp-server

06 · Medical Codes MCP Server FAQ

Is Medical Codes MCP Server still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-24 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

What can Medical Codes MCP Server do?

An agent gets 6 documented tools spanning medcode, code, codes, including medcode_get_code, medcode_search_codes, medcode_check_code, medcode_map_codes.

How do I install Medical Codes MCP Server?

Run `npx -y @cyanheads/medical-codes-mcp-server`. The README documents 2 environment variables (MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL) to set first. Set MCP_TRANSPORT_TYPE, MCP_LOG_LEVEL before connecting. You can also paste the ready-made client config above.

Does Medical Codes MCP Server require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-30; you can connect without credentials.

07 · Alternatives to Medical Codes MCP Server

Alternatives to Medical Codes MCP Server

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