Medical Terminologies MCP

Community MCP server that exposes the major global medical terminologies — ICD-11, SNOMED CT, LOINC, RxNorm, MeSH, and ATC — through one install, with cross-terminology search and mapping.

   
Type MCP server
Supplier Sidney Bissoli (open source)
Availability GA — published to npm as medical-terminologies-mcp
Pricing Free / OSS (MIT). WHO ICD-11 API credentials required for ICD-11 tools; SNOMED CT needs an IHTSDO/SNOMED International license for production use
Capabilities Read-only — terminology lookup, hierarchy traversal, and cross-mapping
Verified works · 2026-07-20
Security cleared · 2026-07-20 — provenance matches supplier, MIT, maintained, read-only

How to install

This server runs over stdio, so Claude Code / Claude Desktop launch the process themselves — there is no long-lived service to keep running. For ICD-11 tools, register first for free WHO ICD API credentials at icd.who.int/icdapi; the LOINC, RxNorm, MeSH, and ATC tools need no auth.

  • Claude Code — register the npm package directly (npx fetches it; replace the WHO placeholders with your credentials):

    claude mcp add-json medical-terminologies '{"command":"npx","args":["-y","medical-terminologies-mcp"],"env":{"WHO_CLIENT_ID":"your-who-client-id","WHO_CLIENT_SECRET":"your-who-client-secret"}}'

  • Claude Desktop — add to claude_desktop_config.json:

    {
  "mcpServers": {
    "medical-terminologies": {
      "command": "npx",
      "args": ["-y", "medical-terminologies-mcp"],
      "env": {
        "WHO_CLIENT_ID": "your-who-client-id",
        "WHO_CLIENT_SECRET": "your-who-client-secret"
      }
    }
  }
}

    Restart Claude Desktop after editing the config.

What it does

Exposes 31 tools by default (37 with SNOMED CT enabled) across the terminologies:

  • ICD-11 — search, lookup, hierarchy, chapters, post-coordination.
  • LOINC — search, details, answers, panels.
  • RxNorm — search, concept, ingredients, drug classes, NDC.
  • MeSH — search, descriptor, tree, qualifiers.
  • SNOMED CT (optional) — search, concept, hierarchy, descriptions, ECL expression queries.
  • ATC — classify, lookup, members.

Includes built-in caching, rate limiting, and cross-terminology search/mapping.

Primary use cases: Map clinical terms across coding systems, resolve drug/lab/diagnosis codes, build terminology-validation steps for clinical documentation and trial-eligibility workflows.

Notes

Complements the single-terminology Anthropic icd-10-codes connector: this server is broader (ICD-11 rather than ICD-10-CM/PCS, plus SNOMED/LOINC/RxNorm/MeSH/ATC) but is community-maintained and read-only. SNOMED CT content is reference-only unless you hold an IHTSDO license; RxNorm, LOINC, MeSH, and ATC are freely usable. Also installable via Smithery (npx -y smithery mcp add sidneybissoli/medical-terminologies-mcp). stdio transport.

Sources

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