Validar Codigo Medico MCP Server

validar-codigo-medico

Remote MCP server (Cloudflare Workers) with one tool that validates medical codes against real data:

• validate_medical_code — system: "icd10" does a real lookup against the official billable ICD-10-CM code catalog (FY2026, NCHS/CDC, public domain as a work of the U.S. government) and returns the official short description. system: "cpt" validates the real structure of a CPT code (Category I: 5 digits; Category II: 4 digits + F; Category III: 4 digits + T) and estimates its area by public numeric range — it doesn't include per-code descriptions, because the CPT catalog is owned by the AMA and requires a paid license (it can't be redistributed).

No database, no persistent state between calls: each call builds a fresh McpServer (see createServer() in src/index.ts). The ICD-10-CM catalog (~6MB, 74,719 codes) is bundled into the Worker itself as static data (src/tools/data/icd10cm.ts) and parsed once per isolate into an in-memory Map — see src/tools/codigoMedico.ts.

Why CPT has no descriptions

The CPT (Current Procedural Terminology) description catalog is owned by the American Medical Association and requires a paid license to redistribute its content — unlike ICD-10-CM, which is a work of the U.S. government and therefore public domain. That's why this tool validates a CPT code's real format (regex + numeric range, publicly available information about the code's structure) but doesn't offer the procedure's description: that requires an AMA-licensed codebook.

Billing (x402)

Charges per call via x402 — real USDC payment on Base mainnet, against the Coinbase Developer Platform (CDP) facilitator. The payment travels inside the MCP JSON-RPC itself (_meta), not as an HTTP header; see src/payments.ts.

An unpaid tools/call returns isError: true with the accepts (network, amount, payTo) the client needs to pay and retry — not an unexplained exception.

Structure

src/
  index.ts             # registers the tool in the McpServer and exposes the MCP HTTP handler
  payments.ts          # x402 billing on Base mainnet via the CDP facilitator
  tools/
    codigoMedico.ts       # pure logic for validate_medical_code (testable without Workers)
    codigoMedico.test.ts
    data/
      icd10cm.ts          # bundled FY2026 ICD-10-CM catalog (generated, do not edit by hand)
scripts/
  dev-node.ts           # dev server that runs the handler in plain Node, no wrangler
  gen-icd10-data.mjs    # regenerates tools/data/icd10cm.ts from a new CMS/NCHS order file

Updating the ICD-10-CM catalog

When NCHS publishes a new version (new fiscal year or addenda):

1. Download the "Code Descriptions" zip from https://ftp.cdc.gov/pub/health_statistics/nchs/publications/ICD10CM/<YEAR>/.
2. Unzip it and locate icd10cm-codes-<YEAR>.txt.
3. node scripts/gen-icd10-data.mjs <path-to-txt> src/tools/data/icd10cm.ts.

Running it locally

⚠️ Note on wrangler dev: the real Cloudflare Workers runtime (workerd) requires macOS 13.5+. If your Mac has an older version, wrangler dev (and npm run dev) will fail. This project includes a plain-Node shim that runs the exact same fetch() handler without needing workerd.

1. Install dependencies

npm install

2. Run the unit tests

npm test

3a. If your wrangler dev works (macOS 13.5+, Linux, Windows)

npm run dev

3b. If wrangler dev fails because of the macOS version

npm run dev:node

Starts at http://localhost:8787/mcp, reading CDP credentials from ~/.mcp-tools-factory-credentials.env (shared across all tools in this factory).

4. Test with curl

# 1) initialize
curl -s -X POST http://localhost:8787/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"curl-test","version":"0.0.1"}}}'

# 2) tools/list
curl -s -X POST http://localhost:8787/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}'

# 3) tools/call — validate_medical_code (ICD-10-CM)
curl -s -X POST http://localhost:8787/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"validate_medical_code","arguments":{"system":"icd10","codes":["A00.0","Z21","does-not-exist"]}}}'

Responses come as Server-Sent Events (event: message + data: {...}); the data: line is the usual JSON-RPC response.

Deploy and listings

Deployed at https://validar-codigo-medico.encodari.workers.dev/mcp (Cloudflare Workers). Published on the official MCP registry, Smithery, mcp.so, and with an open PR to awesome-mcp-servers.

What it doesn't do (yet)

• Doesn't include per-code CPT descriptions (see "Why CPT has no descriptions" above).
• Charges on Base mainnet with real money. To switch back to testnet (Base Sepolia, eip155:84532) during development, change NETWORK in src/payments.ts.
• No database or persistent state between calls (beyond the billing config and the ICD-10-CM catalog Map, cached in memory per isolate).
• Not medical or billing advice: this is a structural/catalog validation, not a substitute for a certified professional coder.