# icdwise
**Verified ICD-10-CM code lookup & validation for AI agents — official descriptions, not guesses.**
*Verified, trustworthy data tools for AI agents. "Qiniso" means "truth" in Zulu.*
[Website](https://qinisolabs.github.io/icdwise/) · [npm](https://www.npmjs.com/package/icdwise) · [MCP endpoint](https://icdwise.qinisolabs.workers.dev/mcp) · [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers?search=icdwise)
---
Ask an LLM what an ICD-10-CM code means and it will answer confidently — and often **wrongly**: the wrong laterality, the wrong severity, the wrong condition entirely, and it will happily invent a description for a code that doesn't exist. **icdwise** looks the code up in the official U.S. ICD-10-CM code set and returns the real description — or an honest *"not found"* instead of a guess.
> Asked to describe real ICD-10-CM codes, a frontier model with no tools was **wrong ~38% of the time** — e.g. it called `H40.1131` *"severe stage, right eye"* (it's *mild, bilateral*) and `T63.011A` *"ingested mushrooms"* (it's *rattlesnake venom*) — and it **fabricated a description for a code that doesn't exist**. icdwise: the official text, or "not found." Never a guess.
## Add it to Claude
Settings → Connectors → **Add custom connector**, and paste — no login, no key:
```
https://icdwise.qinisolabs.workers.dev/mcp
```
Stateless, reads no user data, requires no secrets. Prefer to run it locally over stdio? Add `{ "command": "npx", "args": ["-y", "icdwise"] }` under `mcpServers` in your client config.
## Use it as a library
```bash
npm i icdwise
```
```ts
import { lookupIcd10, validateIcd10, searchIcd10 } from "icdwise";
lookupIcd10("E11.9").description; // "Type 2 diabetes mellitus without complications"
lookupIcd10("H40.1131").description; // "Primary open-angle glaucoma, bilateral, mild stage"
validateIcd10("E11.99").valid; // false — well-formed but not a real code
searchIcd10("generalized anxiety"); // → [{ code: "F41.1", description: "Generalized anxiety disorder" }, ...]
```
Codes are accepted with or without the dot (`E11.9` or `E119`). A well-formed code that isn't in the official set returns `found: false` with a clear note — it never invents a description.
## Tools — 3
| Tool | What it answers |
| --- | --- |
| **lookup_icd10** | The official description of a code (+ canonical form and 3-char category) |
| **validate_icd10** | Is this a real ICD-10-CM code? (well-formed *and* in the official set) |
| **search_icd10** | Reverse lookup — find the code(s) for a condition by keywords |
## Data
ICD-10-CM is U.S. **public-domain** data (NCHS/CMS). The full code set (~74,000 codes) is bundled and generated from the official CMS release via `npm run build-data