# FHIRfly

> Healthcare reference data APIs for clinical coding, drug information, and provider lookup.

FHIRfly provides real-time access to NDC, NPI, RxNorm, LOINC, ICD-10, CVX, MVX, FDA Labels, SNOMED CT, UCUM, RxClass, HCPCS, MS-DRG, POS, J-Code/NDC Crosswalk, HCC, OPCS-4, dm+d, Connectivity, Claims Intelligence, and State Medicaid Agency data.

## Authentication

All API requests require an API key passed as `x-api-key` header or OAuth2 Bearer token.

Free tier: 10,000 requests/month, no credit card required.
Sign up: https://fhirfly.io/dashboard

## Quick Start (Node.js SDK)

npm install @fhirfly-io/terminology

import { Fhirfly } from "@fhirfly-io/terminology";
const client = new Fhirfly({ apiKey: "ffly_your_key" });
const med = await client.ndc.lookup("0069-0151-01");

## Quick Start (REST API)

curl -H "x-api-key: YOUR_KEY" https://api.fhirfly.io/v1/ndc/0069-0151-01

## Quick Start (MCP for Claude Desktop)

npx @fhirfly-io/mcp-server

## Resources

- OpenAPI spec: https://fhirfly.io/openapi.yaml
- SDK docs: https://fhirfly.io/docs/getting-started/quickstart
- API reference: https://fhirfly.io/docs/api-reference
- npm: https://www.npmjs.com/package/@fhirfly-io/terminology
- GitHub: https://github.com/FHIRfly-io