GitHub
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A hosted API for searching and mapping medical codes
A hosted API for the OHDSI vocabularies behind OMOP, so health data teams can search, map and look up medical codes without downloading ATHENA files or running a vocabulary database. It covers 11M+ concepts in 120+ vocabularies, including SNOMED CT, ICD-10, LOINC and RxNorm, with lexical and semantic search, cross-vocabulary mapping, a FHIR terminology service and a FHIR-to-OMOP resolver, plus SDKs for Python, R and TypeScript and an MCP server for AI agents. The free plan gives 3,000 calls a month on the current release; Pro adds 50,000 calls, four vocabulary releases, full semantic search and bulk operations. Some vocabularies, such as SNOMED CT, carry their own license terms.
Free plan, no card required
Ongoing free tier published by the vendor. Limits vary by plan.
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