OMOPHub - Medical Terminology API for SNOMED, ICD-10, LOINC & RxNorm

# OMOPHub > Managed API for OHDSI/OMOP medical vocabularies. Search, map, and resolve > 11M+ concepts across 130+ vocabularies (SNOMED CT, ICD-10-CM, LOINC, RxNorm, > HPO, and more) without hosting a vocabulary database. ## Access surfaces - REST API: https://api.omophub.com/v1 - FHIR Terminology Service: https://fhir.omophub.com/fhir/{r4|r4b|r5|r6}/ - MCP Server (hosted): https://mcp.omophub.com ## SDKs - Python: `pip install omophub` - R: `install.packages("omophub")` - Node/TypeScript: `npm install @omophub/omophub-node` - MCP: `npx -y @omophub/omophub-mcp` ## Key capabilities - Lexical, semantic (neural embedding), and hybrid concept search - Bulk search - up to 50 queries per request - Cross-vocabulary mappings and hierarchy traversal - FHIR Resolver: Coding/CodeableConcept → OMOP standard concept + CDM target table in one call. HL7 FHIR-to-OMOP IG conformant. - FHIR R4/R4B/R5/R6 terminology service: $lookup, $validate-code, $translate, $expand, $subsumes, $find-matches, $closure, plus $diff extension - 11 MCP tools for Claude, Cursor, VS Code, Windsurf - PHOEBE concept recommendations, versioned ConceptSets, ATHENA version pinning ## Common tasks - Find a concept by name or code - REST `/v1/concepts/search` - Resolve ICD-10/SNOMED/LOINC source code to OMOP standard concept - mappings - Traverse hierarchy (ancestors/descendants) - relationship endpoints - Build and version a ConceptSet - Semantic/neural search over concepts - Resolve a FHIR Coding/CodeableConcept to OMOP - FHIR Resolver - Use from Claude/Cursor/VS Code - hosted MCP server ## Documentation - [Full docs index](https://docs.omophub.com/llms.txt) - [Complete documentation](https://docs.omophub.com/llms-full.txt) - [Agent guide](https://docs.omophub.com/skill.md) - preferred workflow (REST vs SDK vs MCP), decision rules, canonical terminology, common tasks, gotchas - [Quickstart](https://docs.omophub.com/quickstart) - [API reference](https://docs.omophub.com/api-reference) ## Pag