# OMOPHub.com API

## Docs

- [Docs for Agents](https://docs.omophub.com/ai/docs-for-agents.md): Machine-readable llms.txt, llms-full.txt, and raw Markdown endpoints that give AI agents structured OMOPHub documentation and LLM context.
- [AI and LLM integration with OMOP vocabularies](https://docs.omophub.com/ai/integration-guide.md): Pair LLMs with OMOPHub vocabulary lookups to eliminate hallucinated medical codes, ground clinical chatbots, and verify every OMOP concept ID.
- [MCP Server HTTP and Docker deployment guide](https://docs.omophub.com/ai/mcp-docker.md): Deploy the OMOPHub MCP Server as an HTTP service or Docker container for centralized, multi-agent access to OMOP medical vocabularies.
- [Hosted MCP Server for OMOP vocabularies](https://docs.omophub.com/ai/mcp-hosted.md): Connect AI clients to the OMOPHub MCP Server hosted at mcp.omophub.com with no installation, giving agents instant access to OMOP vocabularies.
- [OMOPHub MCP Server for Claude, Cursor, and VS Code](https://docs.omophub.com/ai/mcp-server.md): Install the OMOPHub MCP Server to give Claude, Cursor, VS Code, and other AI clients direct access to OMOP medical vocabularies and concept search.
- [MCP tools reference for OMOPHub vocabularies](https://docs.omophub.com/ai/mcp-tools.md): Complete parameter reference for all 11 OMOPHub MCP tools: search, mapping, hierarchy, FHIR resolve, and vocabulary lookup for AI clients.
- [AI agent onboarding for OMOP medical vocabularies](https://docs.omophub.com/ai/onboarding.md): Give AI agents grounded access to 10M+ OMOP medical concepts with zero hallucination risk - search, map, and navigate vocabularies from any client.
- [Batch Concepts](https://docs.omophub.com/api-reference/concepts/batch-concepts.md)
- [Batch Hierarchy Queries](https://docs.omophub.com/api-reference/concepts/batch-hierarchy-queries.md): Run multiple OMOP concept hierarchy lookups in a single batched request to efficiently retrieve ancestors and descendants for bulk ETL workflows.
- [Batch Relationship Queries](https://docs.omophub.com/api-reference/concepts/batch-relationship-queries.md): Run multiple OMOP concept relationship queries in a single batched request for efficient bulk processing of mappings and vocabulary crosswalks.
- [Check Concept Relations](https://docs.omophub.com/api-reference/concepts/check-concept-relations.md): Check whether an OMOP concept has any relationships without loading the full relationship payload - a lightweight existence check for ETL validation.
- [Get Concept](https://docs.omophub.com/api-reference/concepts/get-concept.md)
- [Get Concept by Code](https://docs.omophub.com/api-reference/concepts/get-concept-by-code.md)
- [Get Concept Level](https://docs.omophub.com/api-reference/concepts/get-concept-level.md): Get the hierarchical level and depth of an OMOP concept within its vocabulary tree for quick classification and hierarchy-aware filtering.
- [Get Concept Relationships](https://docs.omophub.com/api-reference/concepts/get-concept-relationships.md): Retrieve all OMOP concept relationships - including "Maps to", "Is a", and vocabulary-specific links - to traverse concept networks in clinical data.
- [Get Trending Concepts](https://docs.omophub.com/api-reference/concepts/get-concept-trending.md): Retrieve trending OMOP concepts ranked by search frequency and usage patterns to surface popular medical terminology across OMOPHub clients.
- [Get Related Concepts](https://docs.omophub.com/api-reference/concepts/get-related-concepts.md): Find OMOP concepts related through relationship analysis - ingredients, routes, brand names, and hierarchical links - for concept set expansion.
- [Get Relationship Options](https://docs.omophub.com/api-reference/concepts/get-relationship-options.md): Get the list of available relationship types for a specific OMOP concept so you can filter, paginate, or traverse only the links you care about.
- [Recommended Concepts](https://docs.omophub.com/api-reference/concepts/recommended-concepts.md)
- [Suggest Concepts](https://docs.omophub.com/api-reference/concepts/suggest-concepts.md)
- [Traverse Relationships](https://docs.omophub.com/api-reference/concepts/traverse-relationships.md): Traverse OMOP relationship networks across vocabularies to discover connected concepts - RxNorm ingredients, SNOMED parents, ICD mappings, and more.
- [Get Concept Classes](https://docs.omophub.com/api-reference/domains/get-concept-classes.md): Retrieve all OMOP concept classes that categorize medical concepts - Clinical Finding, Ingredient, Procedure, and the complete OHDSI classification set.
- [Get Domain Concepts](https://docs.omophub.com/api-reference/domains/get-domain-concepts.md): Retrieve all OMOP concepts within a specific domain - Condition, Drug, Measurement, Procedure - with pagination for building domain-scoped concept sets.
- [Get Domain Statistics](https://docs.omophub.com/api-reference/domains/get-domain-statistics.md): Get statistical overview for an OMOP domain including concept counts, standard concept coverage, and vocabulary distribution for capacity planning.
- [Get Domains](https://docs.omophub.com/api-reference/domains/get-domains.md): Retrieve all OMOP domains - Condition, Drug, Measurement, Observation, Procedure - that group medical concepts into high-level semantic categories.
- [API error codes and troubleshooting reference](https://docs.omophub.com/api-reference/errors.md): Full reference of OMOPHub API error codes and HTTP statuses with guidance on how to troubleshoot 4xx and 5xx responses in your integration.
- [FHIR Batch Bundle terminology operations](https://docs.omophub.com/api-reference/fhir-terminology/batch.md): Execute multiple FHIR terminology operations - $lookup, $validate-code, $translate, $expand - in a single FHIR Bundle request for efficient processing.
- [FHIR ConceptMap/$closure for subsumption tables](https://docs.omophub.com/api-reference/fhir-terminology/closure.md): Compute and maintain FHIR subsumption closure tables across OMOP concepts - track ancestor/descendant links between vocabulary version updates.
- [FHIR CodeSystem read for OMOP vocabularies](https://docs.omophub.com/api-reference/fhir-terminology/codesystem-read.md): Fetch a specific FHIR CodeSystem resource by ID - either a per-vocabulary stub (SNOMED, LOINC, RxNorm) or the unified OMOP omnibus CodeSystem.
- [FHIR CodeSystem search and URI resolution](https://docs.omophub.com/api-reference/fhir-terminology/codesystem-search.md): Discover which FHIR CodeSystems OMOPHub serves and resolve canonical system URIs to instance IDs for SNOMED, LOINC, RxNorm, and ICD-10.
- [FHIR CodeSystem/$diff for vocabulary version changes](https://docs.omophub.com/api-reference/fhir-terminology/diff.md): Compare OMOP concepts between vocabulary releases with FHIR $diff - detect added, removed, and changed codes across Athena version upgrades.
- [FHIR ValueSet/$expand for OMOP concept sets](https://docs.omophub.com/api-reference/fhir-terminology/expand.md): Expand a FHIR ValueSet into its complete list of matching codes - hierarchy-aware, version-pinned expansions across SNOMED, LOINC, and RxNorm.
- [FHIR CodeSystem/$find-matches for property search](https://docs.omophub.com/api-reference/fhir-terminology/find-matches.md): Find OMOP concepts by property criteria using FHIR $find-matches - search by ingredient, dose form, lab method, or other coded property attributes.
- [FHIR CodeSystem/$lookup for OMOP concept details](https://docs.omophub.com/api-reference/fhir-terminology/lookup.md): Look up OMOP concept details by code and system with FHIR $lookup - return display, designations, properties, and version info for any concept.
- [FHIR CapabilityStatement and terminology metadata](https://docs.omophub.com/api-reference/fhir-terminology/metadata.md): Discover supported FHIR terminology operations, served code systems, and the active OMOP vocabulary release via the CapabilityStatement endpoint.
- [FHIR R4, R5, and R6 terminology service overview](https://docs.omophub.com/api-reference/fhir-terminology/overview.md): Standards-compliant FHIR R4/R5/R6 terminology operations over OMOP vocabularies - $lookup, $validate-code, $translate, $expand, and $subsumes.
- [FHIR CodeSystem/$subsumes for concept hierarchy](https://docs.omophub.com/api-reference/fhir-terminology/subsumes.md): Test subsumption relationships between two OMOP concepts with FHIR $subsumes - determine parent, child, equivalent, or not-subsumed status.
- [FHIR ConceptMap/$translate across OMOP vocabularies](https://docs.omophub.com/api-reference/fhir-terminology/translate.md): Translate codes between vocabularies with FHIR $translate - SNOMED to ICD-10, ICD-9 to SNOMED, RxNorm to ATC, and other OMOP standard mappings.
- [FHIR CodeSystem/$validate-code for OMOP concepts](https://docs.omophub.com/api-reference/fhir-terminology/validate-code.md): Check whether a code exists in a FHIR CodeSystem backed by OMOP vocabularies - validates SNOMED, LOINC, RxNorm, ICD-10, and HCPCS codes on the wire.
- [FHIR ValueSet search for OMOP concept sets](https://docs.omophub.com/api-reference/fhir-terminology/valueset-search.md): Discover whether a FHIR ValueSet is supported by OMOPHub before calling $expand or $validate-code - catalog lookup for common clinical value sets.
- [FHIR ValueSet/$validate-code membership check](https://docs.omophub.com/api-reference/fhir-terminology/valueset-validate-code.md): Check whether an OMOP code is a member of a specified FHIR ValueSet - validate Observations, Conditions, and Medications against expected sets.
- [Resolve FHIR Coding](https://docs.omophub.com/api-reference/fhir/resolve.md)
- [Resolve FHIR Codings - Batch](https://docs.omophub.com/api-reference/fhir/resolve-batch.md)
- [Resolve FHIR CodeableConcept](https://docs.omophub.com/api-reference/fhir/resolve-codeable-concept.md)
- [Get Concept Ancestors](https://docs.omophub.com/api-reference/hierarchy/get-concept-ancestors.md): Retrieve all ancestor OMOP concepts for a given concept - hierarchical context, classification paths, and parent terms for concept set expansion.
- [Get Concept Descendants](https://docs.omophub.com/api-reference/hierarchy/get-concept-descendants.md): Retrieve all descendant OMOP concepts for a given concept - hierarchical children and specialized terms for phenotype and cohort definitions.
- [Get Concept Hierarchy](https://docs.omophub.com/api-reference/hierarchy/get-concept-hierarchy.md): Retrieve the complete OMOP hierarchy for a concept - ancestors and descendants in one unified view for phenotype development and concept sets.
- [OMOPHub REST API and FHIR terminology introduction](https://docs.omophub.com/api-reference/introduction.md): Base URLs, authentication, core capabilities, and quick-start examples for the OMOPHub REST API and FHIR R4/R5/R6 terminology service.
- [Batch Map Concepts](https://docs.omophub.com/api-reference/mappings/batch-map-concepts.md): Perform multiple OMOP concept mapping operations in a single batched request - high-throughput cross-vocabulary translation for ETL pipelines.
- [Get Concept Mappings](https://docs.omophub.com/api-reference/mappings/get-concept-mappings.md)
- [Get Mapping Coverage](https://docs.omophub.com/api-reference/mappings/get-mapping-coverage.md): Analyze mapping coverage between a source and target OMOP vocabulary - quantify how many concepts translate across SNOMED, ICD-10, LOINC, and RxNorm.
- [Get Mapping Quality](https://docs.omophub.com/api-reference/mappings/get-mapping-quality.md): Analyze OMOP mapping quality between two vocabularies to assess reliability and trustworthiness of cross-vocabulary translations for production use.
- [Map Concepts](https://docs.omophub.com/api-reference/mappings/map-concepts.md): Map medical concepts between OMOP vocabularies to find equivalent or related concepts across SNOMED, ICD-10, LOINC, RxNorm, and other terminologies.
- [Validate Mappings](https://docs.omophub.com/api-reference/mappings/validate-mappings.md): Validate the accuracy and quality of OMOP concept mappings between vocabularies - verify translations before committing them to source_to_concept_map.
- [API rate limits, quotas, and throttling headers](https://docs.omophub.com/api-reference/rate-limit.md): Understand OMOPHub API rate limits per plan, how to read throttling response headers, and how to request higher quotas for production workloads.
- [List Relationships for a Concept](https://docs.omophub.com/api-reference/relationships/get-concept-relationships.md): Retrieve all relationships for a specific OMOP concept - Maps to, Is a, ingredient of, and vocabulary-specific links for crosswalk analysis.
- [Get Relationship Types](https://docs.omophub.com/api-reference/relationships/get-relationship-types.md): Retrieve all available OMOP relationship types - Maps to, Is a, Subsumes, and the complete set of OHDSI-defined links between medical concepts.
- [Advanced Search](https://docs.omophub.com/api-reference/search/advanced-search.md): Perform multi-criteria search across OMOP medical vocabularies with advanced filtering by domain, vocabulary, concept class, and standard status.
- [Basic Concept Search](https://docs.omophub.com/api-reference/search/basic-search.md)
- [Bulk Search](https://docs.omophub.com/api-reference/search/bulk-search.md): Perform OMOP concept search on multiple queries simultaneously with optimized batch processing - ideal for ETL pipelines and terminology mapping jobs.
- [Get Similar Concepts by ID](https://docs.omophub.com/api-reference/search/get-search-similar-by-id.md): Find OMOP concepts similar to a specific concept identified by its concept ID using semantic similarity - discover related clinical terminology fast.
- [Search Autocomplete](https://docs.omophub.com/api-reference/search/search-autocomplete.md): Get real-time autocomplete suggestions for OMOP medical terminology searches with optional phonetic matching for typo-tolerant clinical lookups.
- [Search Facets](https://docs.omophub.com/api-reference/search/search-facets.md): Retrieve search facets for filtering medical terminology search results by vocabulary, domain, concept class, and standard concept status.
- [Search Similar Concepts](https://docs.omophub.com/api-reference/search/search-similar.md): Find semantically similar medical concepts using advanced machine learning algorithms with flexible search criteria and body parameters.
- [Search Suggest](https://docs.omophub.com/api-reference/search/search-suggest.md): Get intelligent search suggestions and alternative query recommendations based on user intent, medical context, and search patterns.
- [Search Trending](https://docs.omophub.com/api-reference/search/search-trending.md): Retrieve trending and popular OMOP concept search queries based on platform-wide usage patterns and analytics data to surface relevant terms.
- [Bulk Semantic Search](https://docs.omophub.com/api-reference/search/semantic-bulk-search.md): Perform semantic OMOP concept search on multiple natural-language queries simultaneously with optimized batch processing for LLM and AI workflows.
- [Semantic Search](https://docs.omophub.com/api-reference/search/semantic-search.md)
- [Get Vocabulary Details](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary.md)
- [Get Vocabulary Concept Classes](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-concept-classes.md): Retrieve all concept classes within a specific OMOP vocabulary - Clinical Finding for SNOMED, Ingredient for RxNorm, and each vocabulary's class set.
- [Get Vocabulary Concepts](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-concepts.md): Get concepts within a specific OMOP vocabulary with pagination - browse SNOMED, ICD-10, LOINC, RxNorm, or any of 100+ vocabulary code lists.
- [Get Vocabulary Domain Statistics](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-domain-stats.md): Get statistics for a specific domain within an OMOP vocabulary - concept counts and standard coverage per Condition, Drug, Measurement, and more.
- [Get Vocabulary Domains](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-domains.md): Retrieve all OHDSI domains available within a specific OMOP vocabulary - filter by the domains SNOMED, ICD-10, or RxNorm actually cover.
- [Get Vocabulary Releases](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-releases.md): Retrieve the list of all available OHDSI OMOP vocabulary dataset releases, including release dates, version identifiers, and validity metadata.
- [Get Vocabulary Statistics](https://docs.omophub.com/api-reference/vocabularies/get-vocabulary-stats.md): Retrieve comprehensive statistics for a specific OMOP vocabulary including concept counts, standard concept coverage, and domain distribution breakdown.
- [List Vocabularies](https://docs.omophub.com/api-reference/vocabularies/list-vocabularies.md): Get a paginated list of all available OMOP medical vocabularies - SNOMED CT, ICD-10, LOINC, RxNorm, ATC, HCPCS, and 100+ OHDSI-supported terminologies.
- [Search Vocabularies](https://docs.omophub.com/api-reference/vocabularies/search-vocabularies.md): Search across OMOP vocabulary names and descriptions to find the right terminology - SNOMED, LOINC, ICD-10, and the full OHDSI-supported catalog.
- [Authentication and API key overview for OMOPHub](https://docs.omophub.com/authentication/overview.md): Understand OMOPHub authentication options including API keys and bearer tokens, scopes, header usage, and security best practices for API access.
- [EHR Integration](https://docs.omophub.com/guides/integration/ehr-integration.md): Resolve EHR-native codes to standardized OMOP concepts for clinical decision support, lab normalization, and bidirectional EHR vocabulary integration.
- [EHRbase and openEHR integration with OMOPHub](https://docs.omophub.com/guides/integration/ehrbase-openehr.md): Configure EHRbase to use OMOPHub as a remote FHIR R4 terminology server for validating coded openEHR template elements and ValueSet expansion.
- [FHIR Integration](https://docs.omophub.com/guides/integration/fhir-integration.md): Use OMOPHub with FHIR - the FHIR Resolver for CodeableConcept mapping, the FHIR Terminology Service, and recipes for Observations and Medications.
- [HAPI FHIR Integration](https://docs.omophub.com/guides/integration/hapi-fhir.md): Configure HAPI FHIR to use OMOPHub as a remote terminology backend - $validate-code, $lookup, and $translate over the FHIR R4/R5 wire protocol.
- [Batch & Performance Best Practices](https://docs.omophub.com/guides/production/batch-performance.md): Optimize OMOPHub API usage for ETL pipelines, bulk lookups, and high-throughput workflows - deduplicate before mapping, batch, and cache stable data.
- [Interoperability Test Matrix](https://docs.omophub.com/guides/production/interop-test-matrix.md): Supported FHIR operations, tested clients, auth patterns, and known integration scenarios for OMOPHub - check compatibility before writing code.
- [Known Limitations](https://docs.omophub.com/guides/production/known-limitations.md): What OMOPHub does not do - explicit product boundaries around write operations, custom vocabularies, and PHI so you can plan your integration safely.
- [Security & Data Handling](https://docs.omophub.com/guides/production/security-data-handling.md): What data OMOPHub receives and stores, plus how the API handles authentication, logging, and privacy - written for security reviewers and developers.
- [Why OMOPHub vs Self-Hosting](https://docs.omophub.com/guides/production/why-omophub.md): An honest comparison of using OMOPHub versus downloading ATHENA and running your own OMOP vocabulary database, with guidance on when each choice fits.
- [Clinical Coding Automation](https://docs.omophub.com/guides/use-cases/clinical-coding.md): Automate clinical coding workflows with OMOPHub - go from raw clinical text to standardized OMOP concepts for billing, documentation, and analytics.
- [Clinical Trial Eligibility Screening](https://docs.omophub.com/guides/use-cases/clinical-trial-eligibility.md): Resolve clinical trial criteria to OMOP concept sets and screen patients using hierarchy expansion and set-based matching for eligibility at scale.
- [Collaborative Mapping](https://docs.omophub.com/guides/use-cases/collaborative-mapping.md): Use OMOPHub to build shareable source_to_concept_map files that accelerate multi-site OMOP mapping and break the per-site mapping silo tax.
- [Drug Interaction Checking](https://docs.omophub.com/guides/use-cases/drug-interaction-checking.md): Move beyond alert fatigue with OMOPHub - resolve drug names to standardized RxNorm ingredients via the hierarchy for smarter drug-drug interaction checking.
- [Gap Analysis and OHDSI Contributions](https://docs.omophub.com/guides/use-cases/gap-analysis-contributions.md): Spotting the missing links in OMOP standard vocabularies - use OMOPHub to automate gap detection and build focused shortlists for OHDSI contributions.
- [Insurance Claims Processing](https://docs.omophub.com/guides/use-cases/insurance-claims-processing.md): Standardize CPT, ICD-10, and HCPCS billing codes to OMOP clinical concepts for medical necessity review, fraud detection, and risk adjustment workflows.
- [Laboratory Result Mapping](https://docs.omophub.com/guides/use-cases/laboratory-result-mapping.md): Map messy local lab names to standardized LOINC codes using OMOPHub vocabulary search - bridge lab-speak to OMOP for analytics and interoperability.
- [Lean ETL Mapping Cache](https://docs.omophub.com/guides/use-cases/lean-etl-mapping-cache.md): Build validated OMOP mapping caches with OMOPHub during development and apply them locally at production speed - no full vocabulary load required.
- [Phenotype Development & Concept Set Expansion](https://docs.omophub.com/guides/use-cases/phenotype-development.md): Build comprehensive OMOP concept sets for phenotype development using OMOPHub hierarchy, mapping, and semantic search APIs for clinical research.
- [Population Health Analytics](https://docs.omophub.com/guides/use-cases/population-health-analytics.md): Analyze population health trends using OMOPHub hierarchy expansion, cross-vocabulary mapping, and OMOP CDM SQL queries for public-health action.
- [Vocabulary Lifecycle Management](https://docs.omophub.com/guides/use-cases/vocabulary-lifecycle-management.md): Automate detection of stale OMOP vocabularies and deprecated concepts with OMOPHub so you only update from Athena when changes actually affect you.
- [FHIR → OMOP Standardization](https://docs.omophub.com/guides/workflows/fhir-to-omop.md): The complete workflow from FHIR-coded clinical data to standardized OMOP CDM tables - resolve CodeableConcepts, assign domains, and load CDM tables.
- [Introduction](https://docs.omophub.com/introduction.md): OMOPHub is a REST API for OHDSI ATHENA medical vocabularies - search 11M+ OMOP concepts across SNOMED CT, ICD-10, LOINC, RxNorm, and 100+ terminologies.
- [Quickstart - search, map, and resolve codes in 5 min](https://docs.omophub.com/quickstart.md): Get up and running with the OMOPHub API in five minutes - search OMOP concepts, map across vocabularies, and resolve FHIR codes to standard CDM types.
- [Python SDK - Working with OMOP medical concepts](https://docs.omophub.com/sdks/python/concepts.md): Work with OMOP medical concepts in the OMOPHub Python SDK - retrieve, search, and inspect concept details, synonyms, and relationships programmatically.
- [Python SDK - Working with OMOP domains](https://docs.omophub.com/sdks/python/domains.md): Work with OMOP domains in the OMOPHub Python SDK - list Condition, Drug, Measurement, and Procedure domains and query their concepts from Python code.
- [Python SDK - Error handling and retries](https://docs.omophub.com/sdks/python/error-handling.md): Handle OMOPHub API errors gracefully from the Python SDK - catch rate-limit, authentication, and validation exceptions with retry-ready patterns.
- [Python SDK - FHIR Resolver for OMOP concepts](https://docs.omophub.com/sdks/python/fhir.md): Resolve FHIR Coding and CodeableConcept values to OMOP standard concepts from the OMOPHub Python SDK with one call - ideal for Python-based ETL pipelines.
- [Python SDK - Mapping concepts across vocabularies](https://docs.omophub.com/sdks/python/mappings.md): Map concepts between OMOP vocabularies using the OMOPHub Python SDK - crosswalk SNOMED, ICD-10, LOINC, and RxNorm codes from Python applications.
- [OMOPHub Python SDK - installation and quickstart](https://docs.omophub.com/sdks/python/overview.md): Get started with the OMOPHub Python SDK - install, authenticate, and run your first concept search, mapping, and FHIR resolve from Python in minutes.
- [Python SDK - Searching OMOP medical concepts](https://docs.omophub.com/sdks/python/search.md): Search OMOP medical concepts across SNOMED, ICD-10, LOINC, and RxNorm from the OMOPHub Python SDK with keyword, semantic, and filtered queries.
- [Python SDK - Working with OMOP vocabularies](https://docs.omophub.com/sdks/python/vocabularies.md): Work with OMOP vocabularies in the OMOPHub Python SDK - list, describe, and query SNOMED, ICD-10, LOINC, RxNorm, and 100+ terminologies from Python.
- [R SDK - Working with OMOP medical concepts](https://docs.omophub.com/sdks/r/concepts.md): Work with OMOP medical concepts in the OMOPHub R SDK - retrieve, search, and inspect concept details, synonyms, and relationships for R analytics code.
- [R SDK - Working with OMOP domains](https://docs.omophub.com/sdks/r/domains.md): Work with OMOP domains in the OMOPHub R SDK - list Condition, Drug, Measurement, and Procedure domains and pull their concepts directly into R tibbles.
- [R SDK - Error handling and retries](https://docs.omophub.com/sdks/r/error-handling.md): Handle OMOPHub API errors gracefully from the R SDK - catch rate-limit, authentication, and validation errors with retry-ready patterns for OHDSI work.
- [R SDK - FHIR Resolver for OMOP concepts](https://docs.omophub.com/sdks/r/fhir.md): Resolve FHIR Coding and CodeableConcept values to OMOP standard concepts from the OMOPHub R SDK with one call - ideal for R-based OHDSI pipelines.
- [R SDK - Mapping concepts across vocabularies](https://docs.omophub.com/sdks/r/mappings.md): Map concepts between OMOP vocabularies using the OMOPHub R SDK - crosswalk SNOMED, ICD-10, LOINC, and RxNorm codes directly from OHDSI R scripts.
- [OMOPHub R SDK - installation and quickstart](https://docs.omophub.com/sdks/r/overview.md): Get started with the OMOPHub R SDK - install, authenticate, and run your first concept search, mapping, and FHIR resolve for OHDSI analytics in minutes.
- [R SDK - Searching OMOP medical concepts](https://docs.omophub.com/sdks/r/search.md): Search OMOP medical concepts across SNOMED, ICD-10, LOINC, and RxNorm from the OMOPHub R SDK with keyword, semantic, and filtered queries for OHDSI.
- [R SDK - Working with OMOP vocabularies](https://docs.omophub.com/sdks/r/vocabularies.md): Work with OMOP vocabularies in the OMOPHub R SDK - list, describe, and query SNOMED, ICD-10, LOINC, RxNorm, and 100+ terminologies from R scripts.
- [Vocabulary Releases](https://docs.omophub.com/vocabulary-versions.md): Learn about available OMOP vocabulary release versions, how to pin a specific release in API calls, and manage vocabulary updates from OHDSI Athena.

## OpenAPI Specs

- [openapi](https://docs.omophub.com/api-reference/openapi.json)