The IMO Health Knowledge Graph is a commercial clinical knowledge graph developed by IMO Health (formerly Intelligent Medical Objects) that links clinical language, concepts, and codes into a shared context layer for healthcare data. It is built on IMO's clinical interface terminology, curated since 1994 by clinical informaticists and coding specialists, and contains millions of concepts, relationships, and cross-mappings derived from real-world clinical documentation. The graph encodes concept hierarchies, clinical relationships, and cross-maps among standard code systems including ICD-10-CM, ICD-9-CM, ICD-10-PCS, SNOMED CT, CPT, HCPCS, LOINC, RxNorm, and NDC. IMO reports that the underlying terminology is used by more than 90% of U.S. clinicians across 4,500+ provider organizations and every major EHR, and that it supports roughly 12 billion terminology search transactions per year. In April 2026 IMO Health opened direct developer access to the graph through a GraphQL API and a Model Context Protocol (MCP) server that exposes graph traversal, hierarchy, and cross-mapping operations as tools for AI agents. The graph itself is proprietary, and access requires a commercial license and credentials; no public bulk download or open query endpoint is available.
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