A Roadmap for Traditional Medicine Health IT Standards: TM1-Centric Dual Coding with SNOMED CT, FHIR, and OMOP, Using Korea as a Case

The ICD-11 release renewed interest in comparable traditional medicine data. The ICD-11 Traditional Medicine chapter, known as TM1, supports optional dual coding for morbidity but is not used for mortality reporting. TM1 includes two entity types: traditional medicine disorders and patterns. Coders may record a TM1 disorder, a TM1 pattern, or both, always paired with a primary diagnosis from Chapter 01 to 25.This roadmap coordinates TM1 with SNOMED CT and LOINC for clinical semantics, HL7 FHIR R5 for product and ingredient catalogs and prescribing workflows, and the OMOP Common Data Model for analytics. A clear boundary for FHIR has been drawn:FHIR Product-Definition resources represent catalog data, not care events. Clinical events use Medication, MedicationRequest, and MedicationDispense. This distinction is important in traditional medicine-authorized manufactured products fit the Product-Definition resources, while compounded prescriptions prepared in healthcare settings usually lack product master entries and should be captured as medication based care events with ingredient-level details. The OMOP handoff uses ETL mapping tables linking FHIR identifiers and ingredients to OMOP standard concepts, without assuming one-to-one equivalence. This roadmap proposes to add TM1 as an optional supplementary code in the next KCD revision. Also, the site checklist in this roadmap covers regulations, co-coding examples, EHR certification, terminology management, FHIR catalogues, and OMOP loading. This would improve international comparability and safety surveillance and support clinical research and AI applications more strongly. This is helpful as it will not interfere with current medical reimbursement or mortality management workflows.