payer_plan_period

FHIR Coverage captures a patient's insurance enrollment (payer, plan, coverage period, subscriber relationship). It maps to OMOP payer_plan_period, which records continuous enrollment under a specific health benefit plan from a given payer. Unlike clinical event tables, payer_plan_period carries no _type_concept_id; it is purely administrative. One active Coverage resource produces one payer_plan_period row. Overlapping or adjacent periods for the same person/payer may be collapsed.