Case studies
Working proof
Every case study here is a running artifact: a clean-room prototype built on open standards and synthetic data, judged by the same tests a reviewer would run, with its limits stated next to its results.
Prior authorization, translated
A conformance gateway in front of an unmodified legacy payer took it from 11 passing tests to 39 on the official Da Vinci PAS suite, without changing a line of the payer itself.
Zero errors, wrong twice
A FHIR ChargeItem billing pipeline logged 412 accepted and zero errors. Full-volume reconciliation against the source ledger found the unbilled treatment and the duplicate charge it got wrong anyway.
Structurally valid, physiologically impossible
A vendor-neutral PFT-to-EHR HL7 v2 interface round trips a valid study end to end, then quarantines a well-formed message whose FEV1 exceeds its FVC before it reaches the wire.
Turn the old system off with a config flag
A coexistence layer conforms a legacy HL7 v2 feed into US Core FHIR, quarantines a PHQ-9 whose total is not the sum of its items, then retires the legacy intake with one config flag. Same event, same consumers, nothing downstream notices.