ORCA (Nichi-Rece) Is Not an Electronic Medical Record System — Medical Billing Systems and Healthcare IT Architecture from an Engineer's Perspective (archived 2026-08-30)

Abstract

ORCA (Nichi-Rece) is not an electronic medical record system — it is a medical billing system. From an engineer's perspective, this article covers the system architecture of a medical institution, receipt (medical fee claim) work, what is inside the roughly 4.06 million lines of COBOL, the Nichi-Rece API, and the key points of the WebORCA migration, all measured against the publicly released source. Archived version of https://comcomponent.com/en/blog/what-is-orca-engineer-view/, as published on 2026-08-30. The live article is maintained and may change after this date. First published 2026-07-17.