Healthcare’s Agent Bytecode: X12 as the Harness for AI Agents — Vasant Kearney, Onlay
Aug 19, 2026 · 20:25
Vasant Kearney of Onlay argues that X12, the healthcare claims data standard, is the harness for AI agents: every step of the claim lifecycle—from eligibility (270) through acknowledgment (999) to payment (835)—has an X12 correspondence, and an agent calling a payer or driving a portal is emitting the same transaction by another route. He says phone, portal, and X12 surfaces are built by different teams and can all agree on the wrong answer, so no surface is ground truth; his system keeps a semi-correct internal X12 representation, correct only until downstream evidence says otherwise. Enterprise memory must live in a database rather than local disk, and swapping in a stronger model is not automatically better inside a system built around the old one—evals and validation must be redone. The goal is cutting insurance costs and improving patient experience, and that means being AI pilled but also AI skeptical.
