Blog
Technical articles about FHIR conformance, regulatory compliance, and continuous monitoring
Productized Consulting for CMS-0057-F Readiness
Tessara is opening a productized consulting practice. Fixed scope, fixed price, fixed timeline — built around the same drift-detection engine that powers the product.
Read full article →The CMS-0057-F Compliance Countdown: What Payers Need Done by January 1, 2027
A month-by-month payer roadmap to the CMS-0057-F January 1, 2027 deadline. Concrete activities, real lead times, no enforcement theater.
Read full article →A Payer's Self-Audit Checklist for FHIR API Conformance
25 concrete checks a payer engineering team can run this week to assess CMS-0057-F FHIR API conformance. Real items, no fluff, do it yourself.
Read full article →Six Ways Your FHIR API Is Drifting From Spec Right Now
Real examples of the six canonical FHIR drift categories — Mandatory Element Removal, Type/Cardinality Change, Structural Extension, Auth Deviation, Endpoint Behavioral Change, Spec Version Mismatch.
Read full article →What Auditors Actually Want from Your Patient Access API (And What They Don't)
Demystifying the CMS audit posture for FHIR Patient Access APIs under CMS-0057-F and CMS-9115-F. Before, during, and after — what auditors ask, what they accept, what they reject.
Read full article →Why Application Logs Aren't Compliance Evidence
Auditors don't accept application logs as compliance evidence. Here's what they look for instead, and why signed Merkle-chained verdicts are a different category of artifact.
Read full article →CMS-0057-F Enforcement: Preparing for the 2027 Deadline
An analysis of CMS enforcement patterns and the technical requirements healthcare payers must meet by the January 2027 compliance deadline.
Read full article →How Tessara's Evidence Chain Works
Tessara produces cryptographic proof that a FHIR API was conformant at a specific moment — without ever touching a byte of patient data. Here is how the chain is constructed.
Read full article →The 6 Categories of Specification Drift: How Tessara Classifies Non-Conformance
Tessara's 6-category drift taxonomy — the structural differences between a spec-anchored baseline and a live FHIR API, ranked by regulatory severity.
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