On January 7, 2026, the Arizona Department of Insurance and Financial Institutions (DIFI) published Regulatory Bulletin 2026-01. The bulletin provides guidance to ensure uniform adherence among Arizona health plans regarding mandatory coverage of biomarker testing. The bulletin was issued, in part, to respond to observed noncompliance, especially denials based on outdated utilization review criteria.
Since January 1, 2023, Arizona law has required insurers to cover biomarker testing if it provi