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Washington Insurance Commissioner rulemaking (insurers and regulated entities) · August 19, 2025 · Primary source

Mental Health Parity Rulemaking (R 2025-13)

Score 85PRIMARYregulatoryState insurance deptWA

Summary

Washington's Office of the Insurance Commissioner initiated rulemaking in August 2025 to implement E2SHB 1432, which updates Washington's mental health parity law and incorporates the September 2024 federal MHPAEA final rule into state law under a new unified statute, RCW 48.43.766. The legislation replaces carrier-type-specific parity statutes and requires that utilization and clinical review criteria for mental health and substance use disorder services be consistent with generally accepted standards of care. A prepublication draft of the proposed rule was released August 3, 2026, with a comment period that closed August 18, 2026. The rulemaking targets updates to WAC chapter 284-43 and related sections.

What this may mean

All types of health carriers operating in Washington will be subject to a unified mental health parity standard under RCW 48.43.766 once the rule is finalized, replacing the prior carrier-type-specific statutes. The rule will require carriers to align utilization management and clinical review criteria for BH and SUD services with generally accepted standards of care, incorporating the federal MHPAEA final rule's standards at the state level. The rulemaking is still in the prepublication draft stage, so the precise compliance obligations and effective date remain subject to the notice-and-comment process.

Informational only. Not legal, medical, financial, or other professional advice. Always consult a qualified professional familiar with your specific facts before relying on any item.

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