Getting Autism Therapy Covered by Insurance in Washington

Washington’s mandate

RCW 48.46.291 and 48.44.341 (mental health parity) requires state-regulated health plans in Washington to cover the diagnosis and treatment of autism spectrum disorder, including applied behavior analysis.

Ages covered: No autism-specific age limit. Washington does not run a separate autism mandate with its own ceiling — autism is covered as a mental health condition under the DSM categories, so the limits that apply are the ones that apply to medical and surgical care.

Dollar cap: No autism-specific cap. The statute allows treatment limitations and financial requirements on mental health services ONLY if the same limitations are imposed on medical and surgical coverage. Deductibles and out-of-pocket maximums must be single and shared, not separate for mental health.

Because Washington works through parity rather than a bespoke autism law, the argument to make is comparative: show that the plan treats autism treatment worse than it treats a comparable physical condition. The copayment or coinsurance for mental health services may be no more than for medical and surgical services, and any maximum out-of-pocket or stop-loss must be a single combined limit.

Whether the mandate applies to your plan

This is the question to settle first, because the answer decides whether anything above is enforceable for you. State insurance mandates bind fully insured plans. Self-funded employer plans — where the employer pays claims itself and an insurer only administers them — are generally exempt under federal ERISA, and they cover roughly six in ten people with employer coverage.

Ask your HR department, in writing, which type your plan is. If it is self-funded, RCW 48.46.291 and 48.44.341 (mental health parity) does not compel coverage — but federal parity law may still help, and many large self-funded employers cover ABA voluntarily. Ask what the plan actually covers rather than assuming the answer is no.

The Medicaid route

Apple Health covers ABA through the Health Care Authority's ABA program. It is administered separately from the private mandate and has its own provider and authorization rules, so ask HCA directly rather than assuming your private plan's process carries over.

How Medicaid waivers work covers the route for families who do not qualify on income alone.

When you are denied

1. Get the denial reason in writing. Insurers must give a specific reason, and the appeal has to answer that reason rather than restate the diagnosis.
2. File the internal appeal within the deadline on the denial letter, with a letter of medical necessity that addresses the stated reason directly.
3. Request external review if the internal appeal fails. Fully insured plans carry external review rights, and an independent reviewer overturns denials more often than families expect.
4. Complain to the Washington Office of the Insurance Commissioner on 1-800-562-6900 if you believe RCW 48.46.291 and 48.44.341 (mental health parity) is being violated. Their consumer pages are here.