California Bans Autism Rediagnosis Requirement for ABA Therapy Coverage: What AB 951 Means for Families (2026)

If you have a child with autism in California, you may have run into this frustrating cycle: your child was already diagnosed years ago, therapy is working, and then your insurance plan asks for a brand-new diagnostic evaluation just to keep paying for it. As of January 1, 2026, that requirement is illegal in California. A new law, AB 951, bans state-regulated health plans from requiring a "rediagnosis" of autism or another pervasive developmental disorder to maintain coverage for behavioral health treatment, including Applied Behavior Analysis (ABA) therapy.

Here is what the law actually changed, who it covers, and what to do if your plan still asks you to jump through this hoop.

What AB 951 Does

Signed by Governor Gavin Newsom on July 30, 2025, and authored by Assemblymember Tri Ta, AB 951 prohibits state-regulated health plans from requiring a health plan member who has already been diagnosed with autism spectrum disorder or another pervasive developmental disorder to be rediagnosed in order to keep receiving coverage for behavioral health treatment. It also bars plans from discontinuing or delaying a child's existing therapy while a rediagnosis or reevaluation is pending.

The law took effect for health care service plan contracts issued, amended, or renewed on or after January 1, 2026. California's Department of Managed Health Care (DMHC), which regulates most commercial HMOs and many PPOs in the state, has confirmed the requirement is in force.

Why This Was a Problem in the First Place

Autism is a lifelong, developmental condition. It does not go away and then come back, and a child's underlying diagnosis does not typically change from one year to the next. Even so, some California health plans had been requiring families to obtain a new, full diagnostic evaluation, sometimes annually, to continue authorizing ABA therapy or other behavioral health treatment.

In practice, that meant:

• Treatment gaps. Getting a new diagnostic evaluation can take weeks or months to schedule, especially given the ongoing shortage of developmental pediatricians and psychologists who perform autism evaluations. Therapy could be paused or denied while families waited.
• Added cost and burden on families. Repeat evaluations mean more appointments, more paperwork, and in some cases out-of-pocket costs, on top of a diagnosis that was never in question.
• A decision taken away from the treating clinician. The people best positioned to know whether a child still needs ABA therapy are the BCBA and physician actually treating that child, not a insurance plan's utilization review process.

AB 951 puts that decision back where advocates argued it belonged: with the treating provider, not the health plan.

Who Is Covered by AB 951

AB 951 applies to state-regulated health care service plan contracts in California, meaning most commercial HMO and many PPO plans regulated by the DMHC. As with most California insurance mandates, there are important exceptions to know about:

• Self-funded employer plans (common at larger employers) are typically governed by federal ERISA law, not California's DMHC, so AB 951 does not automatically apply to them. Check your plan's Summary Plan Description or ask your HR/benefits department whether your plan is fully insured or self-funded.
• Medi-Cal operates under a separate set of federal and state rules (including EPSDT, the Medicaid benefit that guarantees medically necessary treatment for children). If your child is on Medi-Cal and a managed care plan is asking for repeat diagnostic documentation, that is a related but separate issue worth raising directly with your plan or a Medi-Cal ombudsperson.
• Out-of-state plans are governed by that state's insurance laws, not California's, even if you live in California.

What to Do If Your Plan Still Asks for a Rediagnosis

If your California health plan requests a new diagnostic evaluation to continue authorizing ABA therapy or other behavioral health treatment for a child already diagnosed with autism, here is a practical checklist:

1. Confirm your plan type. Ask your HR department or check your plan documents to determine whether you have a state-regulated plan (covered by AB 951) or a self-funded ERISA plan (not automatically covered).
2. Ask your provider to cite the law in writing. Your BCBA or physician can submit an appeal or authorization request that references AB 951 and explains that a prior diagnosis is already on file.
3. File a complaint with the DMHC. If a state-regulated plan denies or delays coverage over a rediagnosis requirement after January 1, 2026, you can file a complaint through the DMHC's Help Center, which investigates plan compliance issues.
4. Do not let therapy lapse while you sort it out. Ask your provider about continuing care during an appeal, and keep records of every call, denial letter, and appeal you file.

How This Fits Into California's Broader Autism Insurance Landscape

AB 951 is one of several recent changes to how California regulates autism-related insurance coverage. It follows SB 805, which is opening private insurance coverage to non-ABA developmental and relationship-based treatment approaches, and comes alongside an ongoing rewrite of the Medi-Cal ABA policy manual by the Department of Health Care Services. Taken together, these changes reflect a broader shift toward giving families and treating clinicians more control over autism care decisions, and less unilateral authority for insurance plans to create administrative barriers to continuing treatment.

Find an ABA Provider in California

Whether you are just starting the diagnostic and insurance process or have been navigating California's autism insurance rules for years, working with a provider who understands the state's requirements can make a real difference. You can search the ABA Navigator directory to find ABA therapy providers near you in California, compare the insurance plans they accept, and read reviews from other families before you choose a provider.

This article is for informational purposes only and is not legal or insurance advice. If you believe your health plan is not complying with California law, contact the California Department of Managed Health Care or consult an attorney familiar with insurance law.