How to Appeal an ABA Therapy Denial
A step-by-step plan to fight an ABA denial, with deadlines, forms, and what your BCBA must provide.
Start with the Deadline
Your denial letter includes a deadline to appeal. Miss it and you lose your right to challenge the decision. Most plans give you 180 days from the date of the denial, but some give only 60. Check the letter and mark the date on your calendar today.
The deadline applies to both the internal appeal and the external review. If you miss the internal appeal window, you usually cannot request an external review. If your child is in active treatment and the denial would interrupt services, you may qualify for an expedited appeal, which forces a decision within 72 hours.
Understand the Three Denial Reasons
Denials fall into three buckets. Knowing which one you got tells you what evidence to gather.
Not medically necessary means the plan says ABA is not needed or not effective for your child. Missing documentation means the plan did not get the records it needed, often because the provider sent incomplete notes. Out of network means the provider is not in your plan's network, so the plan refuses to pay or pays less.
- Not medically necessary: you need a detailed letter from your BCBA and possibly a second opinion.
- Missing documentation: you need to resubmit the missing items, often with a cover letter listing what was sent.
- Out of network: you need to argue that no in-network provider can meet your child's needs, or that the denial violates your state's autism mandate.
File the Internal Appeal
The internal appeal is your first formal challenge. You file it with your insurance company, not with an outside agency. The denial letter tells you where to send it, often by fax or through an online portal. Use the exact address or fax number on the letter.
Write a short cover letter that says you are appealing the denial of ABA services for your child, gives your policy number and claim number, and lists the documents you are attaching. Attach the denial letter, your child's diagnosis, the treatment plan, and any progress notes from the last six months. Keep a copy of everything you send.
The insurance company must usually decide within 30 days for a pre-service denial, which means the service has not started yet, and within 60 days for a post-service denial, which means you already received the service. If they do not decide in time, you can treat it as a denial and move to external review.
What Your BCBA Must Supply
Your BCBA is your strongest ally. They need to write a letter that directly answers the reason for the denial. The letter should state the diagnosis, the specific ABA interventions, the frequency and duration of services, and the functional goals. It should also explain why ABA is medically necessary, not just helpful.
Ask your BCBA for objective data: baseline scores, progress graphs, and notes on how your child's behavior affects daily life. If the denial says not medically necessary, the BCBA should cite peer-reviewed studies that show ABA is effective for children with autism. If the denial says missing documentation, the BCBA should resubmit the exact missing items, like the treatment plan or the assessment.
Request a Peer-to-Peer Review
A peer-to-peer review is a phone call between your BCBA and a doctor or clinician at the insurance company. You can request it during the internal appeal, and some plans allow it before you file a formal appeal. The goal is to let your BCBA explain the medical necessity directly to the person who can approve it.
Your BCBA will need to prepare a summary of the case and have the treatment plan in front of them. The call usually lasts 15 to 30 minutes. You can ask to be on the call, but most plans allow only the provider and the insurance clinician. If the peer-to-peer review does not overturn the denial, you still have the right to an external review.
Move to External Review
If the internal appeal is denied, you can request an external review by an independent organization. This is a separate body that is not part of your insurance company. You must file within four months of the internal appeal denial, but check your denial letter because some states give less time.
You will fill out a form from your state's insurance department or the independent reviewer assigned to your plan. Include the same documents you used in the internal appeal, plus the internal appeal decision. The external reviewer must decide within 45 days for a standard review, or within 72 hours for an expedited review if your child's health is at risk.
The external review decision is binding on the insurance company. If they lose, they must cover the services as described in the treatment plan. If they win, you still have options like filing a complaint with your state's insurance department or, in some cases, suing under ERISA if your plan is self-funded.
Know Your State's Rules
All 50 states have an autism insurance mandate, but they apply only to state-regulated plans, which are typically fully insured plans that you buy on your own or get from a small employer. If your plan is self-funded, which means your employer pays claims directly, your state mandate does not apply. Your denial letter or your HR department can tell you which type you have.
Even if your state mandate does not apply, your plan may still cover ABA voluntarily. Check your plan documents for the specific ABA benefit and the medical necessity criteria. If your plan does not cover ABA at all, your appeal will focus on whether the denial violates your state's mandate or, for self-funded plans, whether the plan's terms are being applied correctly.