What to Do When Your ABA Insurance Claim Gets Denied: The Appeals Process

The letter arrives. Your insurance company has denied a claim or authorization request for your child's ABA therapy. The letter is dense, written in a confusing mix of policy language and acronyms, and makes almost no sense. You read it three times trying to figure out what actually happened. Meanwhile, your child's therapy is in limbo, your BCBA is waiting to hear what to do, and you have to figure out your next move while running the rest of your life.

Here's what most families don't know — and what the insurance company is counting on you not knowing: a denial is not the final answer. It's the first move in a formal appeals process that insurance companies are legally required to offer, and that process has specific steps, deadlines, and legal protections built into it. Many denials get overturned on appeal when families know how to work the process. The ones that don't get appealed stay denied, which is exactly what the insurer wants.

This article walks you through the appeals process step by step — understanding the specific denial reason, gathering the right documentation, filing a formal internal appeal, and what escalation options exist (state insurance commissioner complaints, external review) if the internal appeal doesn't succeed. It's written for families in North Carolina, Georgia, and Maryland, with the specific state protections for each flagged along the way.

Let's get into it.

Step 1: Understand the Specific Denial Reason

The single biggest mistake families make is treating a denial as a yes-or-no. Insurance denials come in several specific flavors, and the right appeal strategy depends entirely on which flavor you're dealing with. Read your denial letter carefully — you're looking for the specific reason code and language.

Common denial categories:

"Not medically necessary." The insurer's medical reviewer decided ABA (or the requested amount of ABA) wasn't medically necessary for your child's condition. This is the most common denial category, and it's almost always appealable with better documentation.

"Service exclusion." The plan says it doesn't cover ABA at all, or doesn't cover ABA for your child's specific age or diagnosis. This may be a legitimate exclusion, or it may violate state autism mandates — check which type of plan you have (see below).

"Prior authorization not obtained." The service was delivered without the required pre-approval. This may be a billing fix rather than an actual coverage denial.

"Experimental or investigational." The insurer is claiming ABA (or the specific intervention) isn't established as medically necessary. This argument has become harder for insurers to make given the strong evidence base for ABA, but it still happens.

"Benefit limit reached." Your child hit the annual visit, hour, or dollar cap on the plan. State autism mandates often prohibit these caps — check whether yours applies.

"Out of network." The provider isn't in the insurer's network. This may require an in-network alternative or a network adequacy argument.

"Documentation deficient." The authorization request didn't include the specific information the insurer needed. Often this is the easiest denial to overturn — you just submit what's missing.

"Diagnosis not covered." The insurer is challenging the autism diagnosis itself, or saying the diagnosis doesn't meet their coverage criteria.

Billing/coding error. The denial is technically about a procedure code or billing error, not about coverage. These are usually fixable with the provider's billing team.

Your appeal strategy depends on which of these you're dealing with — so this is the first and most important question to answer before you do anything else.

Step 2: Confirm What Kind of Insurance You Have

Your rights depend heavily on your plan type. Figure this out before you file anything.

• State-regulated commercial insurance (bought on healthcare.gov, through a small employer, or directly from an insurer): governed by state insurance law. State autism mandates apply. State insurance commissioner has oversight.
• Self-funded ERISA plan (typically through a large employer): governed by federal ERISA law. State autism mandates may NOT apply. External review is still required under federal law.
• Medicaid or Medicaid managed care: governed by state Medicaid rules and the federal EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) benefit for children under 21. EPSDT requires coverage of medically necessary services.
• TRICARE: operates under its own Autism Care Demonstration rules.

Not sure which category you're in? Call your HR department (for employer-sponsored plans) or your insurance company directly and ask: "Is this plan fully insured and state-regulated, or is it self-funded?" The answer matters.

Step 3: Gather the Right Supporting Documentation

The appeal is only as strong as the documentation you submit. Here's what to pull together:

From your BCBA:

• A letter of medical necessity that directly addresses the insurer's denial reason, point by point
• Current treatment plan with specific target behaviors, interventions, and goals
• Progress data showing what has been accomplished and what remains
• Functional Behavior Assessment (FBA) if applicable
• Standardized assessment scores (Vineland-3, ABAS-3, VB-MAPP, ABLLS-R)

From medical providers:

• Autism diagnostic evaluation (ADOS-2 report, developmental pediatrician's letter, or psychologist's evaluation)
• Supporting letter from pediatrician or developmental pediatrician if available
• Any relevant medical records

From you (the parent):

• A clear appeal letter stating what you're appealing and why
• Specific examples of what your child cannot currently do without ABA
• Documentation of what has been tried at lower levels of service and didn't produce enough progress (if applicable)

The specific language matters. The letter of medical necessity should mirror the insurer's own medical necessity criteria wherever possible. If the insurer's criteria say "the member must demonstrate X," your letter should explicitly show "the member demonstrates X, as evidenced by Y and Z."

The BCBA's letter is the single most important document in the entire appeal — and it's what most families don't know to ask for. Work with your BCBA to make sure the letter addresses the specific denial reason, not just general clinical reasoning.

Step 4: File the Internal Appeal

Every insurance plan is legally required to offer at least one internal appeal — the insurance company reviewing its own decision. This is your first and most important move.

Deadlines matter. For most commercial plans, you have 180 days from the denial letter to file an internal appeal. For some Medicaid managed care plans, it's shorter — sometimes as little as 30 days. The denial letter should state the deadline. If it doesn't, call and ask, then confirm in writing.

What to submit:

• A written appeal letter stating you're appealing the specific denial, requesting approval of the full requested services
• The letter of medical necessity from your BCBA
• All supporting documentation (treatment plan, assessments, medical records)
• The denial letter itself (so the appeal reviewer has the full history)

How to submit:

• In writing, through the specific method the plan requires (fax, mail, portal, or email)
• Keep copies of everything you send
• Request confirmation of receipt
• Mark your calendar for the response deadline (insurers typically must respond within 30 days for standard appeals and 72 hours for urgent appeals)

Urgent vs. standard appeals. If the delay in getting services could cause serious harm (significant maladaptive behavior that's escalating, safety concerns like elopement, significant developmental regression), you can request an urgent appeal — which must be decided within 72 hours. Your BCBA can document why urgency is warranted.

Request a peer-to-peer review. During or after the internal appeal, your BCBA can request a direct conversation with the insurer's clinical reviewer. These peer-to-peer reviews often have better outcomes than paper-only reviews because your BCBA can respond to specific concerns in real time. Ask your BCBA whether they'll participate, and make sure they prepare with the insurer's specific medical necessity criteria in hand.

Step 5: If the Internal Appeal Is Denied — External Review

If the internal appeal is denied, you have the legal right to an external review by an independent third party. This review happens outside the insurance company, and the outcome is binding on the insurer. External reviews are often more successful than internal appeals because the reviewer isn't employed by the insurer and doesn't face the same cost-containment pressures.

How to request external review:

• For state-regulated commercial plans: coordinated through your state's department of insurance
• For self-funded ERISA plans: a federal external review process applies
• For Medicaid: this is handled as a state fair hearing

Deadlines: typically 4 months from the final internal denial, but check your specific plan and state rules.

What to submit: essentially the same package as your internal appeal, strengthened by anything you learned about the insurer's reasoning during the earlier rounds. Add any new documentation that addresses the specific points raised in the internal denial.

Who reviews: an independent review organization with clinical reviewers who are not affiliated with your insurance company. For autism cases, the reviewer is often a developmental pediatrician, psychologist, or BCBA.

The external review decision is binding on the insurer — if the reviewer says the denial was wrong, the insurer must cover the service.

Step 6: State Insurance Commissioner Complaints

If you believe the insurer is violating state law — ignoring an autism mandate, imposing illegal caps, applying stricter criteria to mental health services than to medical services — you can file a complaint with your state's insurance commissioner. These complaints have real teeth. Insurers don't want them on their record, and state insurance commissioners can investigate, fine, and order corrective action.

North Carolina: NC Department of Insurance — Consumer Services Division handles complaints about commercial insurance. The state's autism coverage law (HB 498) mandates coverage for individuals under 18 with a minimum annual benefit of $40,000 on fully insured commercial plans regulated by the NC Department of Insurance.

Georgia: Georgia Office of the Commissioner of Insurance and Safety Fire handles complaints. Georgia's Ava's Law (passed in 2015) requires state-regulated plans to cover ABA therapy for autism in children under 20, with specific annual benefit requirements.

Maryland: Maryland Insurance Administration handles complaints. Maryland's autism insurance mandate requires state-regulated plans to cover ABA for autism in children with specific coverage terms.

Important: state mandates apply to state-regulated plans — not to self-funded ERISA plans. If your plan is self-funded, the state insurance commissioner has limited authority, but you still have federal protections.

Mental Health Parity — A Hidden Weapon

The federal Mental Health Parity and Addiction Equity Act (MHPAEA) requires insurance plans to provide mental health benefits (which include autism services for most plans) at parity with medical/surgical benefits. In plain English: your insurer cannot apply stricter rules to ABA than to comparable medical services.

What this means practically:

• Medical necessity criteria for ABA can't be stricter than for comparable medical services
• Annual hour or visit caps on ABA can't be more restrictive than caps on medical care
• Out-of-pocket costs can't be higher
• Prior authorization requirements can't be more onerous

If your plan is doing things with ABA it wouldn't do with a comparable medical service, you may have a parity violation — enforceable by the U.S. Department of Labor (for employer plans) and the U.S. Department of Health and Human Services. Raise this in your appeal and in any state insurance commissioner complaint.

When to Involve an Attorney or Patient Advocate

Most denials can be resolved through the standard appeal process. But some situations warrant professional help:

• Multiple appeals have been denied without clear justification
• The insurer is clearly violating state law or ERISA
• You suspect a mental health parity violation
• Your plan is self-funded ERISA and you need help navigating federal processes
• The time required to fight has become unsustainable
• You've lost significant services and your child is being harmed by the gap

Who can help:

• Patient advocates specializing in autism — some free, some fee-based
• Autism Society chapters in NC, GA, and MD often provide appeal support at no cost
• Special needs attorneys who handle insurance appeals (fee-based, often strategic)
• State insurance commissioner consumer assistance (free)
• Autism-focused legal clinics at some law schools in each state

Documentation to Keep From Day One

Start a dedicated folder — physical or digital — the moment you get your first denial. Include:

• All authorization requests and responses
• All denial letters, with dates
• Written notes from every phone call with the insurer (date, time, representative name, reference number, what was discussed)
• All appeal letters sent and responses received
• All medical records relevant to the authorization
• Current treatment plan and progress data
• Standardized assessment scores
• Any correspondence from your BCBA, pediatrician, or other providers

This folder is your evidence base at every stage. It's also what you hand to an advocate, attorney, or state regulator if the fight escalates. Families who keep thorough documentation win more appeals — it's that simple.

What Not to Do

A few common instincts that often backfire:

Don't send an angry appeal letter. Factual, specific, clinical appeals win. Emotional appeals are easier for reviewers to dismiss.

Don't miss deadlines. Appeal windows are strict. Missing one usually means losing that level of appeal entirely. Mark every date in writing.

Don't accept a verbal denial. If someone tells you on the phone that your request is denied, request the denial in writing. The written letter is what you can appeal from.

Don't stop at the first "no." The appeal process is designed to produce exhaustion. Each successive level often has a higher success rate than the previous one.

Don't let the fight stop your child's therapy. Keep your child in whatever services are currently authorized while the appeal is in progress.

Don't assume the first "no" is final. Many denials are reflexive — the insurer is counting on you giving up. Even one well-documented appeal can produce a very different outcome.

North Carolina, Georgia, Maryland: The Specific Protections

North Carolina. HB 498 (the Autism Health Insurance Coverage Law) requires fully insured commercial plans regulated by the NC Department of Insurance to cover ABA therapy for individuals under 18 with a minimum annual benefit of $40,000. NC Medicaid covers medically necessary ABA for children under 21 through EPSDT, with no hard hours cap. The NC Department of Insurance Consumer Services Division handles complaints about commercial plans.

Georgia. Ava's Law (passed in 2015) requires state-regulated plans to cover ABA therapy for autism in children under 20. Georgia Medicaid covers medically necessary ABA for children under 21 through EPSDT. The Georgia Office of the Commissioner of Insurance handles complaints.

Maryland. Maryland's autism insurance mandate requires state-regulated plans to cover ABA for autism. Maryland Medicaid covers medically necessary ABA for children under 21 through EPSDT. The Maryland Insurance Administration handles complaints.

Specific statute terms change over time — before you file an appeal citing state mandates, verify the current terms through your state's insurance department website or an autism advocacy organization. Autism Speaks maintains state-by-state insurance tracker pages that are regularly updated.

How Apex ABA Supports Families Through the Appeals Process

Apex ABA serves families across North Carolina, Georgia, and Maryland — and our team knows that getting access to the therapy your child needs is often the hardest part of the whole journey. The authorization and appeals fight is something we help families navigate every day.

Where we can help:

• Thorough initial assessments that produce authorization-ready documentation
• Letters of medical necessity written to address specific insurer criteria
• BCBA participation in peer-to-peer reviews
• Billing team support that knows how to document and appeal properly
• Guidance on which state-specific protections apply to your situation
• Coordination with your pediatrician and other providers for supporting letters
• Honest answers about what to expect — and when it's time to escalate

If your child's ABA has been denied or hours have been cut, get in touch with our team. The appeals fight is not something families should have to navigate alone.

Frequently Asked Questions

1. How long do I have to file an appeal after a denial?

For most commercial plans, you have 180 days from the denial letter to file an internal appeal. For Medicaid and Medicaid managed care plans, the window can be much shorter — sometimes as little as 30 days. The denial letter should state the specific deadline. If the deadline isn't clear, call the insurer and ask, then confirm in writing. Missing an appeal deadline usually means losing that level of appeal entirely, so mark every date.

2. What's the difference between an internal appeal and an external review?

An internal appeal is the insurance company reviewing its own denial decision. An external review is handled by an independent third party outside the insurance company — and the external reviewer's decision is binding on the insurer. You must typically go through at least one internal appeal before external review becomes available. External reviews often have better outcomes than internal appeals because the reviewer isn't employed by the insurer.

3. What is a peer-to-peer review and how do I request one?

A peer-to-peer review is a direct conversation between your BCBA and the insurer's clinical reviewer. These reviews often have higher success rates than paper-only appeals because the BCBA can respond to specific concerns in real time. Your BCBA (or you) can request a peer-to-peer review during or after the internal appeal process. The BCBA should go into the call prepared with the insurer's specific medical necessity criteria and point-by-point responses to each one.

4. What is EPSDT and how does it affect my Medicaid appeal?

EPSDT (Early and Periodic Screening, Diagnostic, and Treatment) is a federal Medicaid benefit for children under 21 that requires coverage of medically necessary services — even when the state Medicaid program hasn't explicitly listed them. For Medicaid denials, citing EPSDT and framing the services as medically necessary for the child's development is often the strongest argument. State Medicaid programs sometimes under-apply EPSDT, so parents may need to invoke it explicitly in the appeal.

5. What is Mental Health Parity and how does it apply to ABA?

The federal Mental Health Parity and Addiction Equity Act (MHPAEA) requires insurance plans to cover mental health services (including autism services for most plans) at parity with medical/surgical services. Insurers can't apply stricter medical necessity criteria, more restrictive hour caps, higher copays, or more onerous prior authorization requirements to ABA than they do to comparable medical care. If your plan is treating ABA differently than medical care, you may have a parity violation — enforceable by the U.S. Department of Labor and HHS.

6. When should I file a complaint with the state insurance commissioner?

Consider filing a state insurance commissioner complaint when the insurer appears to be violating state law (autism mandate, parity rules, or appeal process requirements), the insurer is not responding within required timeframes, or you've exhausted internal appeals without a clear or lawful justification. State insurance commissioners can investigate, fine insurers, and order corrective action. The NC Department of Insurance, Georgia Office of Commissioner of Insurance, and Maryland Insurance Administration all have Consumer Services divisions that handle these complaints.

7. Does my state's autism mandate apply to my plan?

It depends on the plan type. State autism mandates (NC's HB 498, Georgia's Ava's Law, Maryland's autism insurance mandate) apply to state-regulated commercial insurance — plans bought on the marketplace, through small employers, or directly from an insurer. They typically do NOT apply to self-funded ERISA plans, which are governed by federal law. Medicaid operates under separate federal rules (EPSDT) that provide strong protections for children under 21. Call your HR department or insurer to confirm what type of plan you have.

8. What should I do if my ABA has been cut off entirely during the appeal?

While the appeal is in progress, work with your BCBA on the strongest possible treatment plan within whatever authorization you still have. If services have been cut off completely, consider: whether you qualify for an urgent appeal (72-hour decision timeline), whether a short-term private-pay bridge is possible, whether complementary therapies (speech, OT) are still covered, and whether state waivers or Medicaid pathways offer an alternative route. Document the gap between what was recommended and what's being provided — if your child's progress is affected, you'll want that evidence for the next appeal.

Sources

1. U.S. Centers for Medicare & Medicaid Services (CMS). Early and Periodic Screening, Diagnostic, and Treatment (EPSDT). https://www.medicaid.gov/medicaid/benefits/epsdt/index.html
2. U.S. Centers for Medicare & Medicaid Services (CMS). The Mental Health Parity and Addiction Equity Act (MHPAEA) Fact Sheet. https://www.cms.gov/CCIIO/Programs-and-Initiatives/Other-Insurance-Protections/mhpaea_factsheet
3. U.S. Department of Labor, Employee Benefits Security Administration. Mental Health Parity Enforcement and Self-Funded ERISA Plans. https://www.dol.gov/agencies/ebsa/laws-and-regulations/laws/mental-health-parity
4. Autism Speaks. State-by-State Health Insurance Coverage for Autism. https://www.autismspeaks.org/health-insurance
5. North Carolina Department of Insurance. Consumer Services Division. https://www.ncdoi.gov/
6. Georgia Office of the Commissioner of Insurance and Safety Fire. https://oci.georgia.gov/
7. Maryland Insurance Administration. Consumer Services. https://insurance.maryland.gov/
8. North Carolina HB 498 (Autism Health Insurance Coverage Law) — current text available via the NC General Assembly website.
9. Georgia Ava's Law — enacted 2015, autism insurance coverage mandate.