What to Do If Your Colorado Insurance Denies ABA Therapy
The letter arrives, and your stomach drops. "Coverage denied." After months of waiting for an autism diagnosis, navigating specialist referrals, finding an ABA provider, and finally getting your child's treatment plan in place — the insurance company has said no.
Here's what you need to know: a denial is not a final answer.
Colorado law gives families specific, layered rights to challenge insurance denials for ABA therapy. The process has real teeth — including mandatory internal reviews, independent external review by a third party, regulatory complaint channels, and escalation options that go beyond the insurance company entirely. Families in Denver, Aurora, Lakewood, and across Colorado navigate this process successfully every year.
Here's the direct answer: When your Colorado insurance denies ABA therapy, the immediate steps are:
- read the denial letter to understand the specific reason
- gather documentation to address that reason
- file a formal internal appeal within the deadline stated in the denial letter (typically 180 days for individual plans)
- request a peer-to-peer review between your BCBA and the insurer's medical reviewer
- if the internal appeal fails, request an independent external review through the Colorado Division of Insurance
- file a complaint with the Colorado Division of Insurance or the Behavioral Health Ombudsman if the insurer is not complying with state law. Colorado also protects ABA therapy through the Mental Health Parity laws, meaning insurers cannot apply stricter coverage standards to behavioral health services than they apply to medical or surgical services.
Why Colorado Insurance Denies ABA Therapy — And Why It Often Shouldn't
Understanding why the denial happened is the most important first step. The reason code in the denial letter determines your entire appeal strategy.
The most common reasons Colorado insurance companies deny ABA therapy claims include:
- "Not medically necessary" — This is the most frequent denial reason. The insurer's medical reviewer determined that ABA therapy doesn't meet their specific medical necessity criteria based on the documentation submitted. This is often reversible with the right documentation and a peer-to-peer review.
- Prior authorization not obtained — Services began before the prior authorization was approved, or the prior authorization request was missing required documentation. This can often be resolved by submitting corrected documentation.
- Out-of-network provider — The ABA provider is not in the insurer's network. Colorado's network adequacy rules may offer protection here, particularly if no in-network provider was available in reasonable proximity or timeframe.
- Coding error — Incorrect CPT or procedure codes on the claim. This is a technical error that can typically be resolved by submitting a corrected claim.
- Service exceeds authorized hours — More hours of therapy were provided than were authorized in the prior approval. A new prior authorization request for additional hours is required.
- Experimental or investigational — The insurer claims ABA is experimental. Under Colorado's autism insurance mandate (SB 09-244/SB 15-015), ABA therapy cannot be denied on this basis for covered plans. This claim is legally untenable under Colorado law for fully insured plans.
- Not every denial is legitimate. A 2013 American Medical Association study found that 7.1% of paid health insurance claims contained billing errors — meaning errors that lead to denials are common, and correctable.
Colorado Insurance Denied
ABA Therapy?
A denial is not a final answer. Colorado law gives you layered rights to challenge every ABA therapy denial — from peer-to-peer review through binding external review.
Step 0 — Identify your denial reason. Click the reason that matches your denial letter. Understanding the specific reason determines your entire appeal strategy.
Check off each document as you gather it. A strong appeal requires all of these. Your ABA provider should help supply most of the clinical documentation.
📧 DORA_Insurance@state.co.us
🌐 doi.colorado.gov/for-consumers/file-a-complaint
📧 ombuds@bhoco.org
🌐 behavioralhealthombudsman.colorado.gov
🌐 colorado.gov/PEAK (submit appeal online)
📞 Contact your Medicaid RAE for PAR appeals
Decision within 45 days.
Expedited review available for urgent cases.
Stop staring at that denial letter.
Let's turn it into a start date.
We handle peer-to-peer reviews, maintain your clinical documentation, and support the appeal process. One call — we take it from there.
Sources: Colorado Revised Statutes § 10-16-113.5 (Justia); Coverage Rights — Colorado; Colorado Division of Insurance;
Colorado Behavioral Health Ombudsman; My Patient Rights Colorado; Bright Pathways ABA; Magnet ABA.
Inclusive ABA · inclusiveaba.com · Serving Denver, Aurora, Lakewood, Littleton, Arvada, Thornton, Westminster, Englewood.
Step 1: Read the Denial Letter — Every Word
The denial letter is your roadmap.
Colorado law requires your insurer to notify you of a coverage denial in writing within specific timeframes: 15 days if you're requesting prior authorization for treatment, and other defined timeframes depending on the type of claim.
The denial letter must contain:
- The specific reason for the denial
- The medical necessity criteria the insurer used
- The deadline for filing an appeal
- Instructions for how to file the appeal
- Information about your right to an external review
Read the denial reason carefully. Write down the exact language used. This language will appear in your appeal letter and directly address the insurer's stated concern. If the denial reason is unclear, call the member services number on your insurance card and ask for a written explanation of exactly what medical necessity criteria your claim did not meet.
Keep a record of every conversation: the name of the representative, the date, time, and a confirmation number for the call.
Step 2: Gather Your Documentation — Before You Write a Word
A strong appeal requires specific documentation. Assemble these before drafting anything:
- Your child's formal autism diagnosis from a licensed psychologist, developmental pediatrician, or equivalent. This is the clinical foundation of any ABA coverage claim.
- The BCBA's functional behavior assessment (FBA) — the standardized assessment identifying your child's behavioral challenges, communication deficits, and skill targets.
- The individualized treatment plan — written by the supervising BCBA, specifying goals, session hours, intervention approaches, and measurable outcomes.
- Progress data and session notes — if your child has already received ABA therapy, data showing improvement provides evidence of medical necessity for continued services.
- A letter of medical necessity from your child's physician or the evaluating psychologist — explicitly stating that ABA therapy is medically necessary for your specific child's specific condition and needs.
- Any peer-reviewed research supporting ABA as an evidence-based treatment for autism. The American Psychological Association and the U.S. Surgeon General have both recognized ABA as an evidence-based practice. Citing this can directly counter an "experimental" denial.
- The insurer's own medical necessity criteria — request this document from your insurer. Under Colorado law, insurers must provide their medical necessity criteria upon request. Your appeal should specifically address each criterion the insurer claims was not met.
Families in Thornton and Westminster working with Inclusive ABA don't have to gather all of this alone — our team maintains the clinical documentation and supports the appeal process as part of our services.
Step 3: Request a Peer-to-Peer Review First
Before filing the formal appeal, request a peer-to-peer review.
A peer-to-peer review is a direct conversation between the BCBA or your child's physician and the insurer's medical reviewer who made the denial decision. This step is not always widely advertised, but it is one of the most effective ways to resolve a "not medically necessary" denial quickly.
During a peer-to-peer review:
- Your BCBA presents the clinical rationale for the specific number of hours requested
- The insurer's reviewer can ask clinical questions directly
- Many denials are overturned at this stage without requiring a formal written appeal
Ask your ABA provider whether they can initiate a peer-to-peer review on your behalf. At Inclusive ABA, our BCBAs are experienced with this process and routinely advocate for families whose prior authorization requests are denied or reduced.
Step 4: File the Formal Internal Appeal
If the peer-to-peer review doesn't resolve the denial, file the formal internal appeal.
Colorado requires insurers to conduct a full and fair review of every denial. Under Colorado Insurance Regulation 3 CCR 702-4, carriers must avoid conflicts of interest and ensure that benefit reviews are adjudicated impartially — meaning the reviewer of your appeal must not be the same person who made the original denial decision.
Timelines for filing an internal appeal:
- For individual plans: typically up to 180 days from the date of the denial letter
- For Medicaid (Health First Colorado) PAR denials: 30 calendar days from the date of the denial letter.
What to include in your appeal:
- A clear, direct appeal letter identifying the claim, the denial reason, and why that determination is incorrect
- All documentation gathered in Step 2
- Specific reference to the insurer's medical necessity criteria — addressing each one individually
- Reference to Colorado's autism insurance mandate (SB 09-244/SB 15-015) if the denial was on "experimental" grounds
- Reference to the Mental Health Parity Act if you believe behavioral health services are being held to a stricter standard than comparable medical services
First-level internal review: A physician not involved in the original denial reviews your appeal. Colorado law requires a written decision within 30 days of your appeal request.
Second-level internal review: If the first-level appeal is denied, you may request a second-level voluntary review. A meeting is scheduled within 60 days, and your healthcare provider may speak on your behalf directly with the review panel. Colorado law requires a decision within 7 days after this meeting.
Keep copies of everything you submit, every decision letter received, and every communication with the insurer.
Step 5: Request an Independent External Review
If both internal appeal levels are exhausted, Colorado law gives you the right to an independent external review.
Under Colorado Revised Statutes § 10-16-113.5, an individual can request an independent external review of an insurer's adverse determination. The Colorado Division of Insurance (or its contractor) selects an independent external review entity — completely separate from the insurance company — to evaluate the denial.
Key facts about external review in Colorado:
- You must request external review within four months after receiving the internal appeal denial notification
- The insurer must inform you of your right to external review in the internal appeal denial notification
- External review decisions are binding on the insurance company
- The health plan must make a decision on external appeals within 45 days of the request
For urgent situations: If waiting 30–60 days would seriously jeopardize your child's life or ability to regain function, you can request an expedited external review, which can run concurrently with an expedited internal appeal.
The independent reviewer is required to be an expert in the medical condition and treatment in question. If either party disagrees with the external review decision, they can challenge it in court.
Step 6: File a Complaint With the Colorado Division of Insurance
If your insurer is not following proper appeal procedures, is applying stricter standards to ABA therapy than to comparable medical services, or continues to deny coverage you believe is mandated by Colorado law, file a complaint with the Colorado Division of Insurance (DOI).
Contact information:
- Phone: 303-894-7490 / 800-930-3745
- Email: DORA_Insurance@state.co.us
- Online: doi.colorado.gov/for-consumers/file-a-complaint
The Division regulates fully insured plans in Colorado and has enforcement authority over the autism insurance mandate and mental health parity laws. If your plan's insurance card says "CO-DOI," it is regulated by the Division and subject to these additional enforcement protections.
For behavioral health parity violations specifically — the Colorado Behavioral Health Ombudsman offers a dedicated channel:
- Website: behavioralhealthombudsman.colorado.gov
- Phone: 303-866-3083
- Email: ombuds@bhoco.org
The Ombudsman interacts with consumers and healthcare providers to help resolve behavioral health care access and coverage issues, and can help identify if your insurer's ABA denial constitutes a mental health parity violation.
Medicaid (Health First Colorado) Denials: Different Process
If your child is covered by Health First Colorado (Colorado Medicaid) and the Prior Authorization Request (PAR) is denied, the process differs from private insurance.
For Medicaid PAR denials:
- You have the right to appeal
- The appeal must be submitted within 30 calendar days of the date of the denial letter
- You can request an appeal through the Colorado PEAK system, by mail, or in person at a local Medicaid office
- If the appeal is denied, you can request a hearing with an Administrative Law Judge
- Medicaid typically responds to appeals within 30–90 days
Documents to gather for a Medicaid appeal include proof of your child's autism diagnosis, the BCBA's treatment plan, letters from healthcare providers, and any missing documentation that was not included in the original PAR submission.
For families in Arvada, Englewood, and Littleton using Health First Colorado, Inclusive ABA handles the PAR submission and can assist with the appeal documentation process.
What Colorado's Mental Health Parity Law Means for ABA Denials
Colorado's Behavioral Health Care Coverage Modernization Act (HB19-1269) strengthened the state's mental health parity protections in 2019. Colorado's parity law requires that behavioral health services — including ABA therapy — cannot be subject to more restrictive coverage limitations than comparable medical or surgical services.
In practice, this means:
- Insurers cannot impose stricter prior authorization requirements on ABA than on comparable medical services
- Insurers cannot apply lower reimbursement rates to ABA than to equivalent medical services
- Insurers cannot cap the number of ABA visits if they do not cap comparable medical visits
- Any coverage limitation must be consistent with how the same limitation is applied to medical/surgical benefits
If you believe your ABA denial involves a parity violation — for example, your insurer requires documentation for ABA that it doesn't require for physical therapy — the Colorado Division of Insurance and the Behavioral Health Ombudsman are the appropriate channels for that complaint.
A Real-World Example: Two Families Navigating Denials in Colorado
Family A, Aurora: Received a denial citing "not medically necessary" for 25 hours per week of ABA. Their BCBA requested a peer-to-peer review with the insurer's medical reviewer, presenting functional behavior assessment data showing daily self-injurious behavior and a nonverbal communication profile. The prior authorization was approved for 20 hours within 10 days of the peer-to-peer — without requiring a formal written appeal.
Family B, Denver: Denied coverage based on the insurer classifying ABA as "experimental." Their ABA provider notified them that this denial is legally untenable for fully insured plans under SB 09-244. The family filed a formal internal appeal citing the Colorado autism insurance mandate and the U.S. Surgeon General's recognition of ABA as evidence-based. The first-level reviewer reversed the denial within 28 days. Services began within 6 weeks of the original denial.
These scenarios are consistent with how the appeals process works in practice: persistence, documentation, and knowing which legal protections apply to your plan type.
Conclusion: "No" Is the Beginning of the Conversation
When Colorado insurance denies ABA therapy, it is easy to feel like the system has shut a door. It hasn't. Colorado law has built multiple checkpoints specifically to ensure families can challenge denials, escalate to independent reviewers, and hold insurers accountable to the state's autism and parity mandates.
The key is knowing the steps and moving quickly — deadlines matter in this process.
At Inclusive ABA, navigating insurance isn't something you do alone. We handle prior authorization, support peer-to-peer reviews, maintain the clinical documentation your appeal will need, and work through the process with you from denial to approval. We've done it before. We know what works.
Stop staring at that denial letter and start the process. Call Inclusive ABA today — one conversation with our team clarifies exactly what happened, what your options are, and what we can do together.
Contact Inclusive ABA now — let's turn that denial into a start date. Serving families across Colorado!
📍 Serving Families Across Colorado
Inclusive ABA provides home-based ABA therapy throughout Colorado with no waitlist — including Denver, Aurora, Lakewood, Littleton, Arvada, Thornton, Westminster, and Englewood. All insurance accepted.
Frequently Asked Questions
What should I do first if my Colorado insurance denies ABA therapy?
Read the denial letter carefully to identify the specific reason for the denial. Then contact your ABA provider to request a peer-to-peer review — a direct clinical conversation between your BCBA and the insurer's medical reviewer. This step resolves many "not medically necessary" denials without requiring a formal written appeal. Gather documentation (diagnosis, FBA, treatment plan, letters of medical necessity) before drafting any appeal.
How long do I have to appeal an ABA therapy denial in Colorado?
For individual private insurance plans, you typically have up to 180 days from the date of the denial letter to file an internal appeal. For Health First Colorado (Medicaid) PAR denials, the deadline is 30 calendar days from the denial letter. The deadline is specified in your denial letter — do not miss it.
Can my Colorado insurance legally deny ABA therapy as "experimental"?
Not for fully insured plans subject to Colorado's autism insurance mandate. Under SB 09-244 (effective 2010) and SB 15-015 (effective 2017), covered ABA services cannot be denied on the basis that they are experimental or investigational. If you receive this denial reason, cite the Colorado autism insurance mandate in your appeal. ABA is also recognized as an evidence-based practice by the U.S. Surgeon General and the American Psychological Association.
Sources
- https://coveragerights.org/colorado/
- https://www.robinsonandhenry.com/colorado/disability/fighting-insurance-claim-denial/
- https://www.cde.state.co.us/cdesped/ta_fba-bip
- https://managedcarelegaldatabase.org/state-law/702-division-of-insurance-3-ccr-702-4-life-accident-and-health-2/
- http://mypatientrights.org/file-a-complaint/colorado/
- https://law.justia.com/codes/colorado/title-10/health-care-coverage/article-16/part-1/section-10-16-113-5/
- https://cohealthinitiative.org/articles/co-division-of-insurance-what-it-means-for-you/
- https://doi.colorado.gov/insurance-products/health-insurance/consumer-resources/mental/behavioral-health-and-insurance
- https://hcpf.colorado.gov/par
- https://leg.colorado.gov/bills/hb19-1269
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