Getting Autism Therapy Covered by Insurance in Illinois

Illinois's ABA insurance mandate

Illinois Public Act 95-1005 requires all Illinois-regulated health insurance plans to cover ABA therapy for autism spectrum disorder through age 21. There is no dollar cap on covered services — plans must cover all medically necessary therapy hours.

Coverage ends at age 21:Illinois's mandate applies through the individual's 21st birthday. Families approaching that transition should explore Medicaid waiver options and adult disability services before coverage under the mandate ends.

Who qualifies: individuals under 21 with an autism diagnosis, with ABA therapy prescribed as medically necessary by a licensed physician or psychologist.

ERISA exemption:self-funded employer plans are generally exempt from Illinois's mandate under federal ERISA law. Confirm your plan type with HR.

Prior authorization in Illinois

Prior authorization is required for ABA therapy in Illinois even with the state mandate in place. The most important practice for Illinois families: keep detailed records of everything. Illinois families who successfully appeal denials consistently point to their documentation as the key factor.

What to document:

• Every prior auth submission — date, confirmation number, documents included
• Every authorization approval — dates, authorized hours, expiration date
• Every denial — the denial letter, the stated reason, the date received
• Every phone call with your insurer — date, representative name, what was said

Request everything in writing, even when told something over the phone. A paper trail is your strongest asset in an Illinois insurance dispute.

Appeals

If your Illinois insurer denies ABA coverage or prior authorization:

1. Request the denial reason in writing immediately — insurers are required to provide one.
2. File a written internal appealwithin 30 days. Include a detailed letter of medical necessity from your child's physician that directly addresses the stated denial reason.
3. Request external review if the internal appeal fails — Illinois law provides external review rights for fully insured plans.
4. File a complaint with the Illinois Department of Insurance at 1-877-527-9431 if you believe Public Act 95-1005 is being violated.

Illinois Medicaid

Illinois Medicaid covers ABA therapy for individuals under 21. Coverage is administered through managed care organizations (MCOs) for most Medicaid recipients in Illinois. Your MCO has its own prior auth process — contact your plan's member services to understand what's required.

Enrollment: apply for Illinois Medicaid through the Illinois ABE portal at abe.illinois.gov or contact your local DHS Family Community Resource Center. Children with disabilities may qualify through SSI-linked Medicaid.

Medicaid and private insurance: if your child has both private insurance and Medicaid, private insurance is billed first and Medicaid covers remaining costs. This can reduce or eliminate out-of-pocket expenses for families with dual coverage.