Getting Autism Therapy Covered by Insurance in Illinois

What Illinois law requires

Illinois's mandate is section 356z.14 of the Insurance Code, at 215 ILCS 5/356z.14, created by Public Act 95-1005 and effective 12 December 2008. Any group or individual accident and health policy or managed care plan must cover the diagnosis and treatment of autism spectrum disorder for people under 21 years of age.

Visits cannot be limited. Dollars can. Both rules live in the same sentence of subsection (b), which is why they get merged so often. Coverage is subject to a maximum benefit of $36,000 per year as written in the statute, and the Director of Insurance adjusts that figure annually for inflation using the medical care component of the Consumer Price Index. The same subsection says coverage shall not be subject to any limits on the number of visits to a service provider. Because the maximum moves every year, ask your insurer for the current inflation-adjusted figure in writing rather than relying on any number you read, here included.

One protection worth quoting: payments the insurer makes for treating a condition not diagnosed as autism may not be counted toward that annual maximum.

Parity on the rest. Subsection (d) says benefits under this section may not carry dollar limits, deductibles, copayments or coinsurance less favorable to you than those applying to physical illness generally.

They cannot drop you, and they cannot object to the setting. An insurer may not refuse, terminate or restrict coverage because someone is diagnosed with autism or because they are using these benefits. Subsection (e-5) goes further and bars denial of otherwise covered services solely because of where the clinically appropriate services are delivered — useful if a plan is refusing therapy provided in the home or the community.

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

Do not assume you need it. This page previously said prior authorization was always required in Illinois, and that is not right. Subsection (f) of the autism section ends by stating that nothing in it supersedes the prohibition on prior authorization for mental health treatment found at 215 ILCS 5/370c(w). If your insurer demands prior authorization for outpatient autism treatment, ask in writing which provision they are relying on.

What the insurer can do under subsection (f) is request medical records, clinical notes or other data substantiating that treatment is medically necessary and producing improved clinical status, and where continued services are anticipated, ask for a treatment plan covering diagnosis, proposed treatment by type, frequency, anticipated duration, goals and how often the plan will be updated.

Either way, keep detailed records. Illinois families who win appeals consistently point to documentation as the deciding 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 appeal with a detailed letter of medical necessity from your child's physician that addresses the stated denial reason directly. Federal rules give you at least 180 days from the denial notice, and the Illinois autism statute sets no 30-day deadline.
3. Ask who is reviewing it. Subsection (g) requires a medical-necessity determination to be made the same way it would be for any other illness, and says that during the appeals process a challenge to medical necessity may be viewed as reasonable only if the review includes a physician with expertise in the most current and effective treatment modalities for autism. Put that question in writing — it is the sharpest Illinois-specific lever on this page.
4. Request external review if the internal appeal fails — Illinois law provides external review rights for fully insured plans.
5. File a complaint with the Illinois Department of Insurance at 1-877-527-9431 if you believe the mandate 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.