Indiana Stops Paying for Adult ABA in About Five Weeks. The 4,000-Hour Lifetime Cap Already Started.

Indiana's Medicaid ABA overhaul took effect April 1, 2026 through bulletins BT202627 and BT202646. Most of the coverage at the time focused on the rate cuts. The provision with a countdown attached to it got less attention, and it runs out in about five weeks.

ABA is now EPSDT-only, and EPSDT stops at 21

The Indiana Health Coverage Programs now covers ABA exclusively through Early and Periodic Screening, Diagnostic and Treatment. Under federal law EPSDT is available only to Medicaid-eligible individuals under 21 years of age. Members 21 and older who were already receiving ABA got a six-month transition window opened at April 1, 2026, after which, in Hall Render's reading of the bulletin, the state will "no longer authorize or reimburse ABA therapy services for members over age 21."

One caution on the exact last day: Hall Render describes reimbursement running through October 1, 2026, while IHCP bulletin language describes the transition window as April 1 through September 30, 2026. Those differ by a day and the difference is a real authorization. Confirm the date against BT202627 directly before you tell a family anything.

Either way: if you carry Indiana Medicaid members over 21, the coverage ends this fall, and discharge or private-pay conversations should already be underway.

A lifetime cap that ignores what you already delivered

Effective April 1, 2026, Indiana applies a 4,000-hour lifetime cap on ABA services. The detail that matters operationally is that it applies to all individuals regardless of hours received before the cap took effect. Members who exhaust the limit may access an additional 15 hours weekly where medically necessary.

Weekly caps also now vary by member diagnosis rather than running on a single ceiling.

Rates: 6 percent down, another 4 percent queued

• April 1, 2026 — maximum fee rates cut 6 percent for non-group ABA services.
• April 1, 2027 — an additional 4 percent reduction applied across all ABA therapy procedure codes.

The second cut is already scheduled. It is not contingent on a further rulemaking.

Accreditation: the first deadline has passed

Beginning October 1, 2027, IHCP will require all newly enrolled and existing ABA group enrollments to be accredited, recognizing the Autism Commission on Quality (ACQ) or the Behavioral Health Center of Excellence (BHCOE). Currently enrolled ABA groups had to submit documentation showing they had initiated the accreditation process by August 1, 2026 — three weeks ago.

If that submission did not go in, it is worth confirming your enrollment status now rather than discovering it at revalidation.

Why this is worth watching from outside Indiana

Indiana is one of the states CMS's August 4 ABA toolkit is written for, and its package — EPSDT-only scoping, a lifetime cap, diagnosis-tiered weekly caps, staged rate cuts, mandatory third-party accreditation — is the most complete version of the toolkit's menu any state has enacted. Practitioners in states now writing ABA policy are looking at a working draft of what is coming.

It is also, for the moment, the state where the widest gap sits between what CMS says ABA should be measured on and what the benefit will actually pay for.