Most ABA Falls Outside the Medicaid 80/20 Rule

The Medicaid provision that has unsettled the home care industry for two years does not reach most ABA. The 80/20 rule, the most-debated piece of the federal Ensuring Access to Medicaid Services rule, requires agencies to spend at least 80% of certain Medicaid payments on the workers who deliver the care. It applies to three service categories: homemaker, home health aide, and personal care. ABA is billed under none of them.

The distinction matters because the rule has caused real worry. Provider groups warned that an 80% floor leaves too little for administration, supplies, and overhead, and a House bill sought to bar federal health officials from finalizing it. For autism providers the question is narrower: does a rule built for home care reach ABA at all? For the bulk of it, the answer is no, with specific exceptions worth knowing.

What the 80/20 Rule Actually Covers

CMS published the Ensuring Access to Medicaid Services rule, known as CMS-2442-F, on May 10, 2024, and it took effect on July 9, 2024. The pass-through requires providers of homemaker, home health aide, and personal care services to spend at least 80% of their Medicaid payments on direct care worker compensation, defined as wages, benefits, and the employer share of payroll taxes. Training, travel, and protective equipment are excluded from the math. Clinical supervisors count as direct care workers.

The requirement reaches services authorized under section 1915(c), (i), (j), and (k) waivers and section 1115 demonstrations. It does not extend to facility-based or clinical services, and it does not apply to services paid under the Medicaid state plan, the section 1905 authority. The timeline is long. States must begin reporting compensation percentages within four years, and the 80% floor is not enforced until 2030.

Why Most ABA Sits Outside It

Medicaid covers ABA primarily through Early and Periodic Screening, Diagnostic, and Treatment, or EPSDT, the benefit that entitles enrollees under 21 to any medically necessary service. For more than a decade, CMS has told states that medically necessary treatment for autism, including ABA, must be covered for children under EPSDT, an entitlement rooted in section 1905(r) of the Social Security Act. That is the clinical, state-plan side of Medicaid, not the home-care side the 80/20 rule was written for.

Two features of the rule reinforce the line. CMS said the pass-through does not apply to clinical services, and it does not apply to anything paid under section 1905. ABA delivered as a medical benefit, billed under the adaptive behavior CPT codes and supervised by a BCBA, is both. The pass-through follows the service category a state uses to define and pay for the care, not the diagnosis behind it.

Where the Line Gets Blurry

The exception is autism care delivered through Home and Community-Based Services (HCBS) waivers. Most states run section 1915(c) waivers that fund services for children and adults with autism in home and community settings, and depending on the state those can include ABA, respite, and personal care. Here the label a state chose starts to matter.

Whether the Access Rule touches an autism provider turns on how a state classifies the service, not on what happens in the therapy room.

If a state pays for a waiver service as personal care, that service sits squarely inside the 80/20 pass-through. If it pays for autism supports as habilitation, the result changes: habilitation carries the rule’s rate-reporting and disclosure duties but not the 80% compensation floor, which CMS confined to homemaker, home health aide, and personal care. The rule’s own definition of a direct care worker includes staff who provide “behavioral supports,” a sign that waiver-funded autism services can land in the reporting net even where ABA billed as a medical benefit does not.

The Part Every Provider Will Feel

Providers fully clear of the pass-through are still not clear of the Access Rule. Its payment-rate transparency requirement takes effect July 1, 2026, and it is broad. By that date every state must publish its Medicaid fee-for-service payment rates for nearly all providers and services on a public website, then update them within 30 days of any rate change. ABA rates paid under the state plan are included. Rates that differ by provider type, by geography, or between pediatric and adult populations must be listed separately.

A second disclosure aimed at home care requires states to publish average hourly Medicaid rates for personal care, home health aide, homemaker, and habilitation services, also by July 1, 2026, using rates that were in effect a year earlier. For autism providers the practical message is the same either way: even where the pass-through does not apply, state ABA rates are about to become public in a standardized form, and any waiver service classified as habilitation will appear in the HCBS rate tables.

What Is Still in Flux

The rule’s future is not settled. The 2025 budget reconciliation law left the 80/20 provision in place, after the Congressional Budget Office found that repealing it would not save money and so could not ride that bill. CMS has since pushed back enforcement on adjacent pieces, delaying the interested-parties advisory group to January 2029 and the HCBS grievance-system requirement to the end of 2027. Home-care groups continue to press for an administrative repeal of the pass-through itself.

The transparency deadline is the near-term one. States must post their rate schedules, ABA included, by July 1.

AT A GLANCE

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