Humana's Oklahoma ABA Assessment Caps Started September 16. Six Ways Past Them.

On September 17 we reported Humana Healthy Horizons capping initial 97151 at 24 units and reassessment at 16, and noted OHCA's approval list gave no effective date. Humana has now issued its own policy. It started eleven days ago, and it names six ways to exceed the cap.

Humana Healthy Horizons has published a Medicaid coverage policy for ABA in Oklahoma, HUM-OK-2663-000. Original effective date and effective date are both September 16, 2026. It is listed first under “Active clinical coverage policies” on Humana's Oklahoma provider page.

The turn: this is the date we said was missing

On September 17 we reported that OHCA had approved all three SoonerSelect plans to run assessment limits tighter than the state rule, and that Humana's numbers — 24 units initial, 16 units on reassessment — came with no effective date on OHCA's list. The policy supplies it, and it has already passed.

Nothing about the caps has changed. What is new is that Humana has now written down what it will accept as a reason to exceed them, and it is a closed list.

The caps, and the six ways out

The policy adopts the state manual and adds to it: “We follow state manual PART 30. APPLIED BEHAVIOR ANALYSIS (ABA) SERVICES, in addition the following criteria apply.” Initial 97151 is “up to 24 units (6 hours).” Reassessment, billed 97151-TS, is “up to 16 units (4 hours) every 6 months.” Requests may exceed either “for complex cases when the exception criteria are met.”

The exception criteria, each requiring its own documentation:

  • Regression or worsening in skills or functioning — explicitly “not explainable by a lack of effective treatment protocols” — shown by loss of acquired skills, rapid deterioration, or dangerous behaviors, plus documented protocol changes during the authorization period.
  • Comorbid conditions affecting complexity, where the co-occurring condition sits “outside the spectrum of diagnosis typically occurring within the ASD spectrum,” and interferes with engagement, requires specialized protocol development, or complicates assessment.
  • Major treatment changes requiring intensive clinical oversight — non-typical transitions between home, a new school, hospital or foster placement; a new behavior intervention plan; significant caregiver changes.
  • Severe behaviors posing safety risks, with “specific instances and frequency including critical incidents reports.”
  • Cultural or linguistic barriers necessitating interpreter support.
  • Coordination across multiple informants or systems.

The last two are worth naming because most payers do not treat them as assessment-unit drivers at all. If an interpreter is in the room, Humana now says that is a reason the assessment takes longer.

EPSDT survives: “For members under age 21, requests are reviewed for medical necessity in accordance with Early and Periodic Screening, Diagnostic and Treatment (EPSDT) requirements.”

The limits

The coding table lists only 97151, 97153, 97155 and 97156. It does not list 97152, 97154, 97157 or 97158, and the policy does not say what happens to them. The change summary reads “05/05/2026 New Policy. Version 000,” so there is no prior version to diff against. And this binds Humana members only — fee-for-service SoonerCare still runs on OAC 317:30-5-311 and -314.

What you must know or do

  • Pull every Humana Healthy Horizons 97151 and 97151-TS you have billed since September 16 and check the units against 24 and 16. Anything above needs one of the six categories in the record.
  • Rewrite your assessment-extension template around the six headings. Each one has a documentation clause attached; a general statement of complexity satisfies none of them.
  • If you use an interpreter, say so in the request. It is now a named exception category at this plan, and it is not one at most others.
  • Diary the reassessment clock at six months per member. The 16-unit allowance is per six-month period, not per request.