CareSource Ohio Won't Accept an ABA Claim Without the Treatment Record

CareSource's Ohio Medicaid reimbursement policy for ABA, OH MCD-PY-1638, took effect September 1, 2026. The Ohio Department of Medicaid approved it on June 5. Its first rule comes before any coding question: the member's treatment record “must be completed by the provider or practitioner and submitted to CareSource prior to claim submission. Claims will not be accepted without accompanying treatment documentation.”

That means plans of care, treatment plans, behavior support plans and functional assessments. A first claim sent before the record has arrived isn't denied for medical necessity. It isn't accepted at all.

The turn: this is the CPST problem, from the plan side

When Ohio Medicaid revived its ABA rule in July, its own data showed ABA being billed under behavioral health rehabilitation codes, rising to $136.2 million in 2025. CareSource's policy answers that directly. H0036, the CPST code, won't be reimbursed “if the provider is able to use designated ABA codes.” CareSource promises “a continued and uninterrupted path” for providers moving off H0036, but not for anyone who can already bill the ABA codes.

What else the policy says

• Assessment: by a BCBA, “generally, not to exceed 6-10 hours every 6 months unless additional justification is provided.”
• RBT supervision: at least 5% of the RBT's ABA hours each month. Records are kept for five years.
• When the supervisor leaves: if the supervising independent practitioner leaves the organization, “the RBT may not continue to provide services under that independent practitioner.”
• Claim format: one date of service per claim line. Units are daily totals, and a unit counts once the midpoint of 15 minutes is passed.
• Not billable: concurrent OT, PT or speech; prep and cleanup; rest, toileting and breaks; documentation alone.
• Telemedicine: paid the same as in person, under the same limits.
• Enforcement: post-payment analysis, record audits, overpayment recovery, prepayment review and an annual Program Integrity review.

CareSource writes separate ABA policies by state. Its Georgia and Mississippi policies took different approaches.

The limits

The policy doesn't say how the record is to be submitted or how far in advance. The 6–10 hour assessment figure is “generally,” with an exception for justification. A reimbursement policy defers to the provider agreement where the two conflict.

What you must know or do

• Billers: pull every CareSource Ohio ABA claim rejected since September 1 and check whether the treatment record had been sent. For new members, don't release the first claim until the record's receipt is confirmed.
• Owners: if any ABA is still billed as H0036 to CareSource, move it to the 9715x codes now, and document why for any service that can't be.
• Clinical directors: when a supervising BCBA leaves, name the new supervisor in writing before the RBT's next CareSource session. Check monthly that each RBT's supervision reached 5%.
• Billing setup: split any multi-date claim lines, and round units by the midpoint rule.