ABA Therapy denial code (Updated for 2026)

Common Causes for CO 272

Denials with code CO 272 typically happen for the following specific reasons:

• The provider failed to submit updated ABA treatment plans and progress reports before the existing authorization window expired.
• The patient's insurance coverage terminated or changed during the authorized treatment period, leading to a retroactive loss of coverage.
• The rendered ABA therapy units (such as CPT 97153 or 97155) exceeded the specific hours or frequency limits approved in the active authorization.
• The provider did not satisfy the payer's mandatory periodic clinical review or case management contact requirements to justify continued medical necessity.

How to Prevent CO 272 Denials

To avoid receiving this denial in the future, implement these specific checks:

• Establish a proactive tracking system to flag ABA authorization expiration dates and unit utilization limits at least 30 days in advance.
• Perform monthly eligibility and benefits verification for all active ABA patients to identify coverage terminations or transitions immediately.
• Submit comprehensive clinical re-evaluations, standardized assessment scores, and updated goals to the utilization management team well before the current authorization lapses.
• Train clinical and billing staff on payer-specific ABA guidelines regarding mandatory supervision ratios and maximum allowable weekly hours.

Appeal Letter Template for CO 272

If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.

[Your Practice Header]
[Date]

[Payer Name]
[Appeals Department Address]

RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO 272 - ABA Therapy denial code

Dear Appeals Department,

I am writing to appeal the denial of the above-referenced claim, which was denied with code CO 272: "ABA Therapy denial code".

We are appealing the denial of the enclosed claim for Applied Behavior Analysis (ABA) therapy services under denial code CO 272. The services rendered to the patient were medically necessary, highly beneficial, and aligned with the established, evidence-based treatment plan for Autism Spectrum Disorder (ASD). The clinical documentation attached demonstrates that the provider consistently monitored the patient's progress and maintained the required documentation standards outlined by the AMA CPT coding guidelines for Adaptive Behavior Services. Any perceived lapse in authorization or communication was administrative in nature and did not impact the medical necessity of the ongoing, daily interventions required to prevent developmental regression. We respectfully request a retrospective clinical review and approval of these claims based on the attached clinical notes and treatment efficacy data.

Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].

We respectfully request that you reprocess this claim for payment.

Sincerely,

[Your Name]
[Title]
[Practice Name]