How OTA Participation Changes a Medicare Claim
Supervision does not answer every billing question
An occupational therapy assistant provides treatment under an OT's supervision. The practice records the care correctly but submits every claim with the same modifier setup used for visits performed entirely by the OT. That default needs review.
CMS uses CO to identify applicable outpatient OT services furnished wholly or partly by an OTA, paired with the GO therapy modifier. For covered services subject to the assistant payment adjustment, Medicare pays 85 percent of the otherwise applicable Part B payment. The payment change took effect January 1, 2022; it is not a new 2026 reduction. [1]
The practice needs to know who performed the service as well as who supervised it.
Retain the information needed for the calculation
CMS's rules address services performed independently by an assistant and portions exceeding its 10 percent de minimis standard. Its examples include exceptions and specific treatment of timed units. Do not reduce that guidance to a rule that any assistant involvement requires CO on every line. [1]
Document the OT and OTA contributions clearly enough to apply the relevant billing method. When a visit includes work by both, a total appointment duration without the necessary attribution can leave the billing team unable to determine which lines need the modifier.
For example, an OT may perform one part of the encounter while an OTA performs another. Review the actual services and timing. The presence of an OT signature does not establish that the OT personally furnished all the treatment.
Check payer rules and software defaults
Keep Medicare's assistant rules separate from state supervision requirements and commercial payer agreements. Each can affect the arrangement, and satisfying one does not establish compliance with the others.
Set up the EHR and billing workflow so assistant involvement reaches the claim review. Test whether the software can handle encounters with different contributions instead of attaching a fixed modifier solely from the appointment label.
Compare a sample of submitted claims with the treatment record and remittance. If the practice finds an error, determine the correct reporting and correction process. Do not remove a supported assistant modifier simply because the resulting payment is lower.
Patients should be told who will provide their care and how the team works. The practice also needs to understand the payment model when planning staffing and capacity. Accurate attribution supports both decisions and keeps a legitimate assistant arrangement from becoming an avoidable claims problem.
Comments