How to Avoid Common Billing Audit Triggers

The following common submissions are the most likely to trigger a review or audit:

The “90837” Overuse Flag: CPT 90837 (60-minute psychotherapy) is the highest-reimbursing standard therapy code and remains the #1 audit target. The Trigger: Billing 90837 for every session. Payers compare your billing distribution to your peers. If 90% of your claims are 90837 while the peer average is 40%, you are flagged.

Audit Risk: Auditors look for the “Midpoint Rule.” To bill 90837, the session must last at least 53 minutes. If your note says “50 minutes” or “1 hour” but doesn’t show start/stop times, they may recoup the difference between 90837 and 90834.

“Cloned” or Boilerplate Documentation: Modern AI auditing tools are highly effective at detecting “cloned” notes where the same text is copied from previous sessions or other patients. The Trigger: Identical “Progress” sections across multiple dates of service. The Audit Risk: If the documentation doesn’t show a dynamic evolution of the treatment plan or the patient’s specific response to interventions that day, the payer may deem the services “not medically necessary” and demand a full refund.

Telehealth & Modifier Mismatches: The Audit Risk: Incorrect Place of Service (POS) codes. For patients at home, POS 10 is now standard; using POS 11 (Office) for a remote session is considered fraudulent billing of a facility-level service.

Improper “Incident-To” Billing: The Trigger: Billing 100% of services under a supervisor’s NPI when the supervisor was not in the office (or reachable via video for “direct supervision”) during the session. The Audit Risk: Failure to document the supervisor’s involvement in the initial treatment plan and their ongoing review of the case.

Lookbacks: In 2026, insurers are increasingly using multi-year lookbacks. They may request records for claims dating back 3–5 years to check for “cloned” notes or lack of medical necessity.

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