Medical Necessity Not Documented

Payers require clinical notes to substantiate the diagnosis severity and functional impairment justifying psychotherapy or psychiatric services. Ensure every session note includes presenting symptoms, clinical assessment, and treatment rationale linked to the primary ICD-10 diagnosis.

Missing or Incorrect Modifier on Telehealth Claims

Mental health telehealth claims for CPT codes 90832-90837 require modifier -GT or -95 depending on the payer; omitting it or using the wrong modifier results in automatic denial. Verify payer-specific telehealth modifier requirements before submitting and append place of service code 02 or 10 as required.

Diagnosis-Procedure Linkage Mismatch

Billing a psychotherapy CPT (e.g., 90837) without a primary mental health ICD-10 diagnosis — or pairing a psychiatric code with a non-qualifying Z-code only — triggers medical review and denial. Always link psychotherapy and psychiatric evaluation codes to a specific F-chapter diagnosis that directly supports the service billed.

Prior Authorization Not Obtained for Ongoing Therapy

Many commercial and Medicaid plans require prior authorization after an initial 6-12 session threshold, and claims beyond that limit are denied if reauthorization was not secured. Track authorization expiration dates proactively and submit reauthorization requests with updated progress notes at least 2 weeks before exhausting approved sessions.