Psychiatric CPT Code Framework
Psychiatric billing relies on a specific set of CPT codes that distinguish diagnostic evaluations, medication management visits, psychotherapy sessions, and combination services. The most common billing errors in psychiatry involve failing to use add-on psychotherapy codes when therapy is provided during a medication management visit, or selecting the wrong E/M level for the complexity of the psychiatric decision-making involved. Understanding the code structure and proper pairing rules directly affects revenue per encounter.
Psychiatric Diagnostic Evaluation (90792)
Code 90792 covers the initial psychiatric diagnostic evaluation with medical services. This includes a comprehensive psychiatric history, mental status examination, review of medications, and development of a treatment plan. Medicare reimburses 90792 at approximately $185 to $200 depending on geographic locality. This code is used for the first visit with a new patient or when a comprehensive re-evaluation is clinically warranted. It should not be used for routine follow-up visits. Documentation must support that the visit included a full diagnostic assessment, not simply a medication check.
E/M Codes for Medication Management (99213-99215)
Follow-up medication management visits use standard E/M codes. Level 3 (99213, approximately $92) covers straightforward medication management: stable patient on a single psychiatric medication with no dosage changes needed. Level 4 (99214, approximately $132) applies to moderate complexity: adjusting medication dosages, managing side effects, switching medications, or addressing comorbid conditions. Level 5 (99215, approximately $193) is appropriate for high complexity: managing multiple psychiatric medications, treating patients with suicidal ideation, coordinating care for treatment-resistant conditions, or making complex pharmacological decisions involving drug interactions.
Most psychiatric medication management visits support level 4 (99214) because the nature of psychiatric prescribing involves ongoing assessment of symptom response, side effect monitoring, and treatment adjustments. Practices that default to level 3 for all follow-ups are consistently underbilling.
Psychotherapy Add-On Codes (90833, 90836, 90838)
When a psychiatrist provides psychotherapy during the same visit as an E/M service, add-on codes capture the therapy component. These codes are billed in addition to the E/M code, not instead of it. Code 90833 covers 16 to 37 minutes of psychotherapy (approximately $58). Code 90836 covers 38 to 52 minutes of psychotherapy (approximately $87). Code 90838 covers 53 minutes or more of psychotherapy (approximately $113). The psychotherapy time is measured separately from the E/M time. A 45-minute visit where 15 minutes involves medication review and 30 minutes involves psychotherapy would be billed as 99214 plus 90833.
These add-on codes are among the most underused in psychiatric billing. Many psychiatrists who spend 10 to 20 minutes on supportive therapy, motivational interviewing, or cognitive techniques during a medication visit do not capture the add-on code because they do not track the psychotherapy time separately.
Electroconvulsive Therapy (90870)
Code 90870 covers electroconvulsive therapy, including the necessary monitoring during the treatment session. Medicare reimbursement is approximately $145 to $160 per session. ECT is typically performed in a series of 6 to 12 sessions for treatment-resistant depression, severe mania, or catatonia. The anesthesia services for ECT are billed separately by the anesthesiologist. The psychiatrist bills 90870 for each treatment session. Documentation should include the clinical indication, treatment parameters, and clinical response tracking.
Interactive Complexity Add-On (90785)
Code 90785 is an add-on for psychiatric services that involve interactive complexity: communication factors that complicate the delivery of the service. Examples include the need for interpreters, involvement of third parties (guardians, probation officers), patients with cognitive impairment that requires modified communication, or the use of play equipment or physical devices to communicate with the patient. This add-on reimburses approximately $15 and is frequently overlooked in practices that treat geriatric psychiatric patients or patients with developmental disabilities.