Mental health professionals rely on accurate billing codes to ensure proper reimbursement for their services. Among the most frequently used codes is CPT Code 90791, which pertains to psychiatric diagnostic evaluations. Unlike therapy codes, this one focuses on the initial assessment phase, where clinicians gather comprehensive patient histories, assess mental status, and formulate treatment plans.
Understanding CPT 90791 is crucial for psychiatrists, psychologists, licensed clinical social workers (LCSWs), and other mental health providers. Misuse can lead to claim denials, audits, or compliance issues. This guide will explore every aspect of CPT code 90791, including its definition, billing rules, time requirements, differences from similar codes, applicable modifiers, and age restrictions.
By the end of this article, you’ll have a clear, actionable understanding of how to properly document and bill for psychiatric diagnostic evaluations while maximizing reimbursement and minimizing compliance risks.
CPT Code 90791
What Does CPT Code 90791 Mean?
CPT Code 90791 stands for “Psychiatric Diagnostic Evaluation” and is used when a mental health professional conducts an initial assessment of a patient’s psychological and emotional state. This evaluation includes:
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A detailed patient history (medical, psychiatric, family, social)
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Mental status examination (MSE)
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Risk assessment (suicidal/homicidal ideation, self-harm)
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Diagnostic impression (based on DSM-5 or ICD-10 criteria)
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Treatment plan formulation
Unlike therapy codes (e.g., 90837 for psychotherapy), 90791 is strictly for diagnostic purposes and does not include ongoing treatment.
Key Features of CPT 90791
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Used only once per patient (initial visit)
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Can be billed by psychiatrists, psychologists, nurse practitioners, and licensed therapists
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Does not require medical services (unlike 90792)
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Often required before insurance approves further treatment
CPT Code 90791 Description
The American Medical Association (AMA) defines CPT 90791 as:
“A diagnostic evaluation without medical services, consisting of a comprehensive history, mental status examination, and medical decision-making of moderate to high complexity.”
Components of a 90791 Evaluation
| Component | Description |
|---|---|
| Patient History | Includes psychiatric, medical, family, and social history. |
| Mental Status Exam (MSE) | Assesses appearance, mood, cognition, judgment, and insight. |
| Risk Assessment | Evaluates suicide risk, violence potential, and self-harm tendencies. |
| Diagnostic Impression | Uses DSM-5 or ICD-10 to identify mental health conditions. |
| Treatment Plan | Outlines therapy, medication, referrals, or further testing. |
Note: If medical services (e.g., physical exam, lab review) are performed, CPT 90792 should be used instead.
CPT Code 90791 Billing Guidelines
Proper billing ensures reimbursement and reduces audit risks. Key guidelines include:
1. One-Time Use per Episode of Care
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90791 is billed only once per provider for the initial evaluation.
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If a patient switches providers, a new 90791 may be billed.
2. Who Can Bill 90791?
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Psychiatrists (MD/DO)
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Psychologists (PhD/PsyD)
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Licensed Clinical Social Workers (LCSWs)
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Psychiatric Nurse Practitioners (PMHNPs)
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Licensed Professional Counselors (LPCs)
3. Documentation Requirements
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Must include all components (history, MSE, diagnosis, treatment plan).
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Avoid vague notes; insurers may deny claims lacking detail.
4. Insurance Considerations
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Medicare, Medicaid, and private insurers recognize 90791.
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Some insurers require prior authorization.
CPT Code 90791 Time Requirements
Unlike time-based psychotherapy codes (e.g., 90837), 90791 has no strict time minimum. However, a thorough evaluation typically takes:
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45–90 minutes for adults
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60–120 minutes for children (due to collateral interviews with parents/guardians)
Best Practice: Document time spent to justify medical necessity.
CPT Code 90791 vs. 90792
| Feature | CPT 90791 | CPT 90792 |
|---|---|---|
| Medical Services | No | Yes (physical exam, lab review) |
| Performed By | Psychologists, LCSWs, LPCs | Psychiatrists, PMHNPs |
| Typical Use | Initial diagnostic interview | Initial eval with medical components |
Key Takeaway: Use 90792 if medical services are provided; otherwise, 90791 is appropriate.
CPT Code 90791 Modifier
Modifiers adjust claims for specific circumstances. Common modifiers for 90791 include:
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-25 (Significant, separately identifiable service) – Used if another procedure (e.g., medication management) is performed the same day.
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-GT (Telehealth) – For remote evaluations.
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-59 (Distinct procedural service) – Rarely used; indicates separate sessions.
Example:
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90791-GT = Telepsychiatry diagnostic evaluation.
CPT Code 90791 Age Limit
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No strict age limit – Can be used for children, adolescents, and adults.
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Pediatric Considerations:
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Parent/guardian input is often required.
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May require developmental assessments.
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Conclusion
CPT Code 90791 is essential for mental health professionals conducting initial psychiatric evaluations. Proper use ensures accurate billing, compliance, and reimbursement. Remember: 90791 is diagnostic-only, while 90792 includes medical services. Always document thoroughly and apply modifiers correctly.
FAQs
1. Can CPT 90791 be billed more than once?
No, it’s for the initial evaluation only. Subsequent visits use therapy codes (e.g., 90837).
2. Does Medicare cover 90791?
Yes, if performed by an eligible provider.
3. Can LPCs bill 90791?
Yes, if licensed and recognized by the payer.
4. Is 90791 time-based?
No, but insurers expect a thorough evaluation (typically 45+ minutes).
