Accurate coding is the foundation of successful behavioral health billing. Among the most important codes for mental health professionals are CPT Code 90791 and CPT Code 90792, both used for psychiatric diagnostic evaluations. While they seem similar, there are crucial differences that affect who can use them, what services they cover, and how they should be billed.
What Are CPT Codes 90791 and 90792?
Both CPT 90791 and CPT 90792 are used for psychiatric diagnostic evaluations—the comprehensive intake assessment that forms the basis for a mental health treatment plan. These codes replaced the older 90801 and 90802 codes in 2013 to provide clearer distinctions between evaluations with and without medical services.
- CPT 90791: Psychiatric diagnostic evaluation without medical services.
- CPT 90792: Psychiatric diagnostic evaluation with medical services.
What Does a Psychiatric Diagnostic Evaluation Include?
A psychiatric diagnostic evaluation is a thorough assessment that typically involves:
- A full biopsychosocial history (including medical, psychiatric, family, and social background)
- Mental status examination
- Review of symptoms and functional status
- Discussion of diagnosis and treatment recommendations
- Communication with family or other sources, if needed
- Development of an initial treatment plan
CPT 90791: Psychiatric Diagnostic Evaluation (Without Medical Services)
CPT code 90791 is officially defined as a “Psychiatric diagnostic evaluation without medical services”. The AMA describes the service as an “integrated biopsychosocial assessment, including history, mental status, and recommendations”.
The core concept defining this code is the complete absence of medical services like prescribing medication. It is the standard intake code used for assessments that will lead to a course of psychotherapy or counseling.
Who Can Bill CPT 90791?
CPT code 90791 intended for use by a specific group of licensed, non-prescribing mental health professionals. Eligibility is determined by state licensure and scope of practice. The providers who most frequently bill 90791 include:
- Licensed Clinical Social Workers (LCSWs)
- Licensed Professional Counselors (LPCs)
- Licensed Mental Health Counselors (LMHCs)
- Licensed Marriage and Family Therapists (LMFTs)
- Clinical Psychologists
- Psychiatrists (if no medical services are provided)
What Does CPT 90791 Cover?
90791 is used for the initial intake appointment or when a new behavioral health concern arises. It covers an integrated biopsychosocial assessment, history, mental status exam, and recommendations—but does not include any medical services such as prescribing medication, conducting a physical exam, or ordering laboratory tests.
When to Use 90791
- First appointment with a new client
- New episode of care or significant change in diagnosis
- Transfer from another provider where a new intake is needed
Documentation Requirements For CPT Code 90791
- Detailed biopsychosocial assessment
- Mental status exam
- Diagnosis and recommendations
- Communication with family/other sources (if applicable)
- No medical services performed
CPT 90792: Psychiatric Diagnostic Evaluation (With Medical Services)
CPT code 90792 is defined as a “Psychiatric diagnostic evaluation with medical services”. The critical distinction in the AMA’s description is the inclusion of an “integrated biopsychosocial and medical assessment”.This code is designed for initial evaluations where the provider’s medical expertise is applied to the diagnostic process.
Who Can Bill CPT 90792?
- Psychiatrists
- Psychiatric Nurse Practitioners (NPs)
- Physician Assistants (PAs) working in psychiatry
What Does CPT 90792 Cover?
90792 includes everything in 90791, but also covers:
- Medical assessment/physical exam elements as indicated
- Prescription of psychiatric medications
- Ordering and interpreting laboratory or diagnostic studies
- Modifying psychiatric treatment based on medical findings
When to Use 90792
- Initial evaluation by a psychiatrist or psychiatric NP/PA
- When medical services such as medication management, physical exam, or lab orders are provided as part of the assessment
Documentation Requirements For CPT 90792
- All elements required for 90791
- Medical history and physical exam (as indicated)
- Medication review and management
- Orders for labs or other diagnostic studies
- Initial treatment plan, including medical interventions
Key Differences: CPT 90791 vs. CPT 90792
Both CPT codes 90791 and 90792 are used for psychiatric diagnostic evaluations, but they differ significantly in who can bill them and what services are included. Here’s a breakdown to help you choose the correct code:
| Feature | 90791 | 90792 |
| Medical Services Included | No | Yes (medication, physical exam, labs) |
| Who Can Bill | Non-medical mental health professionals | Psychiatrists, psychiatric NPs, PAs |
| Prescribe Medication | No | Yes |
| Order/Interpret Labs | No | Yes |
| Physical Exam | No | Yes (as indicated) |
| Common Use | Intake by therapist/psychologist | Intake by psychiatrist/psychiatric NP/PA |
| Add-on Codes Allowed | 90785 (interactive complexity) | 90785, 90833, 90836, 90863, 99050, 99051 |
Can 90791 and 90792 Be Billed Together?
Generally, 90791 and 90792 should not be billed by the same provider for the same patient on the same day. However, they can be billed on the same day if:
- Different providers (with different credentials) each perform a separate, distinct evaluation (e.g., a psychologist bills 90791 and a psychiatrist bills 90792).
- The payer’s policy allows it (always verify with the insurance company first).
Important: If both codes are billed on the same day, documentation must clearly show two separate, non-overlapping assessments with unique clinical content and signatures.
Common Billing Mistakes and How to Avoid Them
Incorrect use of 90791 and 90792 can lead to denials or audits. Here are common pitfalls and how to stay compliant:
- Using 90791 When Medical Services Are Provided: If any medical service (medication, physical exam, labs) is performed, use 90792—not 90791.
- Non-Medical Providers Billing 90792: Only psychiatrists, psychiatric NPs, or PAs should use 90792. Other mental health professionals should use 90791.
- Billing Both Codes by the Same Provider: Avoid billing both codes for the same patient on the same day by the same clinician.
- Inadequate Documentation: Always document all required elements for each code, including medical decision-making for 90792.
- Billing with E/M Codes: 90791 or 90792 should not be billed on the same day as an E/M service by the same provider for the same patient.
Best Practices for Maximizing Reimbursement
To ensure proper payment and minimize denials when billing 90791 and 90792, follow these proven strategies:
- Verify Payer Policies: Some insurers have unique requirements for who can bill these codes and how often they can be used.
- Document Thoroughly: Include all assessment elements, time spent, and clinical rationale.
- Use Add-On Codes When Appropriate: Don’t miss out on reimbursement for interactive complexity or psychotherapy provided during the intake.
- Stay Updated: CPT codes and payer policies can change—review annually and train your staff.
Conclusion
Understanding the differences between CPT 90791 and CPT 90792 is essential for accurate psychiatric diagnostic evaluation billing. Use 90791 for non-medical mental health professionals and 90792 for psychiatrists or psychiatric NPs/PAs when medical services are included.
Always document thoroughly, follow payer guidelines, and use add-on codes when appropriate to ensure full and correct reimbursement. By mastering these codes, your practice can streamline intake billing, avoid denials, and provide the best possible care for your patients.
