If you've seen CPT code 90791 on a therapy bill or explanation of benefits, you may have wondered what it actually covers. This code represents a specific and important service: your very first mental health evaluation. It is not a therapy session - it is the structured assessment that happens before ongoing treatment begins, and it lays the clinical groundwork for all the care that follows.

CPT code 90791 covers a psychiatric diagnostic evaluation without medical services. In plain terms, it is the comprehensive intake appointment where a licensed mental health professional gathers your full history, assesses your current mental health, and begins mapping out what care might look like for you.

Key Takeaways

• CPT 90791 is used for initial psychiatric diagnostic evaluations performed by licensed mental health professionals such as therapists, psychologists, and licensed clinical social workers. It does not include any medical services such as prescribing medication - that falls under a separate code.

• Sessions typically run between 45 and 60 minutes. The Centers for Medicare & Medicaid Services (CMS) sets a minimum of 16 minutes and a maximum of 90 minutes under this single code.

• Most insurance plans cover this service, but benefits vary. Verifying your specific coverage before your first appointment is the best way to avoid unexpected costs.

What Is CPT Code 90791?

CPT code 90791 is a billing code maintained by the American Medical Association (AMA) under the Psychiatric Diagnostic Evaluation Services category. It describes an integrated biopsychosocial assessment that includes a review of the patient's history, a mental status examination, and clinical recommendations. The evaluation may also include communication with family members or other sources, as well as a review of prior diagnostic records.

This code covers assessment only - it does not include any medical services. That means no prescriptions, no lab orders, and no physical examination elements. Providers who perform evaluations that do include medical services use a different code, which is reserved for psychiatrists and other licensed medical professionals.

Who Uses This Code?

A range of licensed mental health professionals can bill 90791, including:

• Licensed clinical social workers (LCSWs)

• Licensed professional counselors (LPCs)

• Licensed marriage and family therapists (LMFTs)

• Licensed mental health counselors (LMHCs)

• Psychologists (PhD, PsyD)

• Psychiatrists (when conducting an evaluation without medical services)

What Does a Session Billed as CPT 90791 Cover?

This first appointment is more thorough than a regular therapy session. Your provider is building a clinical picture from the ground up. Based on CMS documentation guidance, a complete 90791 evaluation includes:

• A full medical and psychiatric history

• A mental status examination

• An assessment of current concerns and how they affect daily functioning

• A review of any prior diagnoses or treatment records

• Communication with family members or other support systems, when relevant

• A preliminary diagnosis based on established diagnostic criteria

• An initial treatment plan with clinical recommendations

Sessions typically run 45 to 60 minutes, though CMS specifies a minimum of 16 minutes and sets 90 minutes as the upper limit under this code alone.

Telehealth Coverage

CPT 90791 can be billed for telehealth sessions. Providers billing telehealth evaluations typically add modifier 95 to the claim to indicate the service was delivered remotely. Coverage for telehealth under this code varies by insurer and state, so confirming your plan's telehealth policy before your appointment is always a good step.

Does Insurance Cover CPT Code 90791?

Most major insurance plans cover CPT 90791, though the details vary by plan. Here is what to know.

Commercial Insurance Private insurers are generally required under the Mental Health Parity and Addiction Equity Act to cover mental health evaluations on a comparable basis to medical ones. Copays, deductibles, and prior authorization requirements differ by plan.

Medicare Medicare Part B covers CPT 90791 for eligible beneficiaries. According to CMS fee schedule data, the 2026 Medicare reimbursement rate for this service is approximately $173.35 at the national level for non-facility settings. Rates are adjusted by geographic location, so your local rate may differ. The best way to find the exact rate for your area is to use the CMS Physician Fee Schedule lookup tool directly.

Medicaid Medicaid covers CPT 90791 in most states, though rates vary significantly from state to state. A 2022 analysis published in Health Affairs found the mean Medicaid reimbursement for CPT 90791 across states was approximately $134.73, though this figure is based on 2022 fee schedules and will not reflect current rates in your state.

Prior Authorization Some insurers require prior authorization before a 90791 evaluation can be billed. Calling the member services number on your insurance card before scheduling - and asking specifically about this code - is the most reliable way to confirm.

Action step: When you call your insurer to verify benefits, give them CPT code 90791 and ask: Is this covered under my plan? Do I need a referral or prior authorization? What is my cost-sharing responsibility for this visit?

How Much Does a Session Billed Under CPT 90791 Cost?

Without insurance, the out-of-pocket cost for a 90791 evaluation typically ranges from around $150 to $300 or more, depending on the provider's location, credential level, and practice setting. Urban areas and doctoral-level providers tend to be on the higher end.

With insurance, your out-of-pocket responsibility depends on your deductible, copay, and whether your deductible has already been met for the year. Many people with active coverage pay a standard mental health copay for this visit.

For those without insurance or with high out-of-pocket costs, options include:

• Sliding scale fees: Many therapists in private practice offer income-adjusted rates. It is always appropriate to ask.

• Community mental health centers: Federally qualified health centers often provide evaluations at reduced or no cost. The Health Resources & Services Administration has a tool to find one near you.

• Open Path Collective: A nonprofit network connecting clients with reduced-fee mental health providers.

CPT Code 90791 vs. CPT Code 90792: What Is the Difference?

These two codes describe very similar services but serve different clinical contexts.

The key distinction is straightforward: 90791 covers a psychiatric diagnostic evaluation without any medical services. 90792 covers the same type of evaluation but includes medical services - such as prescribing medication or ordering diagnostic tests - and can only be used by providers who are licensed to perform those services, typically psychiatrists and psychiatric nurse practitioners.

If your provider is a therapist, counselor, or psychologist who does not prescribe medication, you will see 90791 on your bill. If your evaluation was conducted by a psychiatrist who also discussed or initiated medication during that same visit, you may see 90792.

How Many Times Can This Code Be Billed?

CPT 90791 is typically billed once per patient per provider. It is designed for the initial intake evaluation, not for ongoing sessions. According to CMS billing guidance, a provider may repeat the evaluation for the same patient if there has been an extended break in treatment - which CMS defines as approximately six months since the patient was last seen or treated - if the patient requires inpatient psychiatric admission, or if there is a significant change in mental status requiring further assessment. Using it for routine follow-up sessions would not be appropriate under standard billing guidelines.

Some insurance plans allow it to be billed once per year per provider, while others permit it once every six months. Checking with your specific payer is the most reliable way to confirm frequency limits.

Add-On Code for Interactive Complexity

If a 90791 evaluation involves interactive complexity - for example, when communication is complicated by the presence of family members with conflicting concerns, a minor whose legal guardian is involved, or a patient who requires an interpreter - providers may add code 90785 alongside 90791 to reflect that additional work. The APA and CMS both confirm that 90785 can be reported as an add-on to 90791 when at least one of the qualifying complicating factors is documented in the session notes.

What to Expect During a 90791 Evaluation

Walking into your first mental health appointment can feel uncertain, especially if you are not sure what will happen. Here is what a 90791 evaluation typically looks like in practice.

Your provider will spend most of the session asking questions - about what brought you in, your personal and family history, your mental and physical health background, and how your current challenges are affecting your day-to-day life. This is not therapy yet. The goal is for your provider to understand your full picture before recommending a path forward.

By the end of the appointment, your provider will have an initial clinical impression and a preliminary idea of what treatment might involve. They may share some early recommendations with you, or they may need to follow up in a second visit before finalizing a treatment plan, depending on the complexity of your situation.

Streamlining Your 90791 Documentation with Berries AI

A thorough 90791 evaluation produces a significant documentation load. Your notes need to capture a complete biopsychosocial history, mental status findings, diagnostic impressions, and an initial treatment plan - often within a tight window after an already-intensive session.

Berries AI is a clinical documentation tool built specifically for mental health providers. It works as an AI scribe during sessions, helping turn intake conversations into structured, HIPAA-compliant clinical notes automatically. Instead of spending an hour after an intensive evaluation writing it up, you walk away with a complete draft ready to review. That means more time with clients and less time on paperwork.

Frequently Asked Questions

Is CPT code 90791 covered by Medicaid? Yes, in most states. However, reimbursement rates vary considerably by state and managed care plan. Contact your state Medicaid program or your plan directly to confirm coverage and any specific documentation requirements before billing.

Can a psychiatric nurse practitioner bill CPT 90791? A psychiatric nurse practitioner (PMHNP) is generally expected to use the code that reflects whether medical services were included in the evaluation. If medication was discussed or prescribed during the visit, a different code would typically apply. Billing rules vary by payer and state, so confirming with your specific insurer is recommended.

What is the difference between CPT 90791 and a regular therapy session? A 90791 evaluation is a diagnostic and assessment process - it is not treatment. It is the structured intake that happens before therapy begins. Ongoing therapy sessions are billed under separate CPT codes based on session length. Think of 90791 as the clinical foundation that makes everything after it possible.

Can CPT 90791 be billed via telehealth? Yes. CPT 90791 is eligible for telehealth billing. Providers typically add modifier 95 to indicate the service was delivered remotely. Always verify your specific plan's telehealth coverage before scheduling a remote evaluation.

Why does 90791 sometimes appear on my bill even though I've seen this therapist before? If you had a significant gap in treatment or are presenting with a substantially new clinical concern, your provider may conduct a full re-evaluation and bill 90791 again. This is clinically appropriate when the circumstances genuinely require a fresh comprehensive assessment. If you are unsure why it appeared on a specific bill, contacting your provider's billing department directly is the clearest path to an explanation.

The Bottom Line

If you see CPT code 90791 on your bill or explanation of benefits, it reflects the comprehensive intake evaluation at the start of your mental health care. It is the code that covers the time your provider spent building a full clinical picture - your history, your current challenges, and what treatment might look like going forward. Most insurance plans cover it, but verifying your specific benefits before your first appointment will help you understand your costs and avoid surprises.

Ready to spend less time on documentation and more time with your clients? Berries AI helps mental health providers turn intake sessions into complete, structured clinical notes - automatically.

This article is for informational purposes only and does not constitute medical or legal advice. Coverage varies by plan. Contact your insurance provider to verify benefits. CPT code descriptions have been paraphrased and are not reproduced verbatim from AMA materials.

Sources

1. American Medical Association. CPT® Code Information. https://www.ama-assn.org/practice-management/cpt

2. AAPC Codify. CPT® Code 90791 - Psychiatric Diagnostic Evaluation Services. https://www.aapc.com/codes/cpt-codes/90791

3. Centers for Medicare & Medicaid Services. Billing and Coding: Psychiatric Diagnostic Evaluation and Psychotherapy Services (Article A57520). https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleId=57520

4. Centers for Medicare & Medicaid Services. Billing and Coding: Psychiatry and Psychology Services (Article A57480). https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleId=57480 

5. Centers for Medicare & Medicaid Services. Physician Fee Schedule Search Tool. https://www.cms.gov/medicare/physician-fee-schedule/search

6. Centers for Medicare & Medicaid Services. Physician Fee Schedule Overview. https://www.cms.gov/medicare/payment/fee-schedules/physician

7. TheraThink. CPT Code 90791: The Definitive Guide [+2026 Reimbursement Rate]. https://therathink.com/cpt-code-90791/

8. American Psychiatric Association Services. Psychotherapy Codes for Psychologists. https://www.apaservices.org/practice/reimbursement/health-codes/psychotherapy 

9. American Psychiatric Association. CPT Primer for Psychiatrists. https://www.psychiatry.org/File%20Library/Psychiatrists/Practice/Practice-Management/Coding-Reimbursement-Medicare-Medicaid/Coding-Reimbursement/cpt-primer-for-psychiatrists.pdf

10. Headway. How to Use CPT Code 90791. https://headway.co/resources/cpt-code-90791