CPT Code 90791: The Definitive Psychiatric Diagnostic Evaluation Guide (2026)
If you're a therapist, psychiatrist, or group practice administrator, you've probably billed CPT code 90791 dozens — maybe hundreds — of times. But are you billing it correctly? Are your notes audit-proof? Are you leaving reimbursement on the table by under-documenting?
This guide cuts through the confusion. We'll cover exactly what 90791 is, who can bill it, what your documentation must include, how much you can expect to get paid, and what common mistakes put your claims at risk.
Let's get into it.
What Is CPT Code 90791?
CPT code 90791 is the billing code for a Psychiatric Diagnostic Evaluation — a comprehensive clinical assessment conducted without medical services (i.e., no prescribing, no medication management). It represents the initial intake evaluation where you're forming a clinical picture, establishing a diagnosis, and laying the groundwork for a treatment plan.
The American Medical Association (AMA) defines 90791 as:
"Psychiatric diagnostic evaluation" — a clinical interview process that includes a history, mental status examination, and may include communication with family or other sources, and review of records.
This is the session where everything starts. It's clinically significant, administratively complex, and — when documented correctly — one of the most reimbursable sessions in your practice.
90791 vs. 90792: Understanding the Critical Difference
This is where many clinicians get tripped up. There are two psychiatric diagnostic evaluation codes, and using the wrong one is a billing error that can trigger a claim denial or a compliance audit.
| Feature | 90791 | 90792 | |---|---|---| | Full Name | Psychiatric Diagnostic Evaluation | Psychiatric Diagnostic Evaluation with Medical Services | | Who Can Bill | Therapists, LPCs, LCSWs, LMFTs, Psychologists, Psychiatrists | Psychiatrists, NPs, PAs (prescribers only) | | Includes Prescribing/Medication Review? | ❌ No | ✅ Yes | | Typical Medicare Rate (2025) | ~$168–$185 | ~$222–$245 | | Requires Medical Decision Making? | No | Yes | | Can Non-Physician Bill It? | Yes | No |
The bottom line: If you are a licensed therapist (LPC, LCSW, LMFT, MFT) or a psychologist, you bill 90791. If you are a psychiatrist, psychiatric NP, or PA and you reviewed medications or made prescribing decisions during the evaluation, you bill 90792.
Billing 90792 when you're a non-prescriber — or when no medical services were rendered — is a compliance violation. Don't do it.
Who Can Bill CPT 90791?
Most major payers recognize 90791 for the following provider types (though always verify with each payer's provider manual):
- Licensed Professional Counselors (LPCs)
- Licensed Clinical Social Workers (LCSWs)
- Licensed Marriage and Family Therapists (LMFTs)
- Psychologists (PhD, PsyD)
- Psychiatrists (MD, DO) — when no medical services are included
- Psychiatric Nurse Practitioners — when no medical services are included
- Supervised clinicians — under specific payer rules (more on this below)
A Note on Supervised Clinicians
If you're a pre-licensed clinician (e.g., an LPCA, LMSW, or associate-level therapist) billing under a supervisor's NPI, the rules vary significantly by payer and state. Medicare, for instance, does not credential associate-level therapists. Medicaid rules differ by state. Commercial payers like Aetna, Cigna, and BCBS each have their own credentialing policies.
Always verify that the rendering provider is credentialed before submitting a 90791 claim under supervision.
Documentation Requirements for 90791
This is where most audits are won or lost. A bare-bones intake note will not hold up under scrutiny from a payer like UnitedHealth Group, Anthem, or Cigna — and it certainly won't survive a Medicare or Medicaid audit.
Here's what your 90791 documentation should include:
1. Chief Complaint / Presenting Problem
Why is the patient seeking treatment now? Document in their own words when possible. "I've been anxious for years, but lately I can't leave the house" is better documentation than "anxiety."
2. Psychiatric History
- Previous diagnoses
- Prior treatment (inpatient, outpatient, therapy, medication)
- Response to prior treatment
- Current providers
3. Medical History
- Relevant medical conditions
- Current medications (even if prescribed by another provider)
- Allergies
- Substance use history (type, frequency, last use, history of treatment)
4. Developmental, Social, and Family History
- Early childhood history
- Family psychiatric history
- Trauma history (document sensitively but specifically)
- Educational and occupational history
- Relationship and social support history
5. Mental Status Examination (MSE)
This is non-negotiable. Your MSE should document:
- Appearance (grooming, eye contact, dress)
- Behavior (psychomotor activity, cooperation)
- Speech (rate, volume, articulation)
- Mood (patient-reported) and Affect (clinician-observed)
- Thought Process (linear, tangential, circumstantial, disorganized)
- Thought Content (SI, HI, delusions, obsessions)
- Perceptions (hallucinations, illusions)
- Cognition (orientation, memory, attention, concentration)
- Insight and Judgment
6. Diagnostic Impression
Document your DSM-5-TR diagnosis with the appropriate ICD-10-CM code. Be specific. "F41.1 - Generalized Anxiety Disorder" is correct. "Anxiety" is not billable.
7. Risk Assessment
Document suicide/homicide risk, any protective factors, and your clinical reasoning. If risk is present, document your safety plan or intervention.
8. Treatment Plan / Clinical Recommendations
What are the next steps? Frequency of sessions? Goals? Referrals? Coordination of care?
9. Collateral Information (If Applicable)
If you communicated with family members, reviewed prior records, or coordinated with another provider, document it. This strengthens your claim that a comprehensive evaluation was conducted.
How Much Does 90791 Reimburse?
Reimbursement rates for 90791 vary by payer, geographic location, and provider type. Here are some general benchmarks based on 2024–2025 fee schedules:
| Payer | Approximate 90791 Rate | |---|---| | Medicare | $168 – $185 | | Medicaid (varies by state) | $85 – $160 | | Aetna | $175 – $220 | | Cigna | $170 – $215 | | UnitedHealthcare | $175 – $225 | | Anthem/BCBS | $165 – $210 | | Out-of-Pocket / Self-Pay | $200 – $400+ |
Important: These are approximate ranges. Your actual contracted rate depends on your specific payer agreement, your geographic region (Medicare uses Geographic Practice Cost Indices), and your provider type. Always verify your fee schedules.
Medicare's 2025 Physician Fee Schedule sets the national facility rate for 90791 at approximately $147 and the non-facility rate at approximately $181. Most behavioral health clinicians practice in non-facility settings (private practice, group practice, outpatient clinic), so the non-facility rate applies.
Common Billing Mistakes That Get 90791 Claims Denied
Here are the errors we see most often — and how to avoid them:
❌ Billing 90791 for Multiple Sessions
90791 is an intake/evaluation code. Most payers limit it to one per provider per patient, per benefit period (often one per year). If you attempt to bill it a second time for the same patient within the same year, expect a denial.
❌ Missing or Incomplete Mental Status Exam
A missing MSE is one of the top reasons 90791 claims are flagged in audits. If your EHR auto-populates a normal MSE without you customizing it, that's a red flag too.
❌ Wrong Diagnosis Code
Vague or symptom-level diagnoses (e.g., Z03.89 — "No diagnosis") paired with 90791 raise payer questions. You should have a primary ICD-10-CM diagnosis code.
❌ Billing Under the Wrong Provider's NPI
If the service was rendered by a supervised clinician, make sure you understand your payer's incident-to billing rules. Billing under a supervisor's NPI when incident-to requirements aren't met is a compliance violation.
❌ No Time or Session Duration Documented
While 90791 is not a time-based code (it doesn't require a minimum number of minutes the way E/M codes do), documenting the session duration supports medical necessity and protects you in an audit.
❌ Billing 90791 and 90792 for the Same Encounter
These codes are mutually exclusive. You cannot bill both on the same date of service for the same patient.
Can You Bill 90791 via Telehealth?
Yes — and this is great news for telehealth practices. Since the COVID-19 Public Health Emergency (PHE) flexibilities were extended and partially made permanent, 90791 is a covered telehealth service under Medicare and most major commercial payers.
For telehealth billing:
- Use the GT modifier (for Medicare and some Medicaid) or 95 modifier (for most commercial payers)
- Ensure you're documenting the technology used (video platform) and that the patient was in an eligible location
- Use POS 10 (Telehealth Provided in Patient's Home) or POS 02 (Telehealth Provided Other Than in Patient's Home) as appropriate under current CMS guidelines
Always verify current telehealth billing rules with each payer — these policies continue to evolve.
90791 and Audit Defense: Protect Your Practice
Medicare and commercial payers conduct routine audits of psychiatric claims, and 90791 is a commonly reviewed code given its relatively high reimbursement. Here's how to protect yourself:
- Use structured templates — not free-form notes — that prompt you to complete every required element of the evaluation.
- Never copy-paste your MSE from session to session or patient to patient. This is a major red flag in audits.
- Date and sign your notes promptly — ideally within 24–48 hours of the encounter.
- Keep records of any collateral contacts (phone calls with family, coordination with PCPs) as part of your documentation.
- Conduct internal audits of your 90791 notes quarterly. Ask: would a reviewer understand the clinical picture without talking to me?
Frequently Asked Questions About CPT Code 90791
1. How long should a 90791 evaluation take?
There's no mandated minimum time for 90791, unlike E/M codes. However, in practice, a thorough psychiatric diagnostic evaluation typically takes 60 to 90 minutes for a new patient. Rushing through an intake in 30 minutes and billing 90791 may raise red flags about medical necessity, especially if your documentation is thin.
2. Can I bill 90791 more than once for the same patient?
Generally, no. Most payers allow one 90791 per patient, per provider, per benefit period (usually per calendar year). However, there may be exceptions — for example, if a patient returns after a significant gap in care (e.g., 2+ years) and requires a full re-evaluation. In these cases, document your clinical rationale clearly and verify with the payer before submitting.
3. Can I bill 90791 and a therapy code (90837, 90834) on the same day?
No. CPT 90791 cannot be billed on the same day as a psychotherapy code (90832, 90834, 90837) with the same provider. The diagnostic evaluation is a standalone service. Some payers may allow 90791 and an E/M code on the same date under specific circumstances, but this is uncommon in purely behavioral health settings.
4. Does 90791 require a treatment plan to be submitted with the claim?
Not as part of the claim itself — treatment plans are not attached to CMS-1500 forms. However, many payers (especially Medicaid managed care plans) require a treatment plan to be completed within a certain number of days after the initial evaluation (commonly 30 days). Failing to complete the treatment plan on time can result in claim recoupment.
5. What modifier should I use for 90791 in a group practice?
In a group practice setting where the supervising provider is different from the rendering provider, use the U1–U9 modifiers (state-specific) or the SA modifier (if a non-physician practitioner is performing the service under physician supervision). The most important thing is that the rendering provider's NPI — not just the billing NPI — is correctly reflected on the claim. Many group practices make the mistake of only submitting the group NPI.
6. Is 90791 covered by Medicare for LCSWs and LPCs?
Medicare covers 90791 for LCSWs who are credentialed as Medicare providers. As of 2024, LPCs and LMFTs became eligible for Medicare enrollment under the Consolidated Appropriations Act (CAA) of 2023, with full enrollment opening in 2024. If you're an LPC or LMFT, now is the time to enroll as a Medicare provider if you haven't already.
The Documentation Problem Most Clinicians Don't Know They Have
Here's the reality: most clinicians are excellent at conducting psychiatric evaluations. The clinical work isn't the problem. The problem is translating that clinical work into documentation that's:
- Complete enough to survive an audit
- Specific enough to support the diagnosis
- Structured enough to process quickly at scale
- Consistent enough across a group practice
This is especially challenging when you're seeing 6–8 new patients a week, each requiring a 90791 documentation package that's clinically sound, payer-compliant, and signed within 48 hours.
That's exactly the problem Mozu Health was built to solve.
How Mozu Health Helps You Bill 90791 With Confidence
Mozu Health is an AI-powered clinical documentation platform built specifically for behavioral health — therapists, psychiatrists, psychologists, and group practices.
Here's what Mozu Health does for your 90791 documentation workflow:
- Structured intake templates that prompt you to capture every required element — chief complaint, psychiatric history, MSE, risk assessment, diagnosis, and treatment plan
- AI-assisted note drafting that turns your session data into HIPAA-compliant, audit-ready documentation in minutes — not hours
- ICD-10-CM code suggestions that match your clinical narrative, reducing coding errors
- Billing accuracy checks that flag common errors before claims are submitted (like missing MSE fields or mismatched provider NPIs)
- Audit defense support with complete documentation trails, timestamps, and version history
- Group practice tools that maintain consistency across multiple clinicians and locations
Whether you're a solo therapist trying to close notes faster or a group practice administrator managing compliance across 20 clinicians, Mozu Health gives you the infrastructure to get 90791 — and every other code you bill — right the first time.
Ready to Simplify Your 90791 Documentation?
Stop second-guessing your intake notes. Stop losing time to documentation that should take 15 minutes but takes 45. Stop worrying about whether your 90791 claims will hold up under payer scrutiny.
Try Mozu Health today and see how AI-powered documentation can transform your behavioral health practice — from intake through audit defense.
👉 Start your free trial at mozuhealth.com
Your clinical work is excellent. Your documentation should be too.
