90791 vs 90792: the real difference, with a complete psychiatric evaluation note example

By Selam Koch, PMHNP-BC, founder of OneStep Scribe and practicing psychiatric nurse practitioner. Published July 2026.

Both codes are psychiatric diagnostic evaluations: the intake visit where you take the full history, establish a diagnosis, and set a treatment plan. The difference is one clause in the CPT descriptor. 90792 is a psychiatric diagnostic evaluation with medical services. 90791 is the same evaluation without them. 90791 is the lane for psychologists, therapists, and other non-prescribing clinicians, and for prescribers when no medical service was actually performed. 90792 is the lane for psychiatrists, psychiatric NPs, and other prescribers who deliver medical services during the intake.

The real difference: medical services

"Medical services" is not defined by how long the visit ran or how sick the patient is. It means the evaluation included work that requires medical training: prescribing or actively managing medication, medically focused history and exam elements, or ordering and interpreting labs. Starting an SSRI counts. Reviewing a patient's lisinopril for interactions counts. So does ordering a TSH to rule out thyroid disease, and so does a documented decision to defer medication.

Scope of practice decides who can bill 90792 at all: in most states medical services sit outside a psychologist's or therapist's scope, so the code is effectively limited to physicians, NPs, and PAs. Payer credentialing adds another layer, and some plans restrict 90792 to specific provider types, so verify with the plans you bill.

90791 vs 90792 at a glance

	90791	90792
What it is	Psychiatric diagnostic evaluation	Psychiatric diagnostic evaluation with medical services
Who typically bills it	Psychologists, therapists, counselors; prescribers when no medical service was performed	Psychiatrists, PMHNPs, and other prescribers
Medical services included	No	Yes: medication work, medical history and exam elements, labs
Typical use	Therapy intake, psychological evaluation	Psychiatric intake where medication is started, managed, or deliberately deferred

The billing rules both audiences need

No CPT-defined time threshold. Unlike the psychotherapy codes, neither 90791 nor 90792 has a required minute count. Document session length anyway: some payers impose minimums or expect start and stop times.
No psychotherapy the same day, same clinician. Psychotherapy codes are not separately reportable by the clinician who bills 90791 or 90792 that day. For therapy alongside medication management at later visits, see the annotated 90833 note example.
No same-day E/M by the same clinician. CPT bars reporting either evaluation code on the same day as an E/M service performed by the same clinician. With 90792, the medical work is already inside the code.
Frequency limits are payer-specific. Many payers cover one diagnostic evaluation per clinician per episode of care. Some allow a re-evaluation after a long treatment gap or a major clinical change, but that is payer policy, not a CPT rule.
Prescribers sometimes have an E/M alternative. A new-patient E/M can be an option instead of 90792; the better choice depends on the payer and what the visit contained. For how E/M selection works in psychiatry, see the 99214 with 90833 billing guide.
Interactive complexity exists. Add-on 90785 can be reported with either code when the visit involves qualifying complicating factors: maladaptive communication among participants, caregiver emotions or behaviors that interfere with the plan, a mandated-report discussion after a sentinel event, or language and developmental barriers such as an interpreter in the room.

The example note: a complete 90792 evaluation

The patient below is fictional. The ALL-CAPS headings are the exact structure OneStep Scribe generates for psychiatric evaluations, trimmed here for length.

Psychiatric diagnostic evaluation (90792)

CHIEF COMPLAINT

"I can't shut my brain off at night. I'm worried about everything, all the time, and it's wearing me out."

Daniel Reyes, a 41-year-old man, presents for initial psychiatric evaluation reporting persistent anxiety and insomnia. He is self-referred after months of worsening sleep and worry. Total evaluation time: 55 minutes.

HISTORY OF PRESENT ILLNESS

Daniel describes excessive worry present most days for approximately 14 months, worsening over the past three. The worry ranges across work deadlines, his children's health, finances, and "things that haven't even happened yet." A promotion to a supervisory role 18 months ago raised his baseline load. He rates the anxiety "a 7 most days" and describes feeling keyed up in the evenings, fatigue on waking, difficulty concentrating in long meetings, and irritability at home that he calls "not who I want to be." Sleep onset takes one to two hours, and he wakes around 3 a.m. with racing thoughts. The worry is no better in daytime: he has tried to set it aside and redirect himself at work without success, and says once it starts he cannot stop it. Cutting caffeine from five cups to two did not help. He denies discrete panic attacks, persistent depressed mood, and loss of interest.

PAST PSYCHIATRIC AND FAMILY HISTORY

Prior diagnoses: None. Prior treatment or medications: None. Prior hospitalizations: Denies. Suicidal ideation history: Denies. Suicide attempts: Denies. Self-harm history: Denies. Danger to others: Denies. Family history: mother treated for anxiety with an SSRI, reportedly with good response. No family history of suicide.

MEDICAL AND SUBSTANCE HISTORY

Current conditions: Hypertension, well controlled. Current medications: Lisinopril 10 mg daily, prescribed by his primary care provider. Allergies: NKDA.

SUBSTANCE USE

Alcohol: One to two drinks on weekends, no tolerance or withdrawal. Cannabis: Denies. Nicotine: Denies. Caffeine: Two cups of coffee daily, reduced from five.

SOCIAL HISTORY

Married 12 years with a supportive spouse, two children ages 8 and 10. Works as a construction project manager. Exercise has lapsed since the promotion.

MENTAL STATUS EXAMINATION

Alert, cooperative, casually dressed and well groomed. Mood "worn down," affect anxious but full range and congruent. Speech normal in rate and tone; thought process linear and goal-directed with no evidence of psychosis. Insight and judgment intact. Denies suicidal ideation, homicidal ideation, and self-harm.

RISK ASSESSMENT

Current ideation: Denies SI, HI, and self-harm. Modifiable risk factors: Chronic sleep deprivation, untreated anxiety. Non-modifiable risk factors: Male sex, middle age. Protective factors: Strong treatment motivation, supportive spouse, two children in the home. Overall risk level: Low. No current ideation, no attempt history, multiple engaged protective factors.

ASSESSMENT

F41.1 Generalized Anxiety Disorder, moderate. Daniel meets DSM-5-TR criteria: excessive anxiety and worry more days than not for over six months across multiple domains (criterion A), which he finds difficult to control (criterion B), with restlessness, fatigue, impaired concentration, irritability, and sleep disturbance (criterion C), causing clinically significant occupational and family impairment (criterion D). Major depressive disorder and panic disorder were considered and ruled out; he denies persistent low mood, anhedonia, and discrete panic attacks. A medical or substance contributor is unlikely but not yet excluded; caffeine reduction did not resolve symptoms, and thyroid studies are ordered today. Adjustment disorder was considered given the promotion, but the duration and pervasiveness of the worry exceed it. Daniel presents with moderate, long-standing generalized anxiety now impairing sleep, work, and family life, with good insight and strong motivation for treatment.

PLAN

1. Start escitalopram 10 mg by mouth daily. Reviewed expected timeline and common early side effects; will reassess dose at follow-up. No interaction with lisinopril.

2. Ordered TSH, CBC, and CMP to rule out medical contributors before attributing all symptoms to GAD.

3. Deferred a dedicated sleep medication. Rationale discussed: the insomnia is driven by nighttime worry, and treating the anxiety should improve sleep. Reassess in four weeks before adding a second agent.

4. Referral for cognitive behavioral therapy targeting worry and sleep.

5. Follow up in four weeks, sooner if symptoms worsen. Patient verbalized understanding and agreement.

What makes this 90792 instead of 90791: the medical services are documented, not implied. The clinician started a prescription with a risk and side-effect discussion, checked a drug interaction, and documented the decision to defer a second medication. Each of those can carry the requirement on its own. The medication and medical history review and the lab orders reinforce it as part of the medical decision making, but standing alone they are a downcode risk, since a complete 90791 documents a medication list too. Strip the medical layer out and the identical visit is a 90791.

What a reviewer checks in any diagnostic evaluation, either code: three things. The diagnosis is supported by documented DSM-5-TR criteria, not just named. A risk assessment is present with an explicit SI and HI statement. And the treatment plan follows from the formulation, so the chief complaint, symptoms, diagnosis, and plan read as one continuous thread.

How the same visit documents as 90791

If a psychologist or therapist evaluated Daniel, the skeleton above works unchanged: chief complaint, HPI, histories, mental status exam, risk assessment, and the criteria-mapped assessment stay exactly as written. What comes out is the medical layer: no prescription and consent discussion, no lab orders, no interaction check, no deferral rationale. The plan becomes a therapy plan: a CBT course with frequency and goals, plus a referral back to a prescriber or his PCP for the medical questions. Same diagnosis, same rigor, different code.

Five denial and audit pitfalls

90792 with no documented medical service. If the note shows no medication work, no medical history or exam elements, and no labs, expect a downcode to 90791 or a denial.
Psychotherapy billed the same day by the same clinician. The evaluation codes bundle it. Expect this pairing to be denied under standard CPT edits.
Diagnosis not supported by documented criteria. "GAD" on the claim with an HPI that never establishes duration, control, or the criterion C symptoms is a records-request magnet.
Missing risk assessment. An intake without an explicit SI and HI statement fails most review standards regardless of code.
Frequency limit exceeded without justification. A second evaluation inside the same episode needs a documented reason, such as a long gap in care or a major clinical change, and even then payer policy controls.

The most common 90792 failure is silence. The prescriber did medical work but the note never says so: no medication statement, no lab decision, no medical reasoning. If you started nothing, write down what you considered and why you deferred. An undocumented deferral reads as a 90791.

Frequently asked questions

Can a psychologist bill 90792?

Generally no. The medical services in the descriptor sit outside most psychology scopes of practice. A few states grant prescriptive authority to specially trained psychologists, and payer credentialing adds its own layer, so the honest answer is state- and plan-dependent. For most psychologists, 90791 is the code.

Can I bill 90791 and 90792 for the same patient?

Not on the same day by the same clinician. Across an episode of care, payer rules control: a therapist billing 90791 and a prescriber billing 90792 for the same patient is common and usually fine, but confirm how each plan counts evaluations.

Is there a required minimum time?

CPT sets no time threshold for either code. Some payers publish expectations or minimums anyway, so document the session duration every time.

Can I bill psychotherapy the same day?

Not if you billed the evaluation. A different clinician seeing the patient the same day may be able to, subject to payer edits.

Does telehealth work for 90791 and 90792?

Both codes are widely covered via telehealth. Modifier and place-of-service requirements differ by payer, so check before the first virtual intake, not after.

The evaluation above is the structure OneStep Scribe drafts automatically.

OneStep Scribe is an AI scribe for mental health: psychiatrists, PMHNPs, therapists, psychologists, and other mental health providers. It listens to the intake and drafts the complete evaluation in this exact structure, plus progress and SOAP notes for follow-ups, for your review and signature. Every account is NPI-verified.

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This article is educational and reflects one clinician's documentation approach. It is not legal, billing, or payer-specific advice, and it does not guarantee reimbursement. CPT is a registered trademark of the American Medical Association. The patient described is fictional. Always verify requirements with your payers and compliance advisors.