90791 vs 90792: Psychiatric Diagnostic Evaluation Billing

90791 vs 90792 at a glance

The 90791 vs 90792 choice depends on one question: did the evaluation include medical services? Both codes report a psychiatric diagnostic evaluation, the structured intake that establishes a diagnosis and treatment plan. 90792 adds medical services, such as a medical assessment or medication review, that only clinicians with prescribing or medical scope can perform.

Aspect	90791	90792
Descriptor	Psychiatric diagnostic evaluation	Psychiatric diagnostic evaluation with medical services
Typical clinicians	Psychologists, clinical social workers, counselors, MFTs, and prescribers when no medical services are given	Psychiatrists and other physicians, psychiatric nurse practitioners and physician assistants within their scope
Medical services included	No	Yes, for example medical history review, physical assessment elements or medication evaluation
Time-based	No time in the descriptor	No time in the descriptor
Interactive complexity (90785)	May be added when a qualifying factor applies	May be added when a qualifying factor applies

Both codes sit in the psychiatry section of CPT. For the wider code set, including psychotherapy time ranges, see our behavioral health billing guide.

The 90791 CPT code: what the evaluation includes

The 90791 CPT code describes an integrated biopsychosocial assessment. It is the usual first billable visit for therapists, psychologists and counselors, and it can be performed with the patient alone or with family members or other informants when that helps the assessment.

• History of the presenting problem, psychiatric history and relevant medical history.
• Mental status examination.
• Psychosocial history: family, education, work, relationships, substance use and trauma.
• Risk assessment, such as suicide and violence risk.
• Diagnosis using ICD-10-CM codes, and a treatment plan with recommendations.
• Ordering or reviewing tests when relevant, and communication with other providers or family as needed.

Because there is no time in the descriptor, 90791 is not chosen by minutes. The note should still record the length of the visit, since some payers review unusually short or long evaluations.

The 90792 CPT code: when medical services are added

The 90792 CPT code includes everything in 90791 plus medical services. That may include review of medical conditions that affect the psychiatric picture, a focused physical or neurological assessment, review of current medications and side effects, and prescribing decisions.

A clinician who cannot provide medical services within their license should not bill 90792. For a psychiatrist or psychiatric nurse practitioner, the question is whether the medical component was actually performed and documented. An intake that is purely a psychosocial interview by a prescriber is still 90791.

Many payers also allow a prescriber to report a new-patient E/M code instead of 90792 for an initial psychiatric visit with medical management. Which one fits depends on the payer's policy and what the documentation supports; some practices compare payer fee schedules and coverage rules for both before setting a default. Our psychiatric billing page explains how prescriber workflows differ from therapist workflows.

Can you bill 90791 and 90837 on the same day?

A common question from new practices is: can you bill 90791 and 90837 on the same day? Under Medicare's National Correct Coding Initiative policy, the answer is no. The NCCI policy manual states that 90791 and 90792 are not separately reportable with individual, group, family, crisis or other psychotherapy codes for the same date of service. Many commercial payers apply the same edits.

• Same day, same patient: bill the diagnostic evaluation only. The therapeutic work done during the intake is part of 90791 or 90792.
• Psychotherapy starts at the next visit: bill 90832, 90834 or 90837 from the second session onward, based on time.
• Crisis on intake day: if the visit becomes a crisis session, bill the code that matches what was provided and documented, not both.
• Different providers: payer rules for two clinicians in the same group seeing the patient on one day vary. Check the payer's edits and modifier policy before billing.

Same-day rules with E/M and other codes

A prescriber who completes 90792 has already performed the medical evaluation, so an E/M code for the same visit generally duplicates that work. CPT guidance says 90791 and 90792 are not reported on the same day as an E/M service by the same individual for the same patient, and payer edits commonly deny the pair, so do not expect it to be paid.

Code billed with 90791 or 90792 on the same day	Typical outcome
Psychotherapy (90832, 90834, 90837)	Not separately reportable under NCCI
Psychotherapy add-ons (90833, 90836, 90838)	Not separately reportable under NCCI
Crisis psychotherapy (90839, 90840)	Not separately reportable under NCCI
Interactive complexity (90785)	Allowed when a qualifying factor is documented
E/M by the same clinician	Not reported together under CPT guidance; commonly denied

How often 90791 and 90792 can be billed

CPT does not set a fixed frequency for diagnostic evaluations, but payers do. Medicare contractor guidelines describe the evaluation as typically performed once, at the onset of an illness or episode, with repeat evaluations allowed in specific circumstances such as a significant change in the patient's condition or a new episode of care.

• Many commercial plans limit diagnostic evaluations to one per patient, per provider, per year or per episode.
• Some payers allow an evaluation to be split across more than one session when the assessment cannot be completed in one visit, often with documentation or authorization requirements.
• A second evaluation by a different provider, such as a psychiatrist after a therapist's intake, may be covered when the note shows the medical reason.
• Check the payer policy before scheduling a repeat evaluation, and document why it is needed.

Common denials on diagnostic evaluations

Most denials on these codes trace back to a handful of causes. Reviewing remittance codes by evaluation code helps you spot which one is driving the problem.

• Same-day psychotherapy: a session code billed with the intake triggers a bundling edit. Remove the psychotherapy line or move it to the correct date.
• Frequency limit reached: the payer already paid an evaluation for this patient within its limit. Check claim history before scheduling a repeat.
• Provider type mismatch: 90792 billed under a non-prescribing clinician, or a license type the plan does not credential for evaluations.
• Missing authorization: some behavioral health plans require approval for the first visit or for evaluations beyond the first.
• Carve-out payer: the claim went to the medical plan when a separate behavioral health organization manages the benefit.

Documentation and claim tips

Diagnostic evaluation denials usually come from missing elements or from coding the wrong evaluation type. A clear structure in the template prevents most of them.

1. Use a template that records each element of the evaluation, including mental status and risk assessment.
2. For 90792, include a separate heading for the medical component and the medical decisions made.
3. Record the diagnosis to the highest specificity the evaluation supports.
4. Note the reason for 90785 when interactive complexity applies, such as an interpreter or caregiver interference.
5. For telehealth, record the patient's location and use the payer's POS and modifier rules.
6. Verify benefits and any authorization requirement before the intake, since some plans require it for the first visit.

Fastora's medical coding reviews include checks on evaluation code choice and same-day pairs. If you want to see how your intake claims hold up, a free billing assessment can review a sample.

Frequently asked questions