CPT Code 90791: Psychiatric diagnostic evaluation billing guide

Key Takeaways

CPT Code 90791 is the psychiatric diagnostic evaluation code without a medical services component, used for initial mental health assessments.

Eligible providers include psychiatrists, psychologists, LCSWs, LPCs, licensed marriage and family therapists, NPs, and PAs enrolled in Medicare.

Missing a mental status exam, treatment plan, or DSM-5/ICD-10 diagnosis in the clinical note is the most common reason claims for 90791 are denied.

Pabau, practice management software for mental health practices, offers digital intake forms and claims management tools that capture required 90791 documentation and support clean claim submission.

CPT Code 90791 is the AMA’s designated code for a psychiatric diagnostic evaluation performed without a medical services component. It covers the initial comprehensive mental health assessment: gathering psychiatric history, conducting a mental status examination (MSE), establishing a diagnosis, and formulating a treatment plan.

This guide covers eligible providers, documentation requirements, reimbursement rates, telehealth rules, and the most common claim denial patterns for CPT 90791 in 2026.

CPT Code 90791: Definition and clinical description

The official AMA descriptor reads: Psychiatric diagnostic evaluation. “Without medical services” means no prescribing, no medication management, and no E/M service is bundled into the encounter.

The moment a provider performs a medical evaluation alongside the psychiatric assessment, such as reviewing labs or ordering medications, CPT 90791 is no longer the right code. CPT 90792 takes over instead.

CPT 90791 quick reference

Use this table for a fast check before billing. Verify the current-year rate using the CMS fee schedule lookup, since Medicare locality adjustments apply.

The non-facility rate reflects services performed in an office or outpatient setting where the practice bears overhead costs. Always confirm the rate for your specific Medicare Administrative Contractor (MAC) locality before submitting claims. Mental health practices using EHR for private practice workflows can automate this cross-check at the point of claim submission.

Who can bill CPT Code 90791?

Provider eligibility is where many practices hit unexpected denials. CPT Code 90791 is not restricted to psychiatrists. Under Medicare, any qualified mental health professional enrolled in the program may bill 90791, subject to state licensure and payer enrollment requirements. Scope-of-practice rules vary by state, so verify before billing for any provider type not listed below as having explicit Medicare recognition.

• Psychiatrists (MD, DO): Fully eligible; may also use 90792 when medical services are performed.
• Psychologists (PhD, PsyD): Eligible; independently licensed in most states; cannot bill 90792 (no prescribing authority).
• Licensed Clinical Social Workers (LCSWs): Eligible under Medicare Part B when independently licensed; 75% of physician fee schedule rate applies.
• Licensed Professional Counselors (LPCs) and Licensed Mental Health Counselors (LMHCs): Eligible for Medicare as of January 1, 2024 under the Consolidated Appropriations Act provisions; 75% rate applies.
• Licensed Marriage and Family Therapists (LMFTs): Also eligible as of January 1, 2024 under the same provisions.
• Nurse Practitioners (NPs) and Physician Assistants (PAs): Eligible; must bill under their own NPI and within their scope of practice, which varies by state. Depending on state regulation, NPs and PAs may also bill 90792.
• Addiction counselors and peer support specialists: Generally not eligible for Medicare 90791 billing independently; must bill incident-to or through a supervising physician.

Practices using psychiatry EMR software can configure provider-level billing permissions to prevent ineligible providers from submitting 90791 claims accidentally. Supervision requirements for non-physician practitioners should be confirmed with your MAC and state licensing board before billing.

Documentation requirements for CPT 90791

A clean 90791 claim starts with a complete clinical note. Payers audit psychiatric diagnostic evaluation claims closely because the service is not time-based, which means documentation must substantiate the medical necessity of a full diagnostic workup, not just a brief intake. Use this checklist before submitting any 90791 claim.

Structuring intake notes to capture every element above is easier with a purpose-built psychiatric evaluation template that prompts clinicians through each section. Practices that use digital intake forms can pre-populate demographic and history fields from the patient intake, reducing the clinical documentation burden at the time of the evaluation itself.

CPT 90791 reimbursement rates (2026)

Medicare reimbursement for CPT Code 90791 is set annually through the Medicare Physician Fee Schedule (MPFS). Rates are locality-adjusted, meaning a practice in Manhattan will receive a different payment than one in rural Mississippi. The figures below reflect national averages for 2026. Always verify the exact amount for your MAC locality using the FastRVU RVU lookup tool.

The 2026 non-facility rate is subject to the Centers for Medicare and Medicaid Services (CMS) final rule. Rates marked “approximate” above require verification against the published MPFS because locality adjustments can shift the effective rate by 15% or more depending on geographic area. Medicaid rates are entirely state-specific and must be confirmed with your state Medicaid agency.

CPT 90791 vs 90792: Key differences

The distinction between CPT Code 90791 and CPT 90792 is one of the highest-risk coding decisions in outpatient mental health billing. Using 90792 when no medical services were rendered is considered upcoding and can trigger payer audits. This comparison table clarifies when each code applies.

Psychologists and licensed counselors should never bill CPT 90792, regardless of how comprehensive the evaluation was. Their scope of practice does not include medical services, making 90791 the correct code every time. Psychiatrists and prescribing NPs should use 90792 only when they genuinely performed a medical evaluation, such as ordering labs, reviewing current medications, or initiating a prescription.

CPT 90791 vs 90837: When to use each

Confusing CPT Code 90791 with CPT 90837 is a common billing error, especially among newer practice managers. The two codes describe completely different clinical activities. 90791 is a one-time diagnostic activity. 90837 is ongoing treatment. Billing 90837 at the first session is a compliance risk.

The transition from 90791 to 90837 marks the shift from intake to active treatment. Once a diagnosis and treatment plan are in place, a psychology treatment plan template helps formalize ongoing therapy goals, reducing the risk of code mix-ups between the diagnostic and treatment phases of a patient’s episode of care.

Add-on codes that can be billed with CPT 90791

CPT Code 90791 supports one primary add-on code: CPT 90785, the interactive complexity add-on. Not every 90791 encounter qualifies. The clinical criteria must be met and documented, or the add-on claim will be denied.

• CPT 90785 (interactive complexity): Billed in addition to 90791 when the encounter involves specific complicating factors. Qualifying criteria include: mandated reporting or involvement of a third party (such as a guardian or family member active in the session), translation services, evidence of maladaptive communication, or the need to manage threatening behavior. The add-on requires documentation of the specific complicating factor, not just a general note that the session was complex. Practices managing complex psychiatric caseloads through mental health EMR software can build 90785 criteria prompts directly into clinical note templates.
• E/M add-ons: Not applicable with 90791. If a medical evaluation component is added, the correct primary code becomes 90792, not 90791 plus an E/M code.
• Crisis codes (90839, 90840): These are not add-ons to 90791. If a patient enters crisis during the diagnostic evaluation, documentation should reflect whether the encounter transitioned to a crisis intervention service, which would be billed separately per payer guidelines.

Telehealth billing for CPT Code 90791

CPT Code 90791 is on the Medicare telehealth services list, meaning a psychiatric diagnostic evaluation conducted via video can be billed to Medicare. The rules below reflect post-Public Health Emergency policy. Because telehealth regulations have continued to evolve through Congressional action, confirm current requirements with your MAC before billing.

• Modifier 95: Required for synchronous telehealth services billed to Medicare. Append modifier 95 to CPT 90791 when the session was conducted via audio-video connection.
• Modifier GT: Used by some payers and for Medicare Advantage plans. Check your specific payer’s modifier requirements; some commercial insurers still require GT instead of or in addition to 95.
• Audio-only: Medicare has allowed audio-only psychiatric evaluations under certain circumstances. The patient must be in a location with limited access to video technology and must have the right to refuse audio-only services. Audio-only policy remains subject to annual legislative extension; verify before billing.
• Originating site: For Medicare, originating site requirements were waived during the PHE and extended in subsequent legislation. As of 2026, the patient’s home qualifies as an originating site for mental health telehealth services. Confirm the current status of the home-as-originating-site rule for your MAC.
• Place of service code: Use POS 02 (telehealth provided other than in patient’s home) or POS 10 (telehealth provided in patient’s home), depending on where the patient is located.

Practices conducting telehealth psychiatric evaluations should ensure their platform meets HIPAA security requirements. See our HIPAA compliance software guide for a checklist of required safeguards. Pabau’s telehealth software is built with HIPAA-aligned security controls for remote clinical sessions.

Common billing errors with CPT 90791 and how to avoid them

The most expensive 90791 billing mistakes are not the obscure ones. They are the repeatable, systematic errors that recur across every new patient intake unless a practice has explicit safeguards in place. Here are the patterns that generate the most denials.

• Upcoding to 90792: Billing 90792 when no medical services component was present. This is the single highest-risk error and can trigger fraud and abuse review if it appears systematically across claims.
• Billing 90791 for established patients without clinical justification: Most payers treat 90791 as a once-per-episode code. Billing it again for an existing patient without documenting a new episode of care or a clinically significant gap in treatment will be denied. Some payers require a gap of 12-24 months; others require clinical justification. Verify the rule with each payer in your panel.
• Missing or unspecified diagnosis codes: Submitting 90791 with a Z code or an unspecified ICD-10-CM code (for example, F32.9 instead of F32.1) when a more specific diagnosis is supported by the clinical record increases audit risk and may trigger medical necessity denials.
• Incorrect modifiers for telehealth: Failing to append modifier 95 or GT when the session was conducted via video is a straightforward denial cause.
• Duplicate billing: Billing 90791 and 90792 for the same encounter with the same patient on the same date. Only one psychiatric diagnostic evaluation code can be billed per encounter.
• Incomplete MSE: Submitting a claim where the clinical note contains only “mood/affect WNL” without a structured mental status examination. Payers expect a complete MSE at the initial evaluation level.

Practices with high 90791 denial rates should run a denial-reason analysis by claim type. Claims management software with denial tracking can surface these patterns at the practice level, so billing staff can fix systemic documentation errors before they compound across a payer panel.

ICD-10 codes commonly paired with CPT 90791

Every 90791 claim requires at least one supporting ICD-10-CM diagnosis code. The diagnosis must be supported by the clinical documentation; billing the most common code rather than the most accurate one is a documentation integrity issue. Use the most specific code the documentation supports. The AAPC Codify lookup tool is a useful cross-reference for verifying code-to-service pairing.

ICD-10-CM code specificity requirements mean that under-coding (using F32.9 when the record supports F32.1) can flag a claim for medical necessity review just as over-coding can. A coder familiar with DSM-5 criteria alignment should review the ICD-10 selection before billing if the diagnosing clinician is not the billing provider.

How Pabau supports psychiatric diagnostic evaluation billing

Most psychiatric billing errors are documentation errors. The clinical note is complete on paper but missing one element that the payer requires for clean adjudication. Pabau addresses this at the intake stage rather than the claims stage, making it a prevention tool rather than just a billing tool.

Mental health practices using Pabau can configure intake templates to capture every required 90791 documentation element: chief complaint, HPI, psychiatric history, full MSE, risk assessment, diagnosis, and treatment plan. These templates can be sent to patients before the appointment as part of the pre-assessment workflow, or completed by the clinician during the session using structured fields that prevent accidental omissions.

The same platform handles claim generation, so the jump from clinical note to CMS-1500 submission involves no manual re-entry of diagnosis codes or service dates.

For practices billing 90791 across multiple providers with different license types, provider-level billing rules can flag claims where a non-prescribing provider has been assigned a 90792 code.

The practice management software features that matter most for 90791 compliance connect documentation completeness directly to claim submission, rather than treating them as two separate workflows.

See how Pabau streamlines mental health billing

From 90791 intake templates to claims management and denial tracking, Pabau gives mental health practices a single platform for documentation and billing. Book a demo to see how it works for your practice.

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Conclusion

CPT Code 90791 is straightforward in concept but surprisingly easy to misapply in practice. Choosing 90792 when no medical services were performed, billing 90791 repeatedly without clinical justification for a new episode, or submitting with an incomplete mental status examination: these are the errors that drive denial rates up and reimbursement down for mental health practices.

Practice management software like Pabau connects intake documentation directly to claim submission, giving billing staff a clean chain from the clinical note to the CMS-1500. If your practice wants to reduce 90791 denials and build a more consistent psychiatric billing workflow, book a demo to see how Pabau handles it.

Continue your research

Need a structured intake template for psychiatric evaluations? Psychiatric evaluation template provides a step-by-step framework for capturing every required 90791 documentation element.

Need additional structured assessment tools for the diagnostic interview? 16PF questionnaire gives clinicians a validated personality assessment to complement a psychiatric evaluation.

Documenting behavioral observations as part of an evaluation? ABC behavior chart structures antecedent-behavior-consequence notes for the clinical record.

Frequently Asked Questions