CPT Code 90791 and 90792: A Complete Guide for Mental Health Professionals

Billing in the mental health field can feel like learning a new language. You spend an hour with a client, listening, assessing, and building a clinical picture. Then, you have to translate all that hard work into a simple five-digit code.

Two of the most common—and most confusing—codes are 90791 and 90792.

If you have ever stared at your billing sheet wondering which one truly fits, you are not alone. These two codes look almost identical. The difference, however, is not just a matter of one number. It impacts your reimbursement rates, your compliance risk, and how auditors view your practice.

Let us break this down in plain English. By the end of this guide, you will know exactly when to use 90791, when to upgrade to 90792, and how to document both like a pro.

Table of Contents

What Are These Codes? A Simple Overview

Before we dive into the weeds, let us look at the big picture. Both codes describe an initial assessment or evaluation performed in a mental health setting.

Think of this as the “first date” with a client. You are not doing therapy yet. You are gathering history, understanding the problem, and figuring out what comes next.

Here is the one-sentence difference:

90791 is an initial diagnostic interview without medical services.
90792 is an initial diagnostic interview including medical services.

That word “medical” changes everything.

Important Note: These codes are for licensed mental health professionals such as psychologists, clinical social workers (LCSW), licensed professional counselors (LPC), and marriage and family therapists (LMFT). They are also used by psychiatrists, but psychiatrists often have additional medical codes available to them.

The Deep Dive: CPT Code 90791

What Happens During a 90791 Session?

Code 90791 represents a comprehensive diagnostic evaluation. You are wearing your detective hat. You are not treating yet; you are understanding.

During a typical 90791 session, you will likely cover:

The presenting problem: Why is the client here today? What made them pick up the phone?
History of present illness: When did symptoms start? How have they evolved?
Psychiatric history: Has this happened before? Previous diagnoses? Past hospitalizations? Medications tried in the past?
Family history: Any mental health conditions in parents or siblings? Substance use?
Social history: Living situation, relationships, work, legal issues, support system.
Substance use history: Alcohol, nicotine, cannabis, illicit drugs, prescription misuse.
Mental status exam (MSE): A structured observation of appearance, behavior, speech, mood, affect, thought process, cognition, and insight.

Who Can Bill 90791?

This code is flexible. It can be billed by:

Psychologists (PhD, PsyD)
Clinical social workers (LCSW, LICSW)
Licensed professional counselors (LPC, LCPC)
Marriage and family therapists (LMFT)
Licensed mental health counselors (LMHC)

The key requirement is that you are licensed to perform independent diagnostic assessments in your state.

Time Requirements for 90791

The CPT codebook does not specify a strict time limit. However, industry standards and payer expectations generally require at least 60 minutes of face-to-face time.

Some commercial insurers expect 60-90 minutes. Medicaid plans vary by state. The most important rule is: document the total time spent and justify that the time was necessary for a comprehensive assessment.

Documentation Must-Haves for 90791

If an auditor knocks on your door, they will look for these specific elements:

Reason for referral: Who sent the client and why?
Detailed history: Biopsychosocial assessment covering past and present.
Mental status exam: At least 5-7 components (appearance, attitude, behavior, mood, affect, speech, thought process, thought content, cognition, insight, judgment).
Risk assessment: Suicidality, homicidality, self-harm, grave disability.
Clinical impression: A provisional or differential diagnosis. If no diagnosis is given, document why (e.g., “rule out,” or “diagnosis deferred pending collateral information”).
Plan: Recommendations for treatment, further testing, or referral.

When NOT to Use 90791

You have already performed a diagnostic evaluation for this client in the past 365 days (for the same issue).
The session was mostly therapeutic intervention, not assessment.
You are not licensed to perform independent evaluations.
You are billing a medical E/M code (like 99203 or 99204) for the same service on the same day.

The Deep Dive: CPT Code 90792

What Makes 90792 Different?

Code 90792 includes everything in 90791, plus one critical addition: medical services.

In plain language, 90792 means you performed the same comprehensive diagnostic interview, but you also:

Conducted a physical exam (or a medically focused review of systems).
Ordered or reviewed medical tests (labs, imaging, EKG, etc.).
Prescribed or managed medications (or made specific medication recommendations).
Performed a medical history review with an emphasis on organic causes of psychiatric symptoms.

Who Can Bill 90792?

This is where many people get confused. Not every clinician can bill 90792.

Typically, you can only bill 90792 if you are a:

Psychiatrist (MD or DO)
Psychiatric nurse practitioner (PMHNP)
Physician assistant (PA) working in psychiatry
Other medical doctor (e.g., neurologist or family physician) performing psychiatric assessment

Critical Note: Psychologists and licensed clinical social workers generally cannot bill 90792 because they cannot provide medical services (like physical exams or medication management) within their scope of practice. Doing so would be fraudulent.

What Does “Medical Services” Actually Mean?

The term “medical services” scares some non-physician clinicians. Let us clarify what counts.

For a psychiatrist or PMHNP, medical services might include:

A brief physical examination (e.g., checking vital signs, neurological screening).
Ordering labs (e.g., thyroid panel, vitamin B12, drug screen).
Reviewing previous medical records for conditions that mimic mental illness (e.g., thyroid disease, brain tumor, sleep apnea).
Assessing medication side effects (e.g., tardive dyskinesia screening with AIMS).
Prescribing a medication during the same visit.
Medical decision making (MDM) regarding medication safety.

For non-medical providers: even if you ask about medical history, you are not providing “medical services.” You are collecting information. That is still 90791, not 90792.

Time Requirements for 90792

Like 90791, there is no official CPT time floor. However, most payers expect 45-75 minutes of face-to-face time. The medical component often adds complexity, so a typical 90792 session runs closer to 60 minutes or more.

Again, document your total time.

Documentation Must-Haves for 90792

You need everything required for 90791, plus medical documentation:

Review of systems (ROS): A checklist or narrative of symptoms by body system (neurological, endocrine, cardiovascular, etc.).
Physical exam findings: Even if brief (e.g., “VSS, oriented, no focal deficits, normal gait”).
Medical history: Past surgeries, chronic illnesses, allergies, current medications (including OTC and supplements).
Medical decision making (MDM): The complexity of interpreting medical data, ruling out organic causes, and managing medications.
Prescription or medication order: If applicable. If no medication was prescribed, document why (e.g., “Patient declined medication” or “Will defer pending labs”).

When NOT to Use 90792

You are a non-medical clinician.
You did not perform any billable medical service (asking “Do you have any medical problems?” is not enough).
You are double-billing with a separate E/M code for the same visit.
The primary purpose of the visit was therapy, not assessment.

Head-to-Head Comparison: 90791 vs. 90792

Let us put these two codes side by side. This table will save you hours of confusion.

Feature	CPT 90791	CPT 90792
Service type	Diagnostic interview (non-medical)	Diagnostic interview with medical services
Who can bill	Psychologists, LCSW, LPC, LMFT, LMHC	Psychiatrists, PMHNP, PA, MD/DO
Medical exam required?	No	Yes (even if brief)
Medication management?	No	Yes (can prescribe or review)
Physical exam?	No	Yes (or documented review of systems)
Typical reimbursement	Lower (e.g., $80 –$ 80–150)	Higher (e.g., $120 –$ 120–250+)
Time expectation	60 minutes (typical)	45–75 minutes (typical)
Audit risk	Moderate (documentation-heavy)	High (must prove medical necessity)
Can non-MD bill?	Yes	No (except PMHNP, PA)

Reimbursement Note: The dollar amounts above are rough estimates. Actual payment varies wildly by insurance company, geographic location, and individual contracts. Always check your fee schedule.

The 800-Pound Gorilla: Medical Necessity

You can pick the right code. You can document perfectly. But if medical necessity is missing, you will not get paid—or worse, you will get a clawback.

Medical Necessity for 90791

For 90791, medical necessity is straightforward: the client has signs or symptoms of a mental health condition that warrant a full diagnostic assessment before treatment begins.

Examples of medical necessity for 90791:

“Patient reports low mood, anhedonia, and sleep disturbance for 6 weeks.”
“Adolescent with school refusal and separation anxiety symptoms.”
“Recent trauma exposure with intrusive thoughts and hypervigilance.”

If the client is simply “curious about therapy” or wants “life coaching,” 90791 is not appropriate. That is not medically necessary.

Medical Necessity for 90792

For 90792, you need to prove why a medical assessment was required, not just a psychological one.

Examples of medical necessity for 90792:

“Rule out organic cause: new-onset psychosis at age 55.”
“Medication evaluation: patient with bipolar disorder requesting a mood stabilizer.”
“Medical complexity: patient with diabetes and depression, current meds causing hypoglycemia.”
“Physical exam indicated: patient with catatonia or movement disorder signs.”

Red Flag: Billing 90792 for a straightforward depression screening with no medical component is a quick way to trigger an audit.

Common Billing Mistakes (And How to Avoid Them)

Even experienced clinicians mess these up. Here are the top five errors I see in practice audits.

Mistake #1: Using 90792 as a Psychologist

This is fraud. Plain and simple. Unless you have prescriptive authority (which only a handful of states grant to psychologists with additional training, like Louisiana, New Mexico, Illinois, Iowa, and Idaho), you cannot bill 90792.

Fix: Use 90791 and document your medical history questions as “collateral information,” not a medical service.

Mistake #2: Billing 90791 for a Follow-Up Visit

These codes are for initial assessments only. Some clinicians try to use them for annual re-assessments. That is incorrect.

Fix: Use psychotherapy codes (90832, 90834, 90837) for follow-ups, or medication management codes (99212-99215) if you are a prescriber.

Mistake #3: No Mental Status Exam

Your note must include an MSE. I have seen audits where the entire claim was denied because the clinician wrote “MSE normal.” That is not enough.

Fix: Write at least 7 elements. Example: “Alert and oriented x4. Cooperative. Psychomotor calm. Mood ‘anxious.’ Affect constricted. Speech normal rate and volume. Thought process linear. Denies SI/HI. Insight fair. Judgment intact.”

Mistake #4: The “Medical Service” Is Just a Question

If you are a prescriber and you bill 90792, you need to show you did something medical beyond a verbal question.

Fix: Document a physical exam finding (e.g., “PERRL, EOMI, no nystagmus”) or a review of systems (e.g., “ROS negative for focal weakness, headache, vision changes”).

Mistake #5: Upcoding for More Money

Some clinicians rationalize: “This was a tough assessment, so I deserve the higher rate.” That is not how coding works.

Fix: Bill based on what you did, not how you feel. If you did not perform a medical service, use 90791.

Reimbursement and Payer Policies

Let us talk money, because that is why you are reading this.

Typical Reimbursement Ranges

Based on 2024-2025 data from multiple commercial payers (UnitedHealthcare, Aetna, Cigna, Blue Cross Blue Shield) and Medicare:

Payer Type	90791 (non-facility)	90792 (non-facility)
Medicare (national avg)	~ $90 -$ 90−110	~ $130 -$ 130−160
Medicaid (varies by state)	~ $60 -$ 60−120	~ $90 -$ 90−180
Commercial insurance	~ $100 -$ 100−180	~ $150 -$ 150−250+
Self-pay (cash)	$150 -$ 150−300 (typical)	$200 -$ 200−500 (typical)

Note: Facility rates (e.g., billing from a hospital or community mental health center) are significantly lower, often 50-70% of non-facility rates.

Medicare Rules for 90791 and 90792

Medicare is picky. Here is what you need to know:

Medicare covers 90791 for psychologists, clinical social workers, and other eligible providers.
Medicare covers 90792 only when billed by a psychiatrist, PMHNP, or PA (physician assistant).
Medicare expects a face-to-face service. Telehealth rules have changed post-PHE (Public Health Emergency); check your local coverage determination (LCD).
Medicare does not require a referral from a primary care doctor for these codes, but some Medicare Advantage plans might.

Commercial Payer Quirks

UnitedHealthcare: Usually covers both codes but requires documented medical necessity. They audit 90792 heavily.
Aetna: Allows non-physician clinicians to bill 90791 but explicitly states that 90792 requires a medical provider.
Cigna: Generally follows CPT guidelines closely. They expect time documentation.
Blue Cross Blue Shield (varies by state): Some BCBS plans allow psychologists to bill 90792 if they work in a “integrated care setting” under a psychiatrist’s supervision. Verify your specific state plan.

Self-Pay and Sliding Scale Recommendations

If you are a cash-pay practice, you set your own rates. However, be reasonable.

Many self-pay clinicians charge 200−200−300 for 90791.
For 90792 (if you are a prescriber), 300−300−500 is common in high-cost areas (NYC, LA, San Francisco).

Pro tip: Offer a bundled initial assessment package. For example, “$350 for 90791 + 15-minute follow-up call to review results.” Clients appreciate predictability.

Documentation Examples (Real-World Scenarios)

Let me show you exactly how a good note looks for each code.

Example: 90791 Note (Clinical Psychologist)

Client: John, 34-year-old male, self-referred for “feeling stuck.”

Chief Complaint: “I have lost interest in everything for the past two months.”

HPI: John reports gradual onset of anhedonia, fatigue, poor concentration, and feelings of worthlessness. Symptoms began after a job loss. Denies suicidal ideation. Sleep is fragmented, waking at 3 AM nightly. Appetite decreased, lost 8 lbs unintentionally.

Psychiatric History: No previous diagnoses. No prior therapy. No psychotropic medications.

Substance Use: Alcohol 2-3 beers on weekends. No illicit drugs. No nicotine.

Family History: Mother with depression (treated with sertraline). Father with alcohol use disorder.

Social History: Lives alone. Works as graphic designer (currently unemployed). Supportive sister locally. No legal issues.

Mental Status Exam:

Appearance: Casual dress, well-groomed, tired appearing.
Attitude: Cooperative, good eye contact.
Behavior: Psychomotor slowed.
Speech: Normal rate, low volume.
Mood: “Numb.”
Affect: Constricted, non-reactive.
Thought process: Linear and goal-directed.
Thought content: Rumination about job loss. Denies paranoia, delusions, obsessions.
Cognition: Alert and oriented x4. Attention fair (missed 2/5 digits backwards). Memory intact for recent events.
Insight: Fair (acknowledges problem but blames external factors).
Judgment: Good (seeking help, no self-harm).
Suicidal/Homicidal ideation: Denies both. No plan or intent.

Risk Assessment: Low risk for self-harm. No protective factors identified (lives alone, unemployed). Will monitor closely.

Diagnosis: F32.0 Major Depressive Disorder, single episode, mild.

Plan:

Begin weekly psychotherapy (CPT 90837) focusing on behavioral activation.
Referral to primary care for thyroid and vitamin D labs to rule out medical causes.
Safety plan created.
Follow-up in 1 week.

Time: 65 minutes face-to-face.

Billed: 90791

Example: 90792 Note (Psychiatrist)

Client: Maria, 28-year-old female, referred by PCP for “possible ADHD or anxiety.”

Chief Complaint: “I cannot focus at work and my heart races all the time.”

HPI: Maria reports 18 months of difficulty concentrating, restlessness, and irritability. Also reports palpitations, sweaty palms, and feeling “on edge.” Symptoms worse under deadlines. No childhood ADHD symptoms (good grades, no disciplinary issues). No manic episodes. No psychosis.

Psychiatric History: No prior psychiatric care. No medications.

Substance Use: Caffeine 4-5 cups coffee/day. No alcohol, no drugs.

Medical History: Mild intermittent asthma (albuterol PRN). No surgeries. Allergies: penicillin (rash).

Review of Systems (ROS):

Neurological: No headaches, no seizures, no numbness.
Endocrine: No heat/cold intolerance, no weight change.
Cardiovascular: Palpitations daily, no chest pain.
Respiratory: No shortness of breath at rest.

Physical Exam (brief):

VS: BP 128/84, HR 98, RR 14, Temp 98.2.
General: Well-nourished, anxious appearing.
Neuro: CN II-XII intact. No tremor. Reflexes symmetric.
Psych: As per MSE below.

Mental Status Exam:

Alert and oriented x3. Cooperative. Psychomotor restless (leg bouncing). Speech rapid, pressured. Mood “panicky.” Affect anxious. Thought process linear. Thought content: worries about performance, no paranoia. Cognition: Attention poor (serial 7s: 3 errors). Insight: Partial. Judgment: Fair. Denies SI/HI.

Medical Decision Making (MDM):

Problem: Anxiety symptoms with palpitations.
Data: ROS and brief physical exam performed. Caffeine overuse identified.
Risk: Moderate (symptoms causing functional impairment).
Organic causes: Palpitations may be anxiety or cardiac. Will order labs to rule out hyperthyroidism.

Labs Ordered: TSH, free T4, CBC, CMP, thyroid antibodies.

Assessment: R/O Generalized Anxiety Disorder vs. Hyperthyroidism. Rule out ADHD (unlikely given late onset).

Plan:

Hold off medication pending labs.
Reduce caffeine to 1 cup/day for 1 week.
Follow-up in 2 weeks with lab results.
Start therapy referral for CBT.

Time: 55 minutes face-to-face.

Billed: 90792

Telehealth and These Codes

Can you bill 90791 or 90792 via telehealth?

Short answer: Yes, but with caveats.

Current Telehealth Rules (2024-2025)

Medicare: Coverage for 90791 and 90792 via telehealth has been extended through December 31, 2024, under the Consolidated Appropriations Act of 2023. After that, depends on congressional action. For now, you can bill them for audio-video telehealth. Audio-only (telephone) is generally not allowed for initial assessments except in very specific circumstances (e.g., client lacks technology access).
Medicaid: Varies by state. Most states allow 90791 via telehealth. Some restrict 90792 due to the medical exam requirement (you cannot do a physical exam over video).
Commercial payers: Most large payers (UHC, Aetna, Cigna, BCBS) allow 90791 via telehealth permanently. For 90792, some require that a physical exam was performed either in-person within a reasonable timeframe (e.g., 30 days) or that the medical component was conducted via history only with no physical exam required.

The Physical Exam Problem for 90792

You cannot perform a hands-on physical exam via telehealth. So how do you bill 90792?

Solutions:

Split visit: Do the diagnostic interview via telehealth (billing a “telehealth modifier 95” with 90792) and document that a physical exam will occur at a future in-person visit. Some payers accept this.
History only: Document a very thorough review of systems and state that no physical exam was necessary because the patient had a recent PCP exam. Some payers accept this.
In-person requirement: Schedule the initial assessment in person for 90792. Use telehealth only for follow-ups.

Warning: Do not assume your payer allows telehealth 90792. Call their provider line and ask: “Does your plan reimburse 90792 with modifier 95 when no physical exam is performed?”

Frequently Asked Questions (FAQ)

Q1: Can a psychologist bill 90792 if they work in a hospital?

No. The setting does not change your scope of practice. Unless you have independent prescriptive authority or you are performing a physical exam (which psychologists cannot do), you cannot bill 90792.

Q2: What is the difference between 90791 and an E/M code like 99204?

Great question. E/M codes (99202-99205) are for medical assessments in primary care or other medical settings. They require a chief complaint, history, exam, and medical decision making. Psychiatric diagnostic assessments use 90791/90792. You cannot bill both for the same visit. Choose one.

Q3: Can I bill 90791 and a therapy code on the same day?

Generally, no. The CPT manual and most payers consider the initial assessment a “stand-alone” service. If you try to add a therapy code (e.g., 90834) on the same day, you will likely get a denial for “bundled services.” The exception is if a crisis occurs that requires unrelated intervention (rare).

Q4: How often can I bill 90791 for the same patient?

Typically once per provider per 365 days for the same condition. If the patient returns after a year with a completely new problem (e.g., trauma instead of depression), some payers allow a new 90791. But expect pushback. Many clinicians use a lower-level code like 90832 for a “re-assessment.”

Q5: What modifier do I use for telehealth with 90791 or 90792?

Use modifier 95 (Synchronous telemedicine service rendered via real-time interactive audio and video telecommunications system). For Medicare, use the place of service (POS) code 02 (Telehealth provided other than at patient’s home) or POS 10 (Telehealth provided at patient’s home) depending on where the patient is located.

Q6: Does insurance require a referral from a PCP for 90791?

Rarely. Most commercial plans and Medicare do not require a formal referral. However, some HMO plans (like Kaiser) and certain Medicaid managed care plans do. Check the patient’s insurance card or call the payer.

Q7: What happens if I accidentally bill 90792 instead of 90791?

If an auditor catches it, you will have to refund the difference. If it looks like a pattern (e.g., you bill 90792 every time), you could face charges of upcoding fraud. Fix it by submitting a corrected claim with the proper code.

Q8: Can I bill 90791 for a child or adolescent?

Yes. These codes are age-neutral. However, documentation for children should include developmental history, school records, collateral from parents/teachers, and often a play-based or age-appropriate MSE.

Q9: What if the patient leaves mid-assessment?

You cannot bill a full 90791 or 90792. Instead, you might bill an “unlisted psychiatric service” code (e.g., 90899) with documentation of the time spent and reason for termination. Most clinicians simply eat the cost and reschedule.

Q10: Do I need to include a risk assessment every time?

Yes. For any initial assessment, you must document that you assessed for risk of harm to self or others. If you forget, auditors will assume you did not do it. A simple line like “Denies suicidal ideation, homicidal ideation, or self-harm behaviors. No plan or intent. Low risk.” is sufficient for low-risk clients.

Additional Resources

To help you stay current with coding rules and reimbursement changes, here is a trusted external resource:

🔗 American Medical Association (AMA) – CPT Code 90791 and 90792 Official Descriptors
Visit the AMA website and search for the specific CPT codes to view the official language and yearly updates. This is the definitive source.

Other helpful resources:

CMS.gov – For Medicare telehealth and payment policies.
American Psychological Association (APA) Practice Central – For psychology-specific billing guidance.
Your state’s Medicaid provider manual – Search “[Your State] Medicaid fee schedule 90791.”

Important Notes for Readers

📌 Disclaimer: This article is for educational purposes only. Coding and billing rules change frequently. Payers have different interpretations of the same CPT code. Always verify policies with your specific insurance contracts and consult a certified medical coder or billing attorney for complex cases.

📌 Scope of practice is not optional. Billing a code that requires medical services when you are not a medical provider is insurance fraud. Do not risk your license.

📌 Documentation saves lives and lawsuits. A well-written note protects you in an audit and, more importantly, ensures continuity of care for your patient.

📌 When in doubt, downcode. If you are unsure between 90791 and 90792, choose the lower code. It is easier to explain an under-billed claim than an over-billed one.

Conclusion

CPT code 90791 is your go-to for a comprehensive diagnostic interview when you are a non-medical mental health professional. CPT code 90792 adds a medical component and is reserved for psychiatrists, nurse practitioners, and physician assistants. Choose based on your scope of practice and what you actually did—not what pays more.