CPT 90791 vs 90792: Stop Losing Revenue on Psych Evals

At Revenant Care Group, we review billing data across roughly 50 behavioral health practices at any given time, and the pattern we see consistently is this: practices are either under-coding 90792 when they have a legitimate prescriber performing the evaluation, or they are incorrectly billing 90791 under a psychiatrist’s NPI and watching those claims deny quietly in the background. Neither scenario is small money. For a mid-sized outpatient BH practice billing 80 to 120 diagnostic evaluations per month, the annual revenue gap between getting this right and getting it wrong runs between $18,000 and $34,000 in net collections.

This post breaks down the actual clinical and billing distinctions between CPT 90791 and CPT 90792, where the denials come from, how payers are auditing these codes in 2026, and what your team should be doing differently starting this week. No theory. Just the mechanics that move money.

The Core Distinction: What Separates 90791 from 90792

CPT 90791 is the psychiatric diagnostic evaluation without medical services. It covers a comprehensive assessment of psychiatric history, mental status, and relevant medical and social history. It does not include the ordering or management of medications, physical examination components, or the prescriptive decision-making that characterizes a medical encounter. This code is correctly billed by licensed clinical social workers (LCSWs), licensed professional counselors (LPCs), psychologists, and in many states, licensed marriage and family therapists (LMFTs), as well as by physicians and advanced practice providers when no medical services component is rendered.

CPT 90792 is the psychiatric diagnostic evaluation with medical services. The “with medical services” language is not decoration. It means the evaluating provider performed and documented a medical service component, which includes a physical examination relevant to the psychiatric presentation, ordering of diagnostic labs or medications, or a prescriptive decision with documented clinical reasoning. This code is restricted to physicians (MD or DO), nurse practitioners (NPs), and physician assistants (PAs) operating within their prescriptive scope of practice. A psychologist billing 90792, in virtually all states, is billing an incorrect code regardless of how thorough the evaluation was.

The Reimbursement Difference and Why It Matters at Scale

For 2026, the national Medicare non-facility rate for CPT 90791 is approximately $166 to $172 depending on geographic locality. CPT 90792 reimbursement runs approximately $215 to $228 under the same conditions. That is a per-claim difference of roughly $45 to $58. Commercial payers typically apply a multiplier of 115% to 140% of Medicare rates for these codes, so the spread widens further.

At POS 11 (office), both codes are reported without modifier requirements in most standard scenarios. However, if your prescribing NP is providing the evaluation via telehealth, POS 02 (telehealth provided other than in patient’s home) or POS 10 (telehealth provided in patient’s home) applies for 2026, and some payers require modifier 95 in addition to the POS change. We see a 12% to 18% denial rate specifically on 90792 telehealth claims where the practice is using POS 11 out of habit rather than updating for the encounter location.

If your psychiatrist is performing 40 evaluations per month and your billing team is defaulting to 90791 instead of 90792, you are leaving approximately $1,900 to $2,800 per month on the table on that provider alone. Across a group practice with three prescribers, that compounds to $68,000 to $100,000 annually in recoverable revenue before you even touch denial recovery.

Where Payers Are Auditing in 2026

The pattern we are seeing from commercial payer post-payment audits, particularly from Cigna, Aetna, and several regional BCBS plans, is a focus on 90792 claims where the rendering provider is a psychologist or LCSW. These audits are not subtle. The payer pulls the credential on file for the billing NPI, cross-references the taxonomy code, and flags any 90792 claim where the provider type does not support medical services. If your credentialing team loaded a psychologist with a 103T00000X taxonomy but your billing team coded 90792, you have a recoverable overpayment exposure, not just a denial.

A secondary audit target is 90792 claims without corresponding medical decision-making documentation. If your psychiatrist’s evaluation note does not contain a documented physical exam finding, a medication initiation or adjustment decision with rationale, or a diagnostic workup order, the claim is technically miscoded as 90792. Document the medical services component explicitly. A single line that reads “medication trial initiated pending evaluation results” is not sufficient. The note must reflect the clinical reasoning that constitutes a medical service.

Parity compliance intersects here as well. If your practice is receiving systematic downgrades from 90792 to 90791 without clinical justification from a payer, that pattern may constitute a parity violation under MHPAEA, particularly when the payer does not apply similar scrutiny to analogous medical evaluation codes. We have written in detail about how to document and appeal these patterns at our MHPAEA parity appeals resource.

The Modifier and POS Errors We Catch on Audit

When we run a denial audit for a new behavioral health client, the 90791 and 90792 bucket almost always contains the same cluster of errors:

• Wrong POS for telehealth evaluations: Using POS 11 when the patient was seen at home via video. POS 10 is required for most payers in 2026 for patient-home telehealth.
• Modifier 95 missing: Several commercial payers still require modifier 95 appended to 90792 for synchronous telehealth even when POS 10 or POS 02 is correct.
• Credential-code mismatch: Billing 90792 under a rendering NPI whose taxonomy does not support prescriptive authority.
• Duplicate code with 90837: Some practices bill 90791 and 90837 on the same date of service for the same provider. Most payers will bundle these, denying the 90837 or both. The evaluation code is not a therapy session, and the two should not routinely appear together on day one.
• Group practice NPI vs. individual NPI routing errors: Billing Group NPI on box 33 without individual NPI in box 24J, causing credential validation to fail at the payer level.

What Your Billing Team Should Do This Week

Pull a 90-day report of all 90791 and 90792 claims. Filter by rendering provider taxonomy code. Identify every 90792 claim rendered by a provider whose taxonomy does not include prescriptive authority. That is your immediate recoupment risk. Next, pull all 90792 telehealth claims and verify POS code accuracy by date of service. For claims denied in the last 120 days, verify whether a corrected claim or appeal is still within your payer’s timely filing window, which for most commercial plans runs 90 to 180 days from the original denial date.

If you have NPs or psychiatrists who routinely see new patients, audit five recent 90792 notes for explicit documentation of the medical services component. If those notes would not survive a payer audit, the fix is clinical documentation education, not a billing team workaround.

For practices that also run SUD services, the same precision requirement applies to your lab billing. If you are not maximizing revenue on drug screening codes alongside your evaluation billing, our guide on G0480-G0483 coding outlines where SUD practices are consistently under-coding and how to recover that revenue correctly.

The Revenue Recovery Math for Your Practice Size

For a solo psychiatry practice billing 30 evaluations per month, correcting a systematic 90791 versus 90792 coding error and resolving 90-day telehealth POS denials typically yields $800 to $1,400 in monthly recovered collections. For a group practice with five to eight prescribers billing 150 to 250 evaluations monthly, the same correction applied systematically runs $4,200 to $9,500 in additional monthly net revenue once denials are worked and corrected claims are adjudicated. These are not projections. They are the ranges we document in writing when we complete a denial audit for new clients in this code category.

Ready to See Your Actual Numbers?

If you are a CFO, RCM director, or practice administrator who wants to know exactly where your 90791 and 90792 claims are leaking, we run a free 30-day denial audit that maps every denial by code, payer, and root cause. No commitment required. You will leave the audit with a prioritized list of recoverable revenue and the specific actions required to capture it. Book your audit time here and we will have your data ready before the call.