CPT 99204 for Therapists: New Patient Evaluation Documentation and Time Requirements
Outline
CPT 99204 is among the highest-traffic billing codes any US therapy practice will encounter, yet most psychotherapists never bill it. It is an Evaluation and Management (E/M) code used for a new-patient office visit at moderate medical decision making, and the practitioners who actually charge it are physicians, psychiatrists, psychiatric nurse practitioners, and other prescribing clinicians. Psychologists, LCSWs, LPCs, and LMFTs in independent practice almost always use 90791 instead.
The code still matters for therapists who do not bill it. Referrals from psychiatry consults arrive with 99204 attached. Charts you receive when a client transfers from a multi-disciplinary clinic include the prior new patient evaluation under 99204. Practice owners who employ a psychiatric nurse practitioner or supervising psychiatrist will see 99204 on every new-patient note that prescriber writes. Reading those records well, and writing your own under the right code, is what keeps records, referrals, and billing audits in sync.
This guide covers what CPT 99204 actually is, the four-level E/M structure it sits inside, when 99204 applies to a therapy practice, why 90791 is the right code for most psychotherapy intakes, the documentation requirements for both, and the diagnostic codes most often paired with each. For a wider view of how 99204 fits with the diagnostic codes that appear on the same chart, see the ICD-10 codes for therapists sub-hub.
Educational reference for licensed US therapists, psychologists, counselors, clinical social workers, and the prescribing practitioners who work alongside them. Billing rules vary by payer, state, and license type; verify current requirements with your specific payer and check the CMS Physician Fee Schedule lookup for the active code descriptors and rates.
What CPT 99204 actually is
CPT 99204 is the Current Procedural Terminology code for a new-patient office or outpatient visit that requires a medically appropriate history and examination, moderate-level medical decision making, and (when time is used as the basis for level selection) 45 to 59 minutes of total time on the encounter date. It belongs to the 99202–99205 family of new-patient E/M codes published in the AMA CPT codebook and adopted by CMS for Medicare and most commercial payers.
The 2021 E/M revisions changed how the level is selected. Before 2021, the choice between 99202, 99203, 99204, and 99205 was driven by a three-component scoring rubric that combined history, examination, and medical decision making. The current rules let the billing clinician pick the level based on either medical decision making (MDM) alone or total time alone. The history and examination still need to be medically appropriate to the visit, but they no longer score the level. CMS publishes the current descriptors and the time bands in the 2021 E/M code descriptors PDF, which remains the operative reference.
Two practical consequences follow. First, a 99204 visit no longer requires a fixed number of history elements or a graded examination; the documentation has to support either Moderate MDM or 45 to 59 minutes of total physician time on the date of service. Second, time-based 99204 includes both face-to-face time with the patient and same-day non-face-to-face activities the prescriber performs personally: chart review before the visit, ordering or reviewing labs, prescription writing, and care coordination with the referring therapist, all on the encounter date.
The four 99202–99205 levels at a glance
The four new-patient office-visit codes share the same descriptor structure. They differ on time and on MDM complexity.
| Code | Total time on encounter date | MDM level | Typical use in a therapy practice |
|---|---|---|---|
| 99202 | 15–29 minutes | Straightforward | Brief medication consult, no significant comorbidity |
| 99203 | 30–44 minutes | Low | Standard medication evaluation, single uncomplicated diagnosis |
| 99204 | 45–59 minutes | Moderate | New-patient psychiatric evaluation with comorbidity, prescription decisions, or moderate risk |
| 99205 | 60–74 minutes | High | Complex new-patient evaluation, high-risk medication decisions, multiple severe diagnoses |
In a therapy practice that employs a prescriber, 99204 is the most common new-patient code billed by psychiatric nurse practitioners and psychiatrists because most psychiatric intakes involve at least one prescription decision, at least one comorbidity, and the time band lines up with a standard new-patient hour. 99205 is reserved for high-acuity intakes (active suicidality with medication decisions, complex polypharmacy, severe presentation requiring extensive coordination).
When 99204 applies to a therapy practice
Three categories of clinician inside a therapy practice can legitimately bill 99204 for a new-patient evaluation.
Psychiatric nurse practitioners (PMHNPs) and psychiatrists. A psychiatric NP or psychiatrist conducting a new-patient evaluation that meets the 45 to 59 minute time band or the Moderate MDM threshold bills 99204. This is the most common scenario in integrated therapy practices that offer medication management alongside psychotherapy. The PMHNP or psychiatrist signs the 99204 note; the LCSW or LPC who later sees the same client for psychotherapy bills under their own codes.
APRNs with E/M billing privileges. An advanced practice registered nurse working under their state’s scope-of-practice rules and a payer contract that allows E/M billing can use 99204 for new-patient evaluations within their licensed scope. State scope-of-practice rules vary; a PMHNP independent in one state may require physician supervision in another, and the supervising-physician arrangements can change which NPI appears on the claim.
LCSWs and LPCs in specific E/M-billing settings. A small set of payers and a small set of states allow licensed clinical social workers and licensed professional counselors to bill E/M codes under specific conditions, usually within hospital outpatient departments, federally qualified health centers, or integrated care models with explicit authorisation. This is the exception, not the rule. Verify with your specific payer and state board before billing 99204 as an LCSW or LPC. In most independent therapy practices, the right code for a non-prescribing licensed psychotherapist is 90791.
The categories above describe practitioners inside a mental-health practice. Generalist primary-care prescribers and other medical specialists also bill 99204 routinely, though that use of the code sits outside the scope of what a therapy practice typically manages day to day.
90791 vs 99204: the therapist’s actual choice
For a non-prescribing licensed therapist, the new-patient evaluation code is almost always 90791, the psychiatric diagnostic evaluation code. 90791 is published in the AMA CPT codebook under the psychiatry section. It has no time-based level selection and no medical decision making rubric; it is a single code for a comprehensive diagnostic assessment performed by a mental health professional without medical services.
90792 is the parallel code for prescribers who perform a psychiatric diagnostic evaluation that includes medical services (history of medical conditions, prescription decisions, ordering labs). PMHNPs and psychiatrists choose between 90792 and 99204 based on the visit’s structure and the payer’s preference. Some payers prefer 90792 for the first new-patient visit; others reimburse 99204 at a higher rate.
| Code | Who bills it | Time component | Documentation focus |
|---|---|---|---|
| 90791 | Psychotherapists (no medical services) | Not time-based | Diagnostic impression, MSE, treatment recommendations |
| 90792 | Prescribers (with medical services) | Not time-based | All of 90791 plus medical history and prescription decisions |
| 99204 | Prescribers (E/M framework) | 45–59 min OR Moderate MDM | E/M-format note: history, exam, MDM or total time |
The decision rule for a therapy practice is straightforward. A licensed psychotherapist (psychologist, LCSW, LPC, LMFT) doing a standard new-patient intake bills 90791. A prescriber on staff doing a new-patient evaluation bills 90792 or 99204, depending on payer preference and visit structure.
Documentation requirements for 99204
The 2021 E/M reform simplified what a 99204 chart needs to contain, but the bar is still meaningful. A defensible 99204 note documents either the MDM pathway or the time pathway, and the prescriber selects the level based on whichever approach supports the higher (or more accurate) level for the visit.
MDM pathway. Document Moderate-level medical decision making across the three MDM elements: number and complexity of problems addressed, amount and complexity of data reviewed, and risk of complications from management decisions. Moderate MDM typically looks like a new-patient psychiatric evaluation with one or more chronic illnesses with exacerbation, prescription drug management, or a moderate level of risk from the treatment plan.
Time pathway. Document total time on the encounter date in minutes, with a brief description of how the time was spent. Include face-to-face time with the patient and same-day non-face-to-face activities the prescriber performs personally: chart review, results review, prescription writing, care coordination with the referring therapist, and documentation. Total time must fall within the 45 to 59 minute band for 99204; below 45 minutes drops to 99203 and at or above 60 minutes climbs to 99205.
Either pathway also requires a medically appropriate history and examination. The history and exam no longer score the level, but their absence from the chart undermines the note under audit. A complete 99204 new patient evaluation chart includes the chief complaint, history of present illness, relevant past psychiatric and medical history, medication review, mental status examination, diagnostic impression with ICD-10-CM codes, and the treatment plan.
Documentation requirements for 90791 (the therapy-equivalent)
A 90791 chart serves a different audit framework. The American Psychological Association’s Record Keeping Guidelines and most state licensing boards expect the same content elements regardless of the practice setting.
A defensible 90791 note documents the presenting concern in the client’s words, relevant psychosocial and developmental history, current functioning across role and relationship domains, a mental status examination, a diagnostic impression with the ICD-10-CM code, an explicit risk assessment (suicide, self-harm, harm to others, child or elder safety as applicable), the treatment recommendations, and the clinician’s signature and credentials. The MSE is the section payers and board reviewers read most carefully on a 90791 chart; for the descriptors a board reviewer expects to see, work from a mental status exam cheat sheet.
90791 is not time-based, but most payers expect the evaluation to take 60 minutes or more in practice, and many require a single date of service. Some payers permit 90791 to be split across two sessions with prior authorisation when the clinical complexity warrants it; verify before billing two units. The diagnostic impression on a 90791 chart should pair the clinical formulation with a specific ICD-10-CM code rather than a placeholder or “rule out” diagnosis carried indefinitely.
Common diagnostic codes paired with 99204 and 90791
The same ICD-10-CM codes appear on both 99204 and 90791 charts because the diagnostic universe is the same regardless of the billing framework. The five codes below cover the majority of new-patient evaluations in outpatient mental health.
- F43.23 Adjustment disorder with mixed anxiety and depressed mood. Common at intake when symptoms follow an identifiable stressor and do not meet full criteria for a primary mood or anxiety disorder. For the documentation specifics, see the F43.23 adjustment disorder guide.
- F32.x Major depressive disorder, single episode (specifier digit indicates severity).
- F41.1 Generalized anxiety disorder.
- F90.x Attention-deficit hyperactivity disorder (specifier digit indicates presentation).
- F43.10 Post-traumatic stress disorder, unspecified.
Pair the ICD-10-CM code with the CPT code on the claim (90791 or 99204). The diagnosis substantiates medical necessity; the CPT code identifies the service rendered.
How Emosapien handles 99204 (and 90791) during a new-patient session
During a new patient evaluation, Emosapien’s Scribe Agent works alongside the clinician as an active in-session partner rather than passive transcription. The agent identifies the appropriate CPT code from the session content (90791 for a non-prescribing psychotherapist, 99204 or 90792 for a prescribing practitioner), pre-populates the diagnostic impression with the matched ICD-10-CM code from the formulation, and time-stamps the encounter so the time-pathway documentation for 99204 is captured automatically. The clinician reviews and signs; the agent handles the structural plumbing.
For practices that mix licensed psychotherapists and prescribers under the same roof, the Scribe Agent maps each clinician’s licensure to the appropriate code family before the session starts, so the LCSW’s intake produces a 90791 note and the PMHNP’s intake produces a 99204 or 90792 note without manual code selection.
See how the Scribe Agent fits into a new-patient workflow on the AI clinical notes page, or create a free clinician account to run a 90791 or 99204 evaluation through Emosapien on your next intake.