Behavioral health CPT codes and the documentation each one requires
The core psychotherapy CPT codes, their time thresholds, and what the note must contain for each one to survive review. Written for clinicians, not billers.
The short answer
The core outpatient psychotherapy CPT codes are 90791 for diagnostic evaluation, 90832 for 16 to 37 minutes of psychotherapy, 90834 for 38 to 52 minutes, 90837 for 53 minutes or more, 90846 and 90847 for family psychotherapy without and with the client present, and 90853 for group psychotherapy. Each requires documented start and stop times or total duration, plus clinical content matching the service billed.
Key takeaways
- Time is the most audited element in psychotherapy coding. Record duration, not just a code.
- 90837 is not higher risk because it is wrong. It is higher risk because it is scrutinised.
- The note must describe a service consistent with the code, not merely last long enough for it.
- Group and family codes carry individualisation requirements that shared notes routinely fail.
Clinicians are rarely taught coding, and billers rarely sit in sessions. The gap between them is where most behavioral health revenue leaks. This is the clinician's half of the problem: what each code asserts, and what the note has to show to support it.
Core outpatient codes
| Code | Service | Time | Documentation must show |
|---|---|---|---|
| 90791 | Psychiatric diagnostic evaluation | No time threshold | History, mental status exam, diagnostic formulation, initial plan |
| 90832 | Psychotherapy | 16 to 37 min | Duration, modality, intervention, response, plan |
| 90834 | Psychotherapy | 38 to 52 min | As above; the most commonly billed psychotherapy code |
| 90837 | Psychotherapy | 53 min or more | As above, plus a clear clinical reason the extended session was indicated |
| 90846 | Family psychotherapy, client not present | 50 min typical | Whose treatment plan is being served and how |
| 90847 | Family psychotherapy, client present | 50 min typical | Individual client objectives addressed within the family session |
| 90853 | Group psychotherapy | Varies | Individualised content for the specific client, not a shared group summary |
| 90785 | Interactive complexity add-on | Add-on | The specific complicating factor present during the encounter |
Extended sessions are legitimate and often clinically correct. They also draw review, because a practice billing 90837 almost exclusively looks like a billing pattern rather than a clinical one. The defence is not to avoid the code. It is to document, in each note, why that client on that day required the extended session.
Time documentation
The most common finding in psychotherapy coding review is not the wrong code. It is a code with nothing in the note to support the time it asserts. Record either start and stop times, or total face-to-face duration, in every note. 'Session held' with no duration cannot support a timed code at all.
Where a session runs to a boundary between two codes, the note should make the actual duration explicit rather than leaving it to be inferred. A 52-minute session and a 53-minute session are different codes.
Group and family notes
Group psychotherapy is where documentation most often collapses at scale. A single group summary copied into eight charts is efficient, common, and one of the most reliably cited findings in behavioral health audits.
Each client's note must show what that client did, how they responded, and how the session connected to their own treatment plan. The shared portion, describing the group's theme and structure, can be identical. The individualised portion cannot.
Group discussed relapse prevention. Client participated appropriately.
Client identified two personal high-risk situations (payday and family gatherings) and committed to a specific avoidance plan for the coming week. This addresses Objective 1 of their plan, developing situational relapse prevention strategies. Client initiated contribution twice without prompting, an increase from previous sessions.
Where clinical and coding disagree
The most dangerous documentation state is a note whose clinical content contradicts its own claim. Common examples worth checking before signing:
- The note describes a family session; the claim codes an individual session.
- The note documents 45 minutes; the claim bills a 53-minute code.
- The note describes a crisis contact; the claim codes routine psychotherapy.
- The claim carries an interactive complexity add-on; the note names no complicating factor.
- The diagnosis on the claim does not appear anywhere in the clinical record.
None of these require a coding qualification to catch. They require someone to read the note and the claim side by side before submission, which is precisely the check most practices have no time to perform.
Frequently asked
Both are individual psychotherapy codes distinguished by time. 90834 covers 38 to 52 minutes and 90837 covers 53 minutes or more. Both require documented duration and clinical content consistent with the service billed.
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