ICD-10-CM 2027
ICD-10 code for acute transient psychosis
From the official ICD-10-CM alphabetic index entry “Psychosis, psychotic › acute (transient)”. Page updated September 29, 2026.
About coding acute transient psychosis
The ICD-10-CM code for acute transient psychosis is F23 (Brief psychotic disorder). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on F23.
The conditions in its Excludes2 note aren't part of F23, but may be coded alongside it if the patient has both: mood [affective] disorders with psychotic symptoms (F30.2, F31.2, F31.5, F31.64, F32.3, F33.3).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific acute transient psychosis codes (official index)
- hysterical F44.9 — Dissociative and conversion disorder, unspecified
Common questions about acute transient psychosis ICD-10 codes
What is the ICD-10 code for acute transient psychosis?
- F23 — Brief psychotic disorder. More specific codes apply when the documentation supports them: F44.9.
What is the ICD-10 code for hysterical acute transient psychosis?
- F44.9 — Dissociative and conversion disorder, unspecified.
Is F23 billable?
- Yes. F23 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F23 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F23 as a principal diagnosis.
Is F23 a CC or MCC?
- F23 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.