F29 Unspecified psychosis not due to a substance or known physiological condition

The ICD-10-CM code for Unspecified psychosis not due to a substance or known physiological condition is F29 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Section

F20-F29: Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders (F20-F29)

Category F29

1 code (1 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to F29:

• Psychosis, psychotic
• Schizophrenia, schizophrenic › spectrum and other psychotic disorder
• Psychosis, psychotic › nonorganic
• Psychosis, psychotic › confusional
• Disorder (of) › schizophrenia spectrum and other psychotic disorder

Inclusion Terms

• Psychosis NOS
• Unspecified schizophrenia spectrum and other psychotic disorder

U.S. Hospital Utilization

• An estimated 100,735 U.S. inpatient stays in 2023 included F29 among the documented diagnoses.
• 41,030 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Pain disorders related to psychological factors (TOC entry)

a. Pain disorders related to psychological factors ..................................................................... 43

Psychoactive substance use disorders (TOC entry)

b. Mental and behavioral disorders due to psychoactive substance use ................................... 43

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)