F29 vs F99
F29 (Unspecified psychosis not due to a substance or known physiological condition) compared with F99 (Mental disorder, not otherwise specified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. F29 carries an Excludes1 note covering F99: “mental disorder NOS (F99)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| F29Unspecified psychosis not due to a substance or known physiological condition | F99Mental disorder, not otherwise specified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) |
| Definition | Unspecified psychosis not due to a substance or known physiological condition is a billable ICD-10-CM diagnosis code (F29). | Mental disorder, not otherwise specified is a billable ICD-10-CM diagnosis code (F99). |
| Includes | Psychosis NOS Unspecified schizophrenia spectrum and other psychotic disorder | Mental illness NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources