F99 vs R40
F99 (Mental disorder, not otherwise specified) compared with R40 (Somnolence, stupor and coma), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. R40 carries an Excludes2 note covering F99: “symptoms and signs constituting part of a pattern of mental disorder (F01-F99)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F99Mental disorder, not otherwise specified | R40Somnolence, stupor and coma | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Mental disorder, not otherwise specified is a billable ICD-10-CM diagnosis code (F99). | Somnolence, stupor and coma is a non-billable ICD-10-CM category code (R40). |
| Includes | 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