F99 vs R42
F99 (Mental disorder, not otherwise specified) compared with R42 (Dizziness and giddiness), 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. R42 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 | R42Dizziness and giddiness | |
|---|---|---|
| Billing status | Billable | Billable |
| 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). | Dizziness and giddiness is a billable ICD-10-CM diagnosis code (R42). |
| Includes | Mental illness NOS | Light-headedness Vertigo NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources