R40.0 vs R40.2
R40.0 (Somnolence) compared with R40.2 (Coma), 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. R40.0 carries an Excludes1 note covering R40.2: “coma (R40.2-)”
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
| R40.0Somnolence | R40.2Coma | |
|---|---|---|
| Billing status | Billable | Non-billable header Report instead: R40.20, R40.2110, R40.2111, R40.2112, R40.2113 |
| Classification | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Somnolence is a billable ICD-10-CM diagnosis code (R40.0). | Coma is a non-billable ICD-10-CM category code (R40.2). |
| Includes | Drowsiness | — |
| Code first | — | any associated: fracture of skull (S02.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources