ICD-10-CM · Chapter 18 · R00-R99
R40 Somnolence, stupor and coma
Excludes 1 (cannot be coded together)
- neonatal coma (P91.5)
- somnolence, stupor and coma in diabetes (E08-E13)
- somnolence, stupor and coma in hepatic failure (K72.-)
- somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| R40..0 | Somnolence | Yes |
| R40..1 | Stupor | Yes |
| R40..2 | Coma | No |
| R40..20 | Unspecified coma | Yes |
| R40..21 | Coma scale, eyes open | No |
| R40..211 | Coma scale, eyes open, never | No |
| R40..212 | Coma scale, eyes open, to pain | No |
| R40..213 | Coma scale, eyes open, to sound | No |
| R40..214 | Coma scale, eyes open, spontaneous | No |
| R40..22 | Coma scale, best verbal response | No |
| R40..221 | Coma scale, best verbal response, none | No |
| R40..222 | Coma scale, best verbal response, incomprehensible words | No |
| R40..223 | Coma scale, best verbal response, inappropriate words | No |
| R40..224 | Coma scale, best verbal response, confused conversation | No |
| R40..225 | Coma scale, best verbal response, oriented | No |
| R40..23 | Coma scale, best motor response | No |
| R40..231 | Coma scale, best motor response, none | No |
| R40..232 | Coma scale, best motor response, extension | No |
| R40..233 | Coma scale, best motor response, abnormal flexion | No |
| R40..234 | Coma scale, best motor response, flexion withdrawal | No |
| R40..235 | Coma scale, best motor response, localizes pain | No |
| R40..236 | Coma scale, best motor response, obeys commands | No |
| R40..24 | Glasgow coma scale, total score | No |
| R40..241 | Glasgow coma scale score 13-15 | No |
| R40..242 | Glasgow coma scale score 9-12 | No |
| R40..243 | Glasgow coma scale score 3-8 | No |
| R40..244 | Other coma, without documented Glasgow coma scale score, or with partial score reported | No |
| R40..2A | Nontraumatic coma due to underlying condition | Yes |
| R40..3 | Persistent vegetative state | Yes |
| R40..4 | Transient alteration of awareness | Yes |
Last reviewed: September 2026