ICD-10 Code for Coma
The ICD-10-CM code for coma is R40.20 — Unspecified coma. This is the code the Alphabetic Index gives for coma with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
BillableUnspecified
R40.20 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which coma code should you use?
The Alphabetic Index lists 22 codes under Coma. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| myxedematous | E03.5 | Myxedema coma | |
| newborn | P91.5 | Neonatal coma | |
| nontraumatic, due to underlying condition | R40.2A | Nontraumatic coma due to underlying condition | |
| persistent vegetative state | R40.3 | Persistent vegetative state | |
| secondary | R40.2A | Nontraumatic coma due to underlying condition | |
| specified NEC, without documented Glasgow coma scale score, or with partial Glasgow coma scale score reported | R40.244 | Other coma, without documented Glasgow coma scale score, or with partial score reported | not billable |
Coma with
| motor response | R40.231 | Coma scale, best motor response, none | not billable |
| opening of eyes | R40.211 | Coma scale, eyes open, never | not billable |
| verbal response | R40.221 | Coma scale, best verbal response, none | not billable |
| motor response › abnormal | R40.233 | Coma scale, best motor response, abnormal flexion | not billable |
| motor response › abnormal extensor posturing to pain or noxious stimuli | R40.232 | Coma scale, best motor response, extension | not billable |
| motor response › abnormal flexure posturing to pain or noxious stimuli | R40.233 | Coma scale, best motor response, abnormal flexion | not billable |
| motor response › extension | R40.232 | Coma scale, best motor response, extension | not billable |
| motor response › extensor posturing to pain or noxious stimuli | R40.232 | Coma scale, best motor response, extension | not billable |
| motor response › flexion/decorticate posturing | R40.233 | Coma scale, best motor response, abnormal flexion | not billable |
| motor response › flexion withdrawal | R40.234 | Coma scale, best motor response, flexion withdrawal | not billable |
| motor response › localizes pain | R40.235 | Coma scale, best motor response, localizes pain | not billable |
| motor response › normal or spontaneous movement | R40.236 | Coma scale, best motor response, obeys commands | not billable |
| motor response › obeys commands | R40.236 | Coma scale, best motor response, obeys commands | not billable |
| motor response › withdraws from pain or noxious stimuli | R40.234 | Coma scale, best motor response, flexion withdrawal | not billable |
| motor response › withdraws to touch | R40.235 | Coma scale, best motor response, localizes pain | not billable |
| opening of eyes › spontaneous | R40.214 | Coma scale, eyes open, spontaneous | not billable |
| verbal response › confused conversation | R40.224 | Coma scale, best verbal response, confused conversation | not billable |
| verbal response › cooing or babbling or crying appropriately | R40.225 | Coma scale, best verbal response, oriented | not billable |
| verbal response › inappropriate crying or screaming | R40.223 | Coma scale, best verbal response, inappropriate words | not billable |
| verbal response › inappropriate words | R40.223 | Coma scale, best verbal response, inappropriate words | not billable |
| verbal response › incomprehensible sounds | R40.222 | Coma scale, best verbal response, incomprehensible words | not billable |
| verbal response › incomprehensible words | R40.222 | Coma scale, best verbal response, incomprehensible words | not billable |
| verbal response › irritable cries | R40.224 | Coma scale, best verbal response, confused conversation | not billable |
| verbal response › moans/grunts to pain; restless | R40.222 | Coma scale, best verbal response, incomprehensible words | not billable |
| verbal response › oriented | R40.225 | Coma scale, best verbal response, oriented | not billable |
| verbal response › screaming | R40.223 | Coma scale, best verbal response, inappropriate words | not billable |
| verbal response › uses appropriate words | R40.225 | Coma scale, best verbal response, oriented | not billable |
| motor response › score of › 1 | R40.231 | Coma scale, best motor response, none | not billable |
| motor response › score of › 2 | R40.232 | Coma scale, best motor response, extension | not billable |
| motor response › score of › 3 | R40.233 | Coma scale, best motor response, abnormal flexion | not billable |
| motor response › score of › 4 | R40.234 | Coma scale, best motor response, flexion withdrawal | not billable |
| motor response › score of › 5 | R40.235 | Coma scale, best motor response, localizes pain | not billable |
| motor response › score of › 6 | R40.236 | Coma scale, best motor response, obeys commands | not billable |
| opening of eyes › in response to › pain | R40.212 | Coma scale, eyes open, to pain | not billable |
| opening of eyes › in response to › sound | R40.213 | Coma scale, eyes open, to sound | not billable |
| opening of eyes › score of › 1 | R40.211 | Coma scale, eyes open, never | not billable |
| opening of eyes › score of › 2 | R40.212 | Coma scale, eyes open, to pain | not billable |
| opening of eyes › score of › 3 | R40.213 | Coma scale, eyes open, to sound | not billable |
| opening of eyes › score of › 4 | R40.214 | Coma scale, eyes open, spontaneous | not billable |
| verbal response › score of › 1 | R40.221 | Coma scale, best verbal response, none | not billable |
| verbal response › score of › 2 | R40.222 | Coma scale, best verbal response, incomprehensible words | not billable |
| verbal response › score of › 3 | R40.223 | Coma scale, best verbal response, inappropriate words | not billable |
| verbal response › score of › 4 | R40.224 | Coma scale, best verbal response, confused conversation | not billable |
| verbal response › score of › 5 | R40.225 | Coma scale, best verbal response, oriented | not billable |
Coma hypoglycemic
| nondiabetic | E15 | Nondiabetic hypoglycemic coma |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources