Coma

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 6 more specific codes instead:

R40.20 Unspecified coma
R40.21 Coma scale, eyes open (also a header)
R40.22 Coma scale, best verbal response (also a header)
R40.23 Coma scale, best motor response (also a header)
R40.24 Glasgow coma scale, total score (also a header)
R40.2A Nontraumatic coma due to underlying condition

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2012 Added to the draft code set draft Coma

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from R40 Somnolence, stupor and coma

Excludes1 - never coded here

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)

Inherited from the R40-R46 section Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)

Excludes2 - not included here

symptoms and signs constituting part of a pattern of mental disorder (F01-F99)

Codes in the same group

Code	Description	Status
R40.0	Somnolence	Valid
R40.1	Stupor	Valid
R40.3	Persistent vegetative state	Valid
R40.4	Transient alteration of awareness	Valid