Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2017 onwards.

What has happened to this code

Every change the publisher made, from 2017 to now.

FY2017 Added to the code set Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department

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)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Comatose
Unconscious
Symptoms NEC > involving > awareness > coma
Symptoms NEC > involving > cognitive functions > coma
Coma > specified NEC, without documented Glasgow coma scale score, or with partial Glasgow coma scale score reported

Codes in the same group

Code	Description	Status
R40.2440	Other coma, without documented Glasgow coma scale score, or with partial score reported, unspecified time	Valid
R40.2441	Other coma, without documented Glasgow coma scale score, or with partial score reported, in the field [EMT or ambulance]	Valid
R40.2443	Other coma, without documented Glasgow coma scale score, or with partial score reported, at hospital admission	Valid
R40.2444	Other coma, without documented Glasgow coma scale score, or with partial score reported, 24 hours or more after hospital admission	Valid

At a glance

Code: R40.2442
System: ICD-10-CM
Status: Valid
Valid: FY2017 onwards
In the code set: FY2017 onwards
Part of: R40.244

Where this code sits

Chapter R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Section R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior
Category R40.244 Other coma, without documented Glasgow coma scale score, or with partial score reported
This code R40.2442 Other coma, without documented Glasgow coma scale score, or with partial score reported, at arrival to emergency department

Source

ICD-10-CM FY2027 code set, published by the National Center for Health Statistics (NCHS).

Effective October 1, 2026.

How this site is edited