R40.243Glasgow coma scale score 3-8

R40.243 is the ICD-10-CM diagnosis code for Glasgow coma scale score 3-8. It belongs to category R40 (Somnolence, stupor and coma), block R40-R46 (symptoms and signs involving cognition, perception, emotional state and behavior) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within R40.24 (Glasgow coma scale, total score), R40.243 is specifically for Glasgow coma scale score 3-8. Related codes cover Glasgow coma scale score 13-15 (R40.241), Glasgow coma scale score 9-12 (R40.242) and other coma, without documented Glasgow coma scale score, or with partial score reported (R40.244).

Codes in this range require a 7th character: 0 for unspecified time, 1 for in the field [EMT or ambulance], 2 for at arrival to emergency department, 3 for at hospital admission and 4 for 24 hours or more after hospital admission. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2017 (expanded into subcodes).