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R40.2 - Coma


The ICD 10 Code for Coma is listed as R40.2.
Additional information concerning this code and description can be found below including ICD 9 crosswalks / GEMS, chapter information, and DRGs where available.

ICD 10 CM Field Value
Diagnosis Code: R40.2
Description: Coma
  • Code first any associated:
  • fracture of skull (S02.-)
  • intracranial injury (S06.-)
  • Note: One code from subcategories R40.21-R40-23 is required to complete the coma scale
Chapter Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
Parent R40 - Somnolence, stupor and coma
ICD-10-CM Children (deeper level / typically more specific) of R40.2:
R40.20 - Unspecified coma
R40.21 - Coma scale, eyes open
R40.22 - Coma scale, best verbal response
R40.23 - Coma scale, best motor response
R40.24 - Glasgow coma scale, total score
ICD-10-CM Siblings (same level / similar specificity) of R40.2:
R40.0 - Somnolence
R40.1 - Stupor
R40.3 - Persistent vegetative state
R40.4 - Transient alteration of awareness