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R40.20 - Unspecified coma


The ICD 10 Code for Unspecified coma is listed as R40.20.
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: R40.20
Description: Unspecified coma
  • Coma NOS
  • Unconsciousness NOS
Diagnostic Related Groups
(MS-DRG v30.0)
080 - Nontraumatic Stupor & Coma W Mcc
081 - Nontraumatic Stupor & Coma W/o Mcc
793 - Full Term Neonate W Major Problems
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 R40.2 - Coma
ICD-9-CM Diagnosis Codes General Equivalence Mappings (GEMS):
ICD 9 Dx Code: 780.01 - Coma (approximate)
ICD-10-CM Siblings (same level / similar specificity) of R40.20:
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