ICD-10-CM > R00-R99 > R40-R46 > R40 > R40.2 > R40.2A R40.2A Nontraumatic coma due to underlying condition Billable/Specific Copy Code Copy Description Applicable To Secondary coma Code First underlying condition Type 1 Excludes coma scale, best motor response (R40.24.-)coma scale, best verbal response (R40.22.-)coma scale, eyes open (R40.21.-)Glasgow coma scale, total score (R40.23.-)