Nontraumatic coma due to underlying condition
Billable / specificHCC V28 202
R40.2A is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Applicable to
- Secondary coma
Includes (from R40)
- Note: This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Note: Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- Note: The conditions and signs or symptoms included in categories R00-R94 consist of:
- Note: (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- Note: (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- Note: (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- Note: (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- Note: (e) cases in which a more precise diagnosis was not available for any other reason;
- Note: (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Includes (from R40.2)
Excludes1
Not coded here — never report together with this code.
- 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.-)
- neonatal coma (P91.5) (from R40)
- somnolence, stupor and coma in diabetes (E08-E13) (from R40)
- somnolence, stupor and coma in hepatic failure (K72.-) (from R40)
- somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15) (from R40)
Excludes2
Not included here — may be reported together when both conditions exist.
- abnormal findings on antenatal screening of mother (O28.-) (from R40)
- certain conditions originating in the perinatal period (P04-P96) (from R40)
- signs and symptoms classified in the body system chapters (from R40)
- signs and symptoms of breast (N63, N64.5) (from R40)
- symptoms and signs constituting part of a pattern of mental disorder (F01-F99) (from R40)
Code first
Sequence the underlying condition first.
Also known as
- Secondary coma
- Coma, nontraumatic, due to underlying condition
- Coma, secondary
Parent code
- R40.2ComaHeader