R40.2
Non-billableComa
Coma
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
Code First
The underlying condition must be sequenced before this code
- any associated:
- •fracture of skullS02
- •intracranial injuryS06
Child Codes (6)
Related Codes(4)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(9)
Frequently Asked Questions
What is the ICD-10 code for coma?
The ICD-10-CM code for coma is R40.2. The full clinical description is "Coma". R40.2 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code R40.2 mean?
ICD-10-CM code R40.2 represents “Coma”. It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a non-billable header code. Use a more specific child code for billing purposes.
Is R40.2 a billable code?
No, R40.2 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 6 child codes under R40.2.
What chapter is R40.2 in?
R40.2 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R40.2?
R40.2 has Excludes1 notes indicating codes that cannot be used together with it, including: neonatal coma (P91.5); somnolence, stupor and coma in diabetes (E08-E13); somnolence, stupor and coma in hepatic failure (K72.-); and 1 more.
What are the subcategories under R40.2?
R40.2 has 6 child codes, including: R40.20 (Unspecified coma), R40.21 (Coma scale, eyes open), R40.22 (Coma scale, best verbal response), R40.23 (Coma scale, best motor response), and 2 more.
What are the UMLS CUIs for R40.2?
R40.2 is linked to 1 UMLS Concept Unique Identifier: C0009421. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does R40.2 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like coma affect a person's functioning: body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of R40.2?
R40.2 maps to the ICD-11 code: MB20.1 (Coma).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.