R40 ICD-10-CM Code: Somnolence, stupor and coma
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
R40Somnolence, stupor and coma
ICD-10-CM diagnosis code · United States clinical modification
Where R40 sits
- 1
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- 2
Section
Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
- 3
Category R40
Somnolence, stupor and coma
- 4
Code R40
Somnolence, stupor and coma
Codes under R40
R40 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for R40.
Code first
No “code first” instruction is listed for R40.
Use additional code
No “use additional code” instruction is listed for R40.
Excludes1
Conditions that should not be reported together with this code.
- neonatal coma (P91.5)
- somnolence, stupor and coma in diabetes (E08-E13)
- somnolence, stupor and coma in hepatic failure (K72.-)
- somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for R40.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code R40 mean?
R40 is the FY 2027 U.S. ICD-10-CM code for “Somnolence, stupor and coma.”
Is R40 a billable or specific ICD-10-CM code?
No. R40 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is R40 located in ICD-10-CM?
R40 is listed in Chapter 18, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), within Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46) (R40–R46), under category R40, Somnolence, stupor and coma.
What coding notes are listed for R40?
No inclusion terms are listed for R40 in this reference record. No code-first instruction is listed. Excludes1 notes: neonatal coma (P91.5); somnolence, stupor and coma in diabetes (E08-E13); somnolence, stupor and coma in hepatic failure (K72.-); somnolence, stupor and coma in hypoglycemia (nondiabetic) (E15). No Excludes2 note is listed.