R40.0
BillableSomnolence
Somnolence
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Drowsiness
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
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(52)
SNOMED CT
- Post-fit state31758001
- Post-ictal state31758001
- Post-seizure state31758001
- Postictal state31758001
- Cerebral depression in newborn87227007
- Newborn cerebral depression87227007
- Drowsiness of the newborn95631006
- Neonatal drowsiness95631006
- Neonatal somnolence95631006
- Somnolence of the newborn95631006
- Disorder of excessive somnolence194439006
- Keeps falling asleep248219002
- Gets drowsiness267088000
- Drowsiness271782001
- Drowsy271782001
- Mental status, drowsy271782001
- Sleepiness271782001
- Sleepy271782001
- Somnolence271782001
- Somnolence (sleepiness)271782001
- Post-ictal drowsiness313432002
- Intermittent drowsiness315243006
- Somnolence syndrome370971007
- Excessive somnolence372947007
- Daytime somnolence141000119100
Clinical Terms
- Disorder of excessive somnolence
- Intermittent drowsiness
- Somnolence syndrome
- Sleepiness
- Cerebral depression in newborn
- Daytime somnolence
- Somnolence (sleepiness)
- Newborn cerebral depression
- Postictal state
- Neonatal somnolence
- Keeps falling asleep
- Excessive somnolence
- Somnolence of the newborn
- Drowsiness of the newborn
- Drowsiness
- Mental status, drowsy
- Gets drowsiness
- Post-fit state
- Post-ictal state
- Drowsy
- Post-ictal drowsiness
- Neonatal drowsiness
- Post-seizure state
- Sleepy
Frequently Asked Questions
What is the ICD-10 code for somnolence?
The ICD-10-CM code for somnolence is R40.0. The full clinical description is "Somnolence". R40.0 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code R40.0 mean?
ICD-10-CM code R40.0 represents “Somnolence”. It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a billable/specific code that can be used on a claim.
Is R40.0 a billable code?
Yes, R40.0 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is R40.0 in?
R40.0 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R40.0?
R40.0 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 2 more.
What SNOMED CT codes does R40.0 map to?
R40.0 maps to 12 SNOMED CT concepts: 87227007, 141000119100, 194439006, 271782001, 95631006, and 7 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for R40.0?
R40.0 is linked to 1 UMLS Concept Unique Identifier: C2830004. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does R40.0 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like somnolence 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 R40.0?
R40.0 maps to the ICD-11 code: MG42 (Somnolence, not elsewhere classified).
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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.