R40.0
BillableSomnolence
R40.0 is the ICD-10-CM code for Somnolence. It is a billable, specific code valid for reimbursement.
R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
What this means — in plain language
MedlinePlus · NIHWhat is sleep? While you are sleeping your brain and body functions are still active. Sleep is a natural process that helps your body restore energy, supports learning and memory, and keeps you healthy. It's not just the number of hours of sleep you get that matters. The quality of your sleep is also important. During the night, your brain cycles through different stages of non-rapid eye movement (non-REM) sleep and…
Read more about Sleep Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •Drowsiness
Excludes1 — not coded here
- •coma (R40.2-)
Conditions mapped to this code
MedlinePlus · NIHPlain-language health-topic references grounded in MedlinePlus (NIH/NLM).
Frequently asked questions
- What is ICD-10 code R40.0?
- R40.0 is the ICD-10-CM code for "Somnolence". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
- Is R40.0 a billable code?
- Yes — R40.0 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from R40.0?
- Excludes1 (not coded here): coma (R40.2-).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
Look up another ICD-10 code or condition