R40.0
R40.0: Somnolence
Billable / specific codeICD-10-CM
R40.0 is a billable, specific ICD-10-CM code for somnolence. It is valid for submission on a claim.
Check R40.0 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- coma (R40.2-)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Drowsiness
Excludes1 inherited from the categories above R40.0
A category’s note binds every code beneath it.
Other codes that can never be billed with R40.0
Their own Excludes1 notes name this code, so the conflict is not listed above.
- R41.82Altered mental status, unspecified
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
R40.0 is named in 27 Medicare coverage policies: 27 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A54799Billing and Coding: Urine Drug Testing
- A55001Billing and Coding: Urine Drug Testing
- A56612Billing and Coding: CT of the Head
- A56614Billing and Coding: Psychiatric Inpatient Hospitalization
Alphabetic index entries that lead here
- Drowsiness
- Somnolence
Code history
Unchanged in every release from FY2024 to FY2027.