ICD-10 Code for Hypersomnia

The default ICD-10-CM 2027 code for hypersomnia (organic) is G47.10 – Hypersomnia, unspecified. More specific codes depend on the details documented, as listed in the official index (27 codes, 27 billable).

Main code: G47.10 – Hypersomnia, unspecified
Billable: Yes

Index entries for Hypersomnia

due to
- alcohol
  - abuse – F10.182
  - dependence – F10.282
  - use – F10.982
- amphetamines
  - abuse – F15.182
  - dependence – F15.282
  - use – F15.982
- caffeine
  - abuse – F15.182
  - dependence – F15.282
  - use – F15.982
- cocaine
  - abuse – F14.182
  - dependence – F14.282
  - use – F14.982
- drug NEC
  - abuse – F19.182
  - dependence – F19.282
  - use – F19.982
- medical condition – G47.14
- mental disorder – F51.13
- opioid
  - abuse – F11.182
  - dependence – F11.282
  - use – F11.982
- psychoactive substance NEC
  - abuse – F19.182
  - dependence – F19.282
  - use – F19.982
- sedative, hypnotic, or anxiolytic
  - abuse – F13.182
  - dependence – F13.282
  - use – F13.982
- stimulant NEC
  - abuse – F15.182
  - dependence – F15.282
  - use – F15.982
idiopathic – G47.11
- with long sleep time – G47.11
- without long sleep time – G47.12
menstrual related – G47.13
nonorganic origin – F51.11
- specified NEC – F51.19
not due to a substance or known physiological condition – F51.11
- specified NEC – F51.19
primary – F51.11
recurrent – G47.13
specified NEC – G47.19

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.