ICD-10 Code G47.10 – Hypersomnia, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.10 – Hypersomnia, unspecified
What it is
G47.10 identifies hypersomnia when the record does not specify a cause or subtype. Use it for excessive sleepiness or prolonged sleep that is documented without a more specific diagnosis.
Clinical signs
Typical findings include excessive daytime sleepiness, long sleep periods, and difficulty staying awake during routine activities. Clinical features vary; refer to documentation.
When to use this code
Use this code when the clinician documents hypersomnia but does not name narcolepsy, sleep apnea, medication effect, or another explained cause. It also fits cases where the chart simply states “hypersomnia” or “excessive sleepiness” without further detail.
Do not use for
Do not use it when the cause of sleepiness is documented, such as sleep apnea, narcolepsy, or a medication-related disorder. Check documentation.
Coding tip
Code the more specific sleep disorder first if the provider identifies one; use G47.10 only when hypersomnia remains unspecified.