ICD-10 Code G47.14 – Hypersomnia due to medical condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.14 – Hypersomnia due to medical condition
What it is
G47.14 identifies excessive sleepiness caused by an underlying medical condition. Use it when the hypersomnia is documented as secondary to another disorder, not as a primary sleep disorder.
Clinical signs
Patients may report persistent daytime sleepiness, prolonged sleep time, or difficulty staying awake despite adequate opportunity for sleep. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider clearly links hypersomnia to a medical condition such as a neurologic, endocrine, or other systemic disorder. It also applies when the record states sleepiness is secondary to a known condition and not explained by poor sleep habits alone.
Code the underlying condition separately when documented. If the chart does not specify the cause, check documentation before assigning G47.14.
Do not use for
Do not use this code for primary hypersomnia, narcolepsy, or simple fatigue without documented excessive sleepiness. Do not use it when the cause is unclear.
Coding tip
Confirm the medical condition causing the hypersomnia is explicitly documented before coding G47.14.