Hypersomnia due to medical condition

This code represents excessive daytime sleepiness or prolonged nighttime sleep that is directly attributable to an underlying medical condition. It signifies a secondary form of hypersomnia, where the primary etiology is a diagnosed physical illness or neurological disorder, rather than a primary sleep disorder.

Use this code when documentation clearly links a patient's hypersomnia to a specific medical condition, such as Parkinson's disease, multiple sclerosis, hypothyroidism, or chronic kidney disease. The medical record should explicitly state the causal relationship between the medical condition and the hypersomnia.

• Always sequence the underlying medical condition as the primary diagnosis, followed by this code.
• Do not use this code for hypersomnia due to psychiatric disorders or substance-related causes; use appropriate F-codes instead.
• Ensure the provider's documentation explicitly states "due to" or "secondary to" the medical condition to support the causal link.