Hypnic headache

This code represents hypnic headache, a rare primary headache disorder characterized by headaches that exclusively awaken the patient from sleep. These headaches typically occur at a consistent time during the night, often in the early morning hours, and resolve within a few hours of waking.

Use this code when documentation clearly indicates a diagnosis of hypnic headache, distinguishing it from other sleep-related headaches or secondary causes. This diagnosis is typically made based on the patient's history of headaches occurring only during sleep and resolving upon awakening, often after ruling out other conditions.

• Ensure documentation specifies the headache occurs only during sleep to differentiate from other headache types.
• Do not confuse with other primary headaches like migraine or cluster headache, even if they sometimes occur at night.
• Consider co-occurring sleep disorders or other conditions that might contribute to nocturnal headaches and code them separately if documented.