Idio sleep related nonobstructive alveolar hypoventilation

This code describes a rare, chronic respiratory disorder characterized by insufficient breathing during sleep, leading to elevated carbon dioxide levels (hypoventilation) without any identifiable obstruction in the upper airway. The "idiopathic" nature signifies that the underlying cause of this central nervous system dysfunction affecting respiratory drive is unknown. Patients typically experience symptoms such as daytime sleepiness, morning headaches, and fatigue.

Use this code when documentation explicitly states a diagnosis of idiopathic sleep-related nonobstructive alveolar hypoventilation. This diagnosis is typically established after polysomnography (sleep study) demonstrates hypoventilation and hypercapnia during sleep, and other causes of sleep-disordered breathing, such as obstructive sleep apnea or neuromuscular disorders, have been ruled out.

• Ensure documentation clearly specifies "idiopathic" and "nonobstructive" to differentiate from other forms of sleep hypoventilation.
• Do not confuse with obstructive sleep apnea (G47.33) or other specified sleep apnea (G47.39) which have different underlying etiologies.
• Consider sequencing this code as the primary diagnosis when it is the main reason for the encounter or hospitalization.