Hyperventilation

This code represents a state of abnormally rapid and deep breathing that exceeds the body's metabolic needs, leading to a decrease in arterial carbon dioxide levels (hypocapnia). It is a symptom, not a definitive diagnosis, and often indicates an underlying physiological disturbance.

Use this code when documentation indicates hyperventilation as a presenting symptom or finding, without a clear psychological origin. This includes scenarios such as metabolic acidosis, salicylate poisoning, or central nervous system disorders causing respiratory drive abnormalities. Documentation should clearly state "hyperventilation" and rule out psychogenic causes.

• Do not code this with F45.8 (Psychogenic hyperventilation) as per the Excludes1 note.
• Always seek to code the underlying cause of the hyperventilation if known and documented.
• This code is typically used as a secondary diagnosis, reflecting a symptom rather than a primary condition.