Angioneurotic edema, subsequent encounter

This code signifies angioedema, a condition characterized by sudden, localized swelling of the deeper layers of the skin and mucous membranes, occurring during a subsequent phase of treatment or recovery. It represents a non-allergic or allergic reaction that has been previously diagnosed and is now being managed or monitored.

Apply this code when a patient presents for follow-up care, medication adjustments, or monitoring of angioedema after initial treatment. This includes visits for ongoing management of chronic angioedema or for evaluation of persistent symptoms following an acute episode. It is appropriate for encounters where the patient is no longer in the acute phase of the condition.

• Ensure documentation clearly indicates that this is not the initial encounter for the angioedema.
• Always code the underlying cause of the angioedema, if known, as a primary diagnosis.
• Consider additional codes for specific manifestations or complications of the angioedema if documented.