Angioneurotic edema, sequela

This code identifies the long-term or residual effects of angioneurotic edema, a condition characterized by sudden, localized swelling of the deeper layers of the skin and mucous membranes. These sequelae represent persistent issues that remain after the acute phase of the angioedema has resolved, such as chronic scarring, organ damage, or functional impairment.

Apply this code when documenting conditions that are a direct consequence of a previous episode of angioneurotic edema and are no longer acute. This includes scenarios where a patient presents with chronic laryngeal stenosis due to recurrent angioedema, or persistent gastrointestinal issues attributed to prior intestinal angioedema. It is used when the acute angioedema has subsided, but its lasting impact is still present.

• Always sequence this code after the code(s) identifying the specific sequela (e.g., chronic urticaria, esophageal stricture).
• Ensure documentation clearly links the current condition as a residual effect of a past angioneurotic edema episode.
• Do not use this code for acute or active angioneurotic edema; instead, use codes from the T78.3 category without the "S" seventh character.