Angioneurotic edema, not elsewhere classified

This code represents a form of acute, localized swelling of the deeper layers of the skin or mucous membranes, often triggered by allergic reactions, medications, or hereditary factors. It is characterized by non-pitting edema that can affect various body parts, including the face, lips, tongue, larynx, extremities, and gastrointestinal tract.

Use this code for documented cases of angioedema where a more specific cause (e.g., allergic, hereditary, drug-induced) is not identified or cannot be definitively coded elsewhere. This applies when the physician's documentation explicitly states "angioneurotic edema, not otherwise specified" or similar phrasing indicating an unspecified etiology.

• Do not use this code if a more specific type of angioedema (e.g., hereditary angioedema, allergic angioedema) is documented.
• Always review the medical record for any underlying cause or associated conditions that may require additional coding.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it is a co-existing condition.