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ICD-10-CM 2027

ICD-10 code for allergic edema

T78.3

Angioneurotic edema

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Edema, edematous (infectious) (pitting) (toxic) › allergic”. Page updated September 29, 2026.

About coding allergic edema

The ICD-10-CM code for allergic edema is T78.3 (Angioneurotic edema).

Within T78 (adverse effects, not elsewhere classified), T78.3 is specifically for Angioneurotic edema. Related codes cover anaphylactic reaction due to food (T78.0), other adverse food reactions, not elsewhere classified (T78.1), anaphylactic shock, unspecified (T78.2), other and unspecified allergy (T78.4) and other adverse effects, not elsewhere classified (T78.8).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Don't report T78.3 together with the conditions in its Excludes1 note: serum urticaria (T80.6-) and urticaria (L50.-).

Don't confuse with (Excludes1 for T78.3)

Common questions about allergic edema ICD-10 codes

What is the ICD-10 code for allergic edema?

T78.3 — Angioneurotic edema (a header code; report a more specific subcode).

Is T78.3 billable?

No. T78.3 is a header code. Report one of its more specific subcodes instead.