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ICD-10-CM 2027

ICD-10 code for oral allergy syndrome

T78.19

Other adverse food reactions, not elsewhere classified

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Syndrome › oral allergy”. Page updated September 29, 2026.

About coding oral allergy syndrome

The ICD-10-CM code for oral allergy syndrome is T78.19 (Other adverse food reactions, not elsewhere classified).

Within T78.1 (other adverse food reactions, not elsewhere classified), T78.19 is specifically for other adverse food reactions, not elsewhere classified. Related codes cover reactions due to milk and dairy products (T78.11) and reaction due to eggs (T78.12).

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.

It was added in FY2026, effective October 1, 2025.

Common questions about oral allergy syndrome ICD-10 codes

What is the ICD-10 code for oral allergy syndrome?

T78.19 — Other adverse food reactions, not elsewhere classified (a header code; report a more specific subcode).

Is T78.19 billable?

No. T78.19 is a header code. Report one of its more specific subcodes instead.