T78: Adverse effects, not elsewhere classified
T78.4: Other and unspecified allergy

excludes1
specified types of allergic reaction such as:
allergic diarrhea (K52.29)
allergic gastroenteritis and colitis (K52.29)
dermatitis (L23-L25, L27.-)
food protein-induced enterocolitis syndrome (K52.21)
food protein-induced enteropathy (K52.22)
hay fever (J30.1)
T78.40: Allergy, unspecified
T78.41: Arthus phenomenon
T78.49: Other allergy

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