T78.4 Other and unspecified allergy

Non-billable header with 3 child codes.

Excludes1 (never code together)

• 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)

Applies from T78 Adverse effects, not elsewhere classified

Excludes2 (not included here)

• complications of surgical and medical care NEC (T80-T88)

7th character note

• The appropriate 7th character is to be added to each code from category T78

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Codes under T78.4

• T78.40 Allergy, unspecified
• T78.41 Arthus phenomenon
• T78.49 Other allergy

Code annotations containing back-references to T78.4

Back-references to T78

• Type 1 Excludes: T75 Other and unspecified effects of other external causes ("adverse effects NEC (T78.-)")

Nearby codes

• T78.2XXS Anaphylactic shock, unspecified, sequela
• T78.3 Angioneurotic edema
• T78.3XXA Angioneurotic edema, initial encounter
• T78.3XXD Angioneurotic edema, subsequent encounter
• T78.3XXS Angioneurotic edema, sequela
• T78.4 Other and unspecified allergy (this code)
• T78.40 Allergy, unspecified
• T78.40XA Allergy, unspecified, initial encounter
• T78.40XD Allergy, unspecified, subsequent encounter
• T78.40XS Allergy, unspecified, sequela
• T78.41 Arthus phenomenon