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T78.4

⚠ Non-billable (Header)

Other and unspecified allergy

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with T78.4

  • • 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)

⚠️ Excludes2

inherited from T78

Rules from parent category T78: Adverse effects, not elsewhere classified

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

Child Codes (3)

T78.40Allergy, unspecifiedT78.41Arthus phenomenonT78.49Other allergy

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Code Information

CodeT78.4
BillableNo — Header code
ParentT78
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes17 rule(s)
Excludes21 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)