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T78.41

⚠ Non-billable (Header)

Arthus phenomenon

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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Also Known As

Arthus reaction

❌ Excludes1

inherited from T78.4

Rules from parent category T78.4: Other and unspecified allergy

  • • 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)

Child Codes (3)

T78.41XAArthus phenomenon, initial encounterT78.41XDArthus phenomenon, subsequent encounterT78.41XSArthus phenomenon, sequela

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Code Information

CodeT78.41
BillableNo — Header code
ParentT78.4
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes17 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)