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ICD-10-CM 2027

ICD-10 code for Arthus' phenomenon or reaction

T78.41

Arthus phenomenon

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Arthus' phenomenon or reaction”. Page updated September 29, 2026.

About coding Arthus' phenomenon or reaction

The ICD-10-CM code for Arthus' phenomenon or reaction is T78.41 (Arthus phenomenon).

Within T78.4 (other and unspecified allergy), T78.41 is specifically for Arthus phenomenon. Related codes cover allergy, unspecified (T78.40) and other allergy (T78.49).

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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

More specific Arthus' phenomenon or reaction codes (official index)

  • due to
  • drug

Common questions about Arthus' phenomenon or reaction ICD-10 codes

What is the ICD-10 code for Arthus' phenomenon or reaction?

T78.41 — Arthus phenomenon (a header code; report a more specific subcode).

Is T78.41 billable?

No. T78.41 is a header code. Report one of its more specific subcodes instead.