T78.4Non-billable (header)

Other and unspecified allergy

Sub-codes of T78.4(3)

T78.4 is a non-billable header. Select a sub-code to bill. Sub-codes marked ⚠ require a 7th character — append A, D, or S (and an X placeholder if needed).

T78.40Allergy, unspecified⚠ 7th charT78.41Arthus phenomenon⚠ 7th charT78.49Other allergy⚠ 7th char

✗ Excludes 1(Not coded here)

  • •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)

Code Hierarchy

┌19Injury, poisoning and certain other consequences of external causes (S00-T88)├T66-T78Other and unspecified effects of external causes (T66-T78)├T78Adverse effects, not elsewhere classified
└T78.4Other and unspecified allergy

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