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T78.4

Non-billable

Other and unspecified allergy

T78.4 is the ICD-10-CM code for Other and unspecified allergy. It is a non-billable category code — use a more specific child code such as T78.40 for billing.

Status
Header (non-billable)
Chapter
S00-T88
Parent
T78
Subcodes
3
Edition
FY2026

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

Excludes1 — 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)

Frequently asked questions

What is ICD-10 code T78.4?
T78.4 is the ICD-10-CM code for "Other and unspecified allergy". It falls under S00-T88 Injury, poisoning and certain other consequences of external causes.
Is T78.4 a billable code?
No — T78.4 is a non-billable header code. Use a more specific child code (such as T78.40) for billing.
What are the subcodes of T78.4?
T78.4 has 3 more specific child codes, including T78.40, T78.41, T78.49.
What is excluded from T78.4?
Excludes1 (not coded here): specified types of allergic reaction such as:; allergic diarrhea (K52.29); allergic gastroenteritis and colitis (K52.29); dermatitis (L23-L25, L27.-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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