2025
ICD-10-CM
Diagnosis
Code

T78.4 Other and unspecified allergy

  • Non-billable
  • 2016–2025

T78.4 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Other and unspecified allergy.

Type 1 excludes

  • 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)

Codes

Versions

  1. 2025

    No changes

  2. 2024

    No changes

  3. 2023

    No changes

  4. 2022

    No changes

  5. 2021

    No changes

  6. 2020

    No changes

  7. 2019

    No changes

  8. 2018

    No changes

  9. 2017

    Code changed

    • Type 1 excludes

        • specified types of allergic reaction such as:
        • allergic diarrhea (K52.2)
        • allergic gastroenteritis and colitis (K52.2)
        • dermatitis (L23-L25, L27.-)
        • hay fever (J30.1)
        • 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)

  10. 2016

    New code