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  6. 2026 ICD-10-CM Code T78.129

2026 ICD-10-CM Diagnosis Code T78.129

Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified

ICD-10-CM Code:
T78.129
ICD-10 Code for:
Other advrs food react d/t egg with baked egg tol/rct, unsp
Is Billable?
Not Valid for Submission
Code Navigator:

T78.129 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified. The code is not specific and is NOT valid for the year 2026 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like T78.129 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Other advrs food react d/t egg with baked egg tol/rct, unsp

Non-specific codes like T78.129 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other advrs food react d/t egg with baked egg tol/rct, unsp:

  • Use T78.129A for initial encounter - BILLABLE CODE

  • Use T78.129D for subsequent encounter - BILLABLE CODE

  • Use T78.129S for sequela - BILLABLE CODE

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    S00–T88
    • Other and unspecified effects of external causes
      T66-T78
      • Adverse effects, not elsewhere classified
        T78

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

  • Allergic reaction caused by egg protein

Coding Guidelines

The appropriate 7th character is to be added to each code from block Adverse effects, not elsewhere classified (T78). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Index of External Cause of Injuries

References found for this diagnosis code in the External Cause of Injuries Index:

    • Allergy, allergic(reaction) (to)
      • eggs
        • adverse reaction NEC

Code History

  • FY 2026 - No Change, effective from 10/1/2025 through 9/30/2026