1. Home
  2. ICD-10-CM Codes
  3. S00–T88
  4. T66-T78
  5. T78
  6. 2026 ICD-10-CM Code T78.12

2026 ICD-10-CM Diagnosis Code T78.12

Other adverse food reaction due to eggs

ICD-10-CM Code:
T78.12
ICD-10 Code for:
Other adverse food reaction due to eggs
Is Billable?
Not Valid for Submission
Code Navigator:

T78.12 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 eggs. 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.

Specific Coding Applicable to Other adverse food reaction due to eggs

Non-specific codes like T78.12 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 adverse food reaction due to eggs:

  • T78.120 for Other adverse food reaction due to egg with tolerance to baked egg - NON-BILLABLE CODE

  • Use T78.120A for initial encounter - BILLABLE CODE

  • Use T78.120D for subsequent encounter - BILLABLE CODE

  • Use T78.120S for sequela - BILLABLE CODE

  • T78.121 for Other adverse food reaction due to egg with reactivity to baked egg - NON-BILLABLE CODE

  • Use T78.121A for initial encounter - BILLABLE CODE

  • Use T78.121D for subsequent encounter - BILLABLE CODE

  • Use T78.121S for sequela - BILLABLE CODE

  • T78.129 for Other adverse food reaction due to egg with baked egg tolerance/reactivity, unspecified - NON-BILLABLE CODE

  • 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

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

Code History

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