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  6. 2026 ICD-10-CM Code T78.120

2026 ICD-10-CM Diagnosis Code T78.120

Other adverse food reaction due to egg with tolerance to baked egg

ICD-10-CM Code:
T78.120
ICD-10 Code for:
Other advrs food react d/t egg with tolerance to baked egg
Is Billable?
Not Valid for Submission
Code Navigator:

T78.120 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 tolerance to baked egg. 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 advrs food react d/t egg with tolerance to baked egg

Non-specific codes like T78.120 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 tolerance to baked egg:

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

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

  • Use T78.120S 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

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Other adverse food reaction due to egg with reactivity to baked egg T78.121

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
          • with
            • tolerance to baked egg

Code History

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