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  6. 2026 ICD-10-CM Code T78.19

2026 ICD-10-CM Diagnosis Code T78.19

Other adverse food reactions, not elsewhere classified

ICD-10-CM Code:
T78.19
ICD-10 Code for:
Other adverse food reactions, not elsewhere classified
Is Billable?
Not Valid for Submission
Code Navigator:

T78.19 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 reactions, not elsewhere classified. 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 reactions, not elsewhere classified

Non-specific codes like T78.19 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 reactions, not elsewhere classified:

  • Use T78.19XA for initial encounter - BILLABLE CODE

  • Use T78.19XD for subsequent encounter - BILLABLE CODE

  • Use T78.19XS 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

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)
      • food (any) (ingested) NEC
    • Allergy, allergic(reaction) (to)
      • gastrointestinal
        • meaning other adverse food reaction not elsewhere classified
    • Effect, adverse
      • foodstuffs
    • Reaction
      • adverse
        • food (any) (ingested) NEC
    • Syndrome
      • oral allergy

Code History

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