T78.19 Other adverse food reactions, not elsewhere classified

The ICD-10-CM code for Other adverse food reactions, not elsewhere classified is T78.19 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

19: Injury, poisoning and certain other consequences of external causes (S00-T88)

Section

T66-T78: Other and unspecified effects of external causes (T66-T78)

Category T78

35 codes (27 billable)

FY2026 Status

New code in FY2026

Also Known As

ICD-10-CM Alphabetic Index entries that lead to T78.19:

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

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool