All ICD10 Codes
T78Non-billable

Adverse effects, not elsewhere classified

Injury, Poisoning and Certain Other Consequences of External Causes·Other and unspecified effects of external causes (T66-T78)·category·FY 2026

Use a more specific code (3 billable, 3 non-billable)
T78.0Anaphylactic reaction due to foodhas subcodesT78.1Other adverse food reactions, not elsewhere classifiedhas subcodesT78.2Anaphylactic shock, unspecifiedT78.3Angioneurotic edemaT78.4Other and unspecified allergyhas subcodesT78.8Other adverse effects, not elsewhere classified

CH19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
Use Additional Code
  • code to identify any retained foreign body, if applicable (Z18.-)

T66-T78 Parent Instructions

Code Also
  • , if applicable, place of occurrence, such as:
  • highway rest stop (Y92.523)
  • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
  • service areas as the place of occurrence of the external cause (Y92.52-)
  • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
  • transport vehicle as the place of occurrence of the external cause (Y92.81-)

Instructional Notes

Excludes2(Not included here. Code separately if applicable.)
  • complications of surgical and medical care NEC (T80-T88)

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T66-T78Other and unspecified effects of external causes (T66-T78)
T78Adverse effects, not elsewhere classifiedNot billable
T78.0Anaphylactic reaction due to foodSubcodes
T78.1Other adverse food reactions, not elsewhere classifiedSubcodes
T78.2Anaphylactic shock, unspecifiedBillable
T78.3Angioneurotic edemaBillable
T78.4Other and unspecified allergySubcodes
T78.8Other adverse effects, not elsewhere classifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.