T79.4 vs T80
T79.4 and T80 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on T79.4
anaphylactic shock due to serum (T80.5-)
T79.4
Traumatic shock
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T79
Use when the record says
- Shock (immediate) (delayed) following injury
Indexed under
- Feeble rapid pulse due to shock following injury
- Decrease › respiration, due to shock following injury (d)
- Hypovolemia › traumatic
- Pulse › feeble, rapid due to shock following injury
- Rapid › feeble pulse, due to shock, following injury
T80
Complications following infusion, transfusion and therapeutic injection
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T80-T88
Use when the record says
- complications following perfusion
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027