Excludes1 pair
T88.7- vs T88.8-
T88.7 and T88.8 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
T88.7
Unspecified adverse effect of drug or medicament
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T80-T88
Use when the record says
- Drug hypersensitivity NOS
- Drug reaction NOS
Indexed under
- Complication › chemotherapy NEC (antineoplastic)
- Complication › drug NEC
- Damage › medication
- Effect, adverse › drugs and medicaments
- Hypersensitive, hypersensitiveness, hypersensitivity › drug
T88.8
Other specified complications of surgical and medical care, not elsewhere classified
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T80-T88
Indexed under
- Paraffinoma
- Misadventure › specified NEC
- Complication › electroshock therapy › specified NEC
- Complication › phototherapy › specified NEC
- Effect, adverse › medical care › specified NEC
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