Excludes1 pair
T67- vs T88.3-
T67 and T88.3 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.
The official note, declared on T67
malignant hyperpyrexia due to anesthesia (T88.3)
T67
Effects of heat and light
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
T88.3
Malignant hyperthermia due to anesthesia
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T80-T88
Indexed under
- Hyperpyrexia › malignant, due to anesthetic
- Hyperthermia › malignant, due to anesthesia
- Complication › anesthesia, anesthetic › hyperthermia, malignant
- Complication › anesthesia, anesthetic › malignant hyperthermia
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