T67 vs T88.3
T67 and T88.3 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 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 (of unknown origin)
- Complication › anesthesia, anesthetic › hyperthermia, malignant (s) (from) (of)
- Complication › anesthesia, anesthetic › malignant hyperthermia (s) (from) (of)
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