T31 vs T66
T31 and T66 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 T66
burns (T20-T31)
T31
Burns classified according to extent of body surface involved
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T30-T32
T66
Radiation sickness, unspecified
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
Indexed under
- Irradiation effects, adverse
- Effect, adverse › infraredNOS
- Effect, adverse › radiationNOS
- Effect, adverse › ultravioletNOS
- Radiation › effects NOS
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