P80 vs T68
P80 and T68 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 T68
hypothermia of newborn (P80.-)
P80
Hypothermia of newborn
Not billable
- Chapter 16
- Certain conditions originating in the perinatal period
- Section
- P80-P83
T68
Hypothermia
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
Use when the record says
- Accidental hypothermia
- Hypothermia NOS
Indexed under
- Hypothermia (accidental)
- Hypothermia › low environmental temperature (accidental)
- Subnormal, subnormality › temperature
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
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