R53.8 vs T73.3
R53.8 and T73.3 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 R53.8
exhaustion and fatigue due to excessive exertion (T73.3)
R53.8
Other malaise and fatigue
Not billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R50-R69
T73.3
Exhaustion due to excessive exertion
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
Use when the record says
- Exhaustion due to overexertion
Indexed under
- Bonvale dam fever
- Overexertion (effects) (exhaustion)
- Effect, adverse › exertion
- Fever › Bonvale dam (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Exhaustion, exhaustive › due to › excessive exertion (physical NEC)
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