T67.3 vs T67.4
T67.3 and T67.4 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 T67.3
heat exhaustion due to salt depletion (T67.4)
T67.3
Heat exhaustion, anhydrotic
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
Use when the record says
- Heat prostration due to water depletion
Indexed under
- Heat › exhaustion › anhydrotic (effects)
- Prostration › heat › anhydrotic
- Exhaustion, exhaustive › heat › due to › water depletion (physical NEC)
- Heat › exhaustion › due to › water depletion (effects)
- Prostration › heat › due to › water depletion
T67.4
Heat exhaustion due to salt depletion
Not billable
- Chapter 19
- Injury, poisoning and certain other consequences of external causes
- Section
- T66-T78
Use when the record says
- Heat prostration due to salt (and water) depletion
Indexed under
- Depletion › salt or sodium › causing heat exhaustion or prostration
- Exhaustion, exhaustive › heat › due to › salt depletion (physical NEC)
- Heat › exhaustion › due to › saltdepletion (effects)
- Prostration › heat › due to › saltdepletion
- Heat › exhaustion › due to › water depletion › with salt depletion (effects)
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