ICD-10-CM > S00-T88 > T66-T78 > T67 > T67.3 T67.3 Heat exhaustion, anhydrotic Non-Billable/Non-Specific Applicable To Heat prostration due to water depletion Type 1 Excludes heat exhaustion due to salt depletion (T67.4) Codes T67.3XXA..., initial encounterT67.3XXD..., subsequent encounterT67.3XXS..., sequela