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