ICD-10-CM > S00-T88 > T66-T78 > T73 > T73.3 T73.3 Exhaustion due to excessive exertion Non-Billable/Non-Specific Applicable To Exhaustion due to overexertion Codes T73.3XXA..., initial encounterT73.3XXD..., subsequent encounterT73.3XXS..., sequela