ICD-10-CM > S00-T88 > T66-T78 > T67 > T67.0 > T67.01 T67.01 Heatstroke and sunstroke Non-Billable/Non-Specific Applicable To Heat apoplexyHeat pyrexiaSiriasisThermoplegia Codes T67.01XA..., initial encounterT67.01XD..., subsequent encounterT67.01XS..., sequela