ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.5 > T34.53 > T34.539 T34.539 Frostbite with tissue necrosis of unspecified finger(s) Non-Billable/Non-Specific Codes T34.539A..., initial encounterT34.539D..., subsequent encounterT34.539S..., sequela