ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.8 > T34.82 > T34.829 T34.829 Frostbite with tissue necrosis of unspecified foot Non-Billable/Non-Specific Codes T34.829A..., initial encounterT34.829D..., subsequent encounterT34.829S..., sequela