ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.8 > T34.81 T34.81 Frostbite with tissue necrosis of ankle Non-Billable/Non-Specific Codes T34.811Frostbite with tissue necrosis of right ankleT34.811A..., initial encounterT34.811D..., subsequent encounterT34.811S..., sequelaT34.812Frostbite with tissue necrosis of left ankleT34.812A..., initial encounterT34.812D..., subsequent encounterT34.812S..., sequelaT34.819Frostbite with tissue necrosis of unspecified ankleT34.819A..., initial encounterT34.819D..., subsequent encounterT34.819S..., sequela