ICD-10-CM > S00-T88 > T33-T34 > T33 > T33.8 > T33.81 T33.81 Superficial frostbite of ankle Non-Billable/Non-Specific Codes T33.811Superficial frostbite of right ankleT33.811A..., initial encounterT33.811D..., subsequent encounterT33.811S..., sequelaT33.812Superficial frostbite of left ankleT33.812A..., initial encounterT33.812D..., subsequent encounterT33.812S..., sequelaT33.819Superficial frostbite of unspecified ankleT33.819A..., initial encounterT33.819D..., subsequent encounterT33.819S..., sequela