ICD-10-CM > S00-T88 > T33-T34 > T33 > T33.7 T33.7 Superficial frostbite of knee and lower leg Non-Billable/Non-Specific Type 2 Excludes superficial frostbite of ankle and foot (T33.8-) Codes T33.70Superficial frostbite of unspecified knee and lower legT33.70XA..., initial encounterT33.70XD..., subsequent encounterT33.70XS..., sequelaT33.71Superficial frostbite of right knee and lower legT33.71XA..., initial encounterT33.71XD..., subsequent encounterT33.71XS..., sequelaT33.72Superficial frostbite of left knee and lower legT33.72XA..., initial encounterT33.72XD..., subsequent encounterT33.72XS..., sequela