ICD-10-CM > S00-T88 > T33-T34 > T33 > T33.7 > T33.70 T33.70 Superficial frostbite of unspecified knee and lower leg Non-Billable/Non-Specific Codes T33.70XA..., initial encounterT33.70XD..., subsequent encounterT33.70XS..., sequela