ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.7 > T34.71 T34.71 Frostbite with tissue necrosis of right knee and lower leg Non-Billable/Non-Specific Codes T34.71XA..., initial encounterT34.71XD..., subsequent encounterT34.71XS..., sequela