ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.7 > T34.72 T34.72 Frostbite with tissue necrosis of left knee and lower leg Non-Billable/Non-Specific Codes T34.72XA..., initial encounterT34.72XD..., subsequent encounterT34.72XS..., sequela