ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.0 > T34.09 T34.09 Frostbite with tissue necrosis of other part of head Non-Billable/Non-Specific Codes T34.09XA..., initial encounterT34.09XD..., subsequent encounterT34.09XS..., sequela