ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.9 T34.9 Frostbite with tissue necrosis of other and unspecified sites Non-Billable/Non-Specific Codes T34.90Frostbite with tissue necrosis of unspecified sitesT34.90XA..., initial encounterT34.90XD..., subsequent encounterT34.90XS..., sequelaT34.99Frostbite with tissue necrosis of other sitesT34.99XA..., initial encounterT34.99XD..., subsequent encounterT34.99XS..., sequela