ICD-10-CM > S00-T88 > T33-T34 > T33 > T33.9 T33.9 Superficial frostbite of other and unspecified sites Non-Billable/Non-Specific Codes T33.90Superficial frostbite of unspecified sitesT33.90XA..., initial encounterT33.90XD..., subsequent encounterT33.90XS..., sequelaT33.99Superficial frostbite of other sitesT33.99XA..., initial encounterT33.99XD..., subsequent encounterT33.99XS..., sequela