ICD-10-CM > S00-T88 > T33-T34 > T34 > T34.5 > T34.52 > T34.521 T34.521 Frostbite with tissue necrosis of right hand Non-Billable/Non-Specific Codes T34.521A..., initial encounterT34.521D..., subsequent encounterT34.521S..., sequela