ICD-10-CM > S00-T88 > S50-S59 > S50 > S50.8 > S50.82 S50.82 Blister (nonthermal) of forearm Non-Billable/Non-Specific Codes S50.821Blister (nonthermal) of right forearmS50.821A..., initial encounterS50.821D..., subsequent encounterS50.821S..., sequelaS50.822Blister (nonthermal) of left forearmS50.822A..., initial encounterS50.822D..., subsequent encounterS50.822S..., sequelaS50.829Blister (nonthermal) of unspecified forearmS50.829A..., initial encounterS50.829D..., subsequent encounterS50.829S..., sequela