ICD-10-CM > S00-T88 > S30-S39 > S30 > S30.8 > S30.82 > S30.820 S30.820 Blister (nonthermal) of lower back and pelvis Non-Billable/Non-Specific Codes S30.820A..., initial encounterS30.820D..., subsequent encounterS30.820S..., sequela