ICD-10-CM > S00-T88 > S80-S89 > S80 > S80.2 > S80.22 > S80.222 S80.222 Blister (nonthermal), left knee Non-Billable/Non-Specific Codes S80.222A..., initial encounterS80.222D..., subsequent encounterS80.222S..., sequela