ICD-10-CM > S00-T88 > S30-S39 > S31 > S31.8 > S31.80 > S31.809 S31.809 Unspecified open wound of unspecified buttock Non-Billable/Non-Specific Codes S31.809A..., initial encounterS31.809D..., subsequent encounterS31.809S..., sequela