ICD-10-CM > S00-T88 > S20-S29 > S21 > S21.0 > S21.00 > S21.009 S21.009 Unspecified open wound of unspecified breast Non-Billable/Non-Specific Codes S21.009A..., initial encounterS21.009D..., subsequent encounterS21.009S..., sequela