ICD-10-CM > S00-T88 > S00-S09 > S01 > S01.3 > S01.30 > S01.309 S01.309 Unspecified open wound of unspecified ear Non-Billable/Non-Specific Codes S01.309A..., initial encounterS01.309D..., subsequent encounterS01.309S..., sequela