ICD-10-CM > S00-T88 > S80-S89 > S80 > S80.9 > S80.91 > S80.919 S80.919 Unspecified superficial injury of unspecified knee Non-Billable/Non-Specific Codes S80.919A..., initial encounterS80.919D..., subsequent encounterS80.919S..., sequela