ICD-10-CM > S00-T88 > S80-S89 > S80 > S80.9 > S80.91 S80.91 Unspecified superficial injury of knee Non-Billable/Non-Specific Codes S80.911Unspecified superficial injury of right kneeS80.911A..., initial encounterS80.911D..., subsequent encounterS80.911S..., sequelaS80.912Unspecified superficial injury of left kneeS80.912A..., initial encounterS80.912D..., subsequent encounterS80.912S..., sequelaS80.919Unspecified superficial injury of unspecified kneeS80.919A..., initial encounterS80.919D..., subsequent encounterS80.919S..., sequela