ICD-10-CM > S00-T88 > S80-S89 > S81 > S81.0 > S81.00 S81.00 Unspecified open wound of knee Non-Billable/Non-Specific Codes S81.001Unspecified open wound, right kneeS81.001A..., initial encounterS81.001D..., subsequent encounterS81.001S..., sequelaS81.002Unspecified open wound, left kneeS81.002A..., initial encounterS81.002D..., subsequent encounterS81.002S..., sequelaS81.009Unspecified open wound, unspecified kneeS81.009A..., initial encounterS81.009D..., subsequent encounterS81.009S..., sequela