ICD-10-CM > S00-T88 > S80-S89 > S80 > S80.2 > S80.24 S80.24 External constriction of knee Non-Billable/Non-Specific Codes S80.241External constriction, right kneeS80.241A..., initial encounterS80.241D..., subsequent encounterS80.241S..., sequelaS80.242External constriction, left kneeS80.242A..., initial encounterS80.242D..., subsequent encounterS80.242S..., sequelaS80.249External constriction, unspecified kneeS80.249A..., initial encounterS80.249D..., subsequent encounterS80.249S..., sequela