ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.13 > S83.131 S83.131 Medial subluxation of proximal end of tibia, right knee Non-Billable/Non-Specific Codes S83.131A..., initial encounterS83.131D..., subsequent encounterS83.131S..., sequela