ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.13 > S83.133 S83.133 Medial subluxation of proximal end of tibia, unspecified knee Non-Billable/Non-Specific Codes S83.133A..., initial encounterS83.133D..., subsequent encounterS83.133S..., sequela