ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.12 > S83.125 S83.125 Posterior dislocation of proximal end of tibia, left knee Non-Billable/Non-Specific Codes S83.125A..., initial encounterS83.125D..., subsequent encounterS83.125S..., sequela