ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.12 > S83.126 S83.126 Posterior dislocation of proximal end of tibia, unspecified knee Non-Billable/Non-Specific Codes S83.126A..., initial encounterS83.126D..., subsequent encounterS83.126S..., sequela