ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.12 S83.12 Posterior subluxation and dislocation of proximal end of tibia Non-Billable/Non-Specific Applicable To Anterior dislocation of distal end of femur Codes S83.121Posterior subluxation of proximal end of tibia, right kneeS83.121A..., initial encounterS83.121D..., subsequent encounterS83.121S..., sequelaS83.122Posterior subluxation of proximal end of tibia, left kneeS83.122A..., initial encounterS83.122D..., subsequent encounterS83.122S..., sequelaS83.123Posterior subluxation of proximal end of tibia, unspecified kneeS83.123A..., initial encounterS83.123D..., subsequent encounterS83.123S..., sequelaS83.124Posterior dislocation of proximal end of tibia, right kneeS83.124A..., initial encounterS83.124D..., subsequent encounterS83.124S..., sequelaS83.125Posterior dislocation of proximal end of tibia, left kneeS83.125A..., initial encounterS83.125D..., subsequent encounterS83.125S..., sequelaS83.126Posterior dislocation of proximal end of tibia, unspecified kneeS83.126A..., initial encounterS83.126D..., subsequent encounterS83.126S..., sequela