ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.1 > S83.12 > S83.122 S83.122 Posterior subluxation of proximal end of tibia, left knee Non-Billable/Non-Specific Codes S83.122A..., initial encounterS83.122D..., subsequent encounterS83.122S..., sequela