Posterior sublux of proximal end of tibia, unsp knee, init

This code signifies a partial dislocation of the upper part of the shin bone (tibia) backward, relative to the thigh bone (femur), within the knee joint. It indicates that the knee involved is not specified as left or right, and this is the first time the patient is receiving care for this specific injury.

Use this code for a patient presenting with a newly diagnosed posterior subluxation of the proximal tibia where the laterality of the knee is not documented. This would typically be seen in emergency department visits or initial orthopedic consultations following an acute injury.

• Ensure documentation clearly states "subluxation" and "posterior" to differentiate from dislocation or other types of instability.
• Only use the "A" seventh character for the initial encounter for active treatment of the injury.
• If the laterality (left or right knee) is specified in the medical record, a more specific code should be chosen.