Anterior sublux of proximal end of tibia, right knee, init

This code describes an incomplete dislocation of the right tibia at the knee joint, where the tibia has shifted forward relative to the femur. It indicates that the articular surfaces are still partially in contact, but their alignment is disrupted. This is an acute injury, not a chronic or recurrent condition.

Use this code for initial encounters with patients presenting with a newly diagnosed anterior subluxation of the proximal tibia in the right knee. This typically occurs following trauma, such as a sports injury or fall, causing ligamentous damage. It should be applied when the patient is receiving active treatment for the injury.

• Ensure documentation specifies "anterior" subluxation and the "right" knee.
• Verify this is the "initial encounter" for active treatment of the injury. Subsequent care would use a different seventh character.
• Code any associated ligamentous tears (e.g., ACL, PCL) separately, as they are often the underlying cause.