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

This diagnosis code signifies a partial dislocation of the upper part of the shin bone (tibia) where it meets the thigh bone (femur), specifically moving outwards from the center of the body. It indicates that the knee involved is not specified as either left or right, and this is the first time the patient is being treated for this particular injury.

This code is appropriate for documenting an initial presentation of a lateral tibial subluxation when the medical record does not specify which knee is affected. It would be used in emergency department visits, initial orthopedic consultations, or when a patient first seeks treatment for this injury.

• Ensure the documentation clearly states "subluxation" rather than a full "dislocation" to differentiate from other S83.1 codes.
• Only use the "A" seventh character for the initial encounter for active treatment of the injury.
• Avoid this code if the laterality (left or right knee) is documented; instead, use the more specific S83.141A or S83.142A.