Anterior 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) forward in relation to the thigh bone (femur), affecting an unspecified knee. It indicates that the patient is receiving initial active treatment for this specific injury.

Use this code for new injuries where the proximal tibia has partially slipped forward at the knee joint, and the medical record does not specify which knee is affected. This is appropriate for the first visit or encounter for treatment of this subluxation.

• Ensure documentation clearly states "anterior subluxation" of the proximal tibia.
• Only use this code when the laterality (left or right knee) is not documented.
• Append additional characters for subsequent encounters or sequelae as appropriate.