Derang of unsp lat mensc due to old tear/inj, right knee

This code signifies a chronic internal derangement of the right knee's lateral meniscus, specifically due to a prior tear or injury. It indicates a persistent issue affecting the normal function and stability of the lateral meniscal cartilage, without further specification of the tear type.

Use this code when documentation specifies a derangement of the right lateral meniscus attributed to an old or pre-existing tear or injury. This is appropriate for patients presenting with chronic symptoms such as pain, clicking, or instability, where imaging or arthroscopy confirms a chronic meniscal derangement from a past event.

• Ensure documentation clearly states "old tear" or "old injury" to differentiate from acute meniscal tears.
• Specificity regarding the type of meniscal tear (e.g., bucket-handle, radial) is not captured by this code; use more specific codes when available.
• Always confirm laterality (right knee) to avoid coding errors.