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M23.40

Billable

Loose body in knee, unspecified knee

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A small piece of bone, cartilage, or other tissue that has broken loose and is floating inside the knee joint, affecting an unspecified knee.

Coding Tips

  • •Specify laterality when documented; use M23.41 (right) or M23.42 (left) if knee side is identified
  • •Document whether the loose body is causing mechanical symptoms like locking or catching

Code Hierarchy

└M23Internal derangement of knee└M23.4Loose body in knee└M23.40Loose body in knee, unspecified knee
└M23.40Loose body in knee, unspecified knee

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