ICD Code M23.91

ICD code M23.91 is unspecified internal derangement of the right knee.

1. Patient presents with knee pain localized to the right knee

2. Clinical evaluation reveals mechanical symptoms such as locking, catching, or giving way of the right knee

3. Physical examination identifies joint line tenderness, swelling, or decreased range of motion in the right knee

4. Imaging studies (e.g., MRI, X-ray) are inconclusive or do not specify the exact nature of the internal derangement

5. No definitive diagnosis of a specific internal knee pathology (e.g., meniscal tear, ligament injury) can be established

6. Symptoms are not attributable to external trauma or extra-articular causes

7. The internal derangement is not further classified or specified after diagnostic workup

Relevant CPT codes that may be used to treat ICD code M23.91 include:

- 29881: Arthroscopy, knee, surgical; with meniscectomy (medial OR lateral, including any meniscal shaving)

- 29880: Arthroscopy, knee, surgical; with meniscectomy (medial AND lateral, including any meniscal shaving)

- 29877: Arthroscopy, knee, surgical; debridement/shaving of articular cartilage

- 29875: Arthroscopy, knee, diagnostic, with or without synovial biopsy

- 27332: Removal of loose body or foreign body, knee

- 27447: Arthroplasty, knee, condyle and plateau; medial AND lateral compartments with or without patella resurfacing (total knee arthroplasty)

- 27446: Arthroplasty, knee, condyle and plateau; medial OR lateral compartment

These CPT codes should be selected based on the specific clinical scenario and procedures performed for M23.91.

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