Chondromalacia patellae, left knee

This code signifies a softening and breakdown of the cartilage on the undersurface of the kneecap (patella) specifically affecting the left knee. This degeneration can lead to pain, swelling, and a grinding sensation during knee movement. It is a common cause of anterior knee pain.

Use this code when documentation clearly indicates chondromalacia of the left patella. This diagnosis is typically supported by physical examination findings such as patellar crepitus and tenderness, and sometimes by imaging studies like MRI showing cartilage changes. It applies to patients experiencing symptoms related to this specific condition in their left knee.

• Ensure the laterality (left knee) is explicitly documented; do not assume.
• Distinguish from other patellar disorders, such as patellofemoral pain syndrome without documented cartilage softening.
• Consider co-occurring conditions like osteoarthritis of the knee, which would require additional coding.