Calcium deposit in bursa, unspecified knee

This code signifies the presence of calcium deposits within the bursa surrounding an unspecified knee joint. This condition, often referred to as calcific bursitis, results from the accumulation of calcium salts, typically hydroxyapatite, within the synovial fluid or walls of the bursa, leading to inflammation and pain.

Use this code when documentation confirms calcification within a bursa of the knee, but the specific bursa (e.g., prepatellar, infrapatellar) is not identified. This diagnosis is often supported by imaging studies such as X-rays, ultrasound, or MRI, which visualize the calcium deposits.

• Ensure documentation explicitly states "calcium deposit" or "calcification" within a bursa of the knee.
• If the specific bursa is identified (e.g., prepatellar, anserine), use a more specific code from the M71.46- subcategory.
• Do not confuse with calcification of tendons (M65.2-), which involves a different anatomical structure.