Prepatellar bursitis, unspecified knee

This code signifies inflammation of the prepatellar bursa, a fluid-filled sac located in front of the kneecap, without specifying which knee is affected. This condition often results in pain, swelling, and tenderness over the patella. It is commonly known as "housemaid's knee" due to its association with repetitive kneeling.

Apply this code when documentation indicates a diagnosis of prepatellar bursitis but does not specify laterality (left or right knee). This is appropriate for initial encounters where laterality is not yet determined or when the medical record explicitly states "unspecified knee." Supporting documentation includes physician notes detailing symptoms like localized pain, swelling, and tenderness over the patella.

• Only use this code when laterality is truly unspecified; otherwise, use the more specific codes for left (M70.42) or right (M70.41) prepatellar bursitis.
• Ensure the documentation clearly states "prepatellar bursitis" and not another type of bursitis around the knee (e.g., infrapatellar bursitis).
• Consider any underlying causes or associated conditions that may also require coding, such as repetitive trauma or infection, if documented.