Patellar tendinitis, unspecified knee

This code represents inflammation or degeneration of the patellar tendon, often referred to as "jumper's knee," without specifying which knee is affected. It typically presents as pain below the kneecap, especially during activities involving jumping, running, or squatting.

Use this code when documentation confirms a diagnosis of patellar tendinitis but does not specify laterality (left or right knee). This is appropriate for initial encounters where laterality is not yet determined or if the documentation simply states "patellar tendinitis" without further detail.

• Avoid using this code if laterality is documented; instead, choose M76.51 (right knee) or M76.52 (left knee).
• Ensure the documentation clearly indicates inflammation or degeneration of the patellar tendon.
• Do not confuse with quadriceps tendinitis (M76.1-) or other knee pain codes (M25.56-).