Other infective (teno)synovitis, unspecified knee

This code signifies inflammation of the synovial membrane and/or tendon sheath in an unspecified knee, caused by an infectious agent other than those specified in more granular codes. It represents a non-specific infectious process affecting the joint's lubricating structures.

Use this code when documentation indicates infective synovitis or tenosynovitis of the knee, but the specific infectious organism is not identified or the laterality (right or left) is not documented. This code is appropriate when the provider diagnoses an infection of the knee's synovial structures without further specificity.

• Ensure the documentation clearly states "infective" or "septic" to differentiate from non-infectious synovitis.
• Avoid using this code if the laterality (right or left knee) is specified; instead, use M65.161 or M65.162.
• Always attempt to query the provider for the specific infectious agent and laterality to allow for more precise coding.