Other synovitis and tenosynovitis, unspecified forearm

This code signifies inflammation of the synovial membrane (synovitis) or the tendon sheath (tenosynovitis) affecting an unspecified forearm. It represents a non-specific inflammatory process within these structures, without further detail regarding the specific tendon or joint involved.

This code is appropriate when documentation indicates synovitis or tenosynovitis of the forearm, but the laterality (right or left) is not specified. It is used when the provider's assessment points to an inflammatory condition of the forearm's synovial or tendon sheath, and a more specific anatomical site within the forearm is not documented.

• Only use this code when laterality is truly unspecified; otherwise, use a more specific code (M65.831 for right, M65.832 for left).
• Avoid using this code if the documentation specifies a particular tendon (e.g., extensor carpi radialis tenosynovitis), as more specific codes exist.
• Ensure the documentation clearly states "forearm" and "synovitis" or "tenosynovitis" to support this diagnosis.