Other synovitis and tenosynovitis, other site

This code signifies inflammation of the synovial membrane (synovitis) or the tendon sheath (tenosynovitis) affecting an anatomical site not specified by more precise ICD-10-CM codes. It represents a non-specific inflammatory process impacting joints or tendons in locations other than the hand, wrist, foot, or ankle.

Apply this code when documentation clearly indicates synovitis or tenosynovitis in a location such as the shoulder, elbow, hip, or knee, and no more specific code for that site exists. It is appropriate when the provider's diagnosis explicitly states "other site" or a non-specified joint/tendon location.

• Ensure the medical record specifies a site other than those covered by more granular M65.8- codes (e.g., M65.84- for hand, M65.87- for ankle/foot).
• Avoid using this code if a more specific anatomical site or type of synovitis/tenosynovitis is documented (e.g., M65.3- for trigger finger).
• Always query the provider if the documentation is ambiguous regarding the specific anatomical site of the synovitis or tenosynovitis.