Rupture of synovium, unspecified wrist

This code signifies a non-traumatic tear or break in the synovial membrane of the wrist joint, without further specification of the exact wrist involved. This typically results in pain, swelling, and impaired joint function due to the disruption of the lubricating and protective synovial lining.

Apply this code when documentation indicates a spontaneous or atraumatic rupture of the wrist synovium, and the specific wrist (right or left) is not documented. This diagnosis is often supported by imaging findings (e.g., MRI) showing synovial disruption and clinical examination findings consistent with synovitis and rupture.

• Ensure documentation clearly states "rupture" of the synovium, not just inflammation (synovitis).
• If the laterality (right or left wrist) is specified, a more specific code from the M66.13 series should be used.
• Consider sequencing this code with an external cause code if a traumatic event is identified as the cause, though this code specifically implies non-traumatic rupture.