Unspecified synovitis and tenosynovitis, left ankle and foot

This code signifies inflammation of the synovial membrane (synovitis) or the tendon sheath (tenosynovitis) affecting the left ankle and/or foot. The specific cause or type of inflammation is not documented.

Apply this code when documentation indicates synovitis or tenosynovitis of the left ankle/foot without further specification of the etiology or anatomical site (e.g., specific tendon). This is appropriate when the provider has not identified the underlying cause or a more precise diagnosis.

• Avoid using this code if a more specific diagnosis (e.g., infectious, crystal-induced, or specific tendon involvement) is documented.
• Always review the medical record for laterality and anatomical specificity.
• Consider codes from the M77 category (Other enthesopathies) if the inflammation is at the tendon insertion site rather than the sheath or joint lining.