Transient synovitis, left ankle and foot

This code signifies a temporary, non-infectious inflammation of the synovial membrane within the left ankle and foot joint. It is characterized by joint pain and swelling, often resolving spontaneously without long-term sequelae. This condition is typically self-limiting and not associated with systemic disease.

Apply this code when documentation explicitly states a diagnosis of transient synovitis affecting the left ankle or foot. This diagnosis is often made after ruling out other causes of joint pain, such as infection, trauma, or chronic inflammatory conditions. Supporting documentation should include clinical findings consistent with acute, self-resolving joint inflammation.

• Ensure the documentation specifies "transient" to differentiate from other forms of synovitis.
• Verify laterality; this code is specific to the left ankle and foot.
• Do not use for chronic synovitis or synovitis due to a known underlying systemic condition.