Transient synovitis, unspecified site

This code represents a self-limiting inflammatory condition of a joint, characterized by joint pain and effusion, typically resolving without intervention. It is often seen in children, frequently following a viral illness or minor trauma, and is diagnosed when no specific cause for the synovitis can be identified.

Apply this code for cases of transient synovitis where the specific anatomical site affected is not documented. This is commonly used when the physician's documentation indicates "transient synovitis" without specifying the hip, knee, or other joint. Documentation should confirm the transient nature and absence of a definitive underlying etiology.

• Do not use this code if the specific joint affected is known; instead, use a more specific code from the M67.3- series (e.g., M67.32- for hip).
• Ensure documentation rules out other causes of synovitis, such as infectious or autoimmune conditions, before assigning this code.
• This code should not be used for chronic synovitis or synovitis due to a known underlying condition.