Intermittent hydrarthrosis, other site

This code describes a condition characterized by recurrent, episodic swelling of a joint due to an accumulation of synovial fluid, without an identifiable underlying cause such as trauma or infection. The "other site" designation indicates that the hydrarthrosis affects a joint not specifically categorized elsewhere.

Apply this code when documentation clearly indicates intermittent, non-inflammatory joint effusions in a joint other than the knee, hip, shoulder, or ankle/foot. This diagnosis is typically made after ruling out other causes of joint swelling. Supporting documentation should detail the episodic nature of the swelling and the affected joint.

• Ensure the documentation specifies "intermittent" or "recurrent" to differentiate from acute or chronic effusions.
• Verify that the affected joint is not one with a more specific code for intermittent hydrarthrosis (e.g., knee, ankle).
• Always look for and code any associated underlying conditions or causes if identified, as this code represents an idiopathic presentation.