Villonodular synovitis (pigmented), right ankle and foot

This code signifies pigmented villonodular synovitis (PVNS) affecting the right ankle and foot. PVNS is a rare, benign proliferative disorder of the synovium, characterized by villous and nodular growth with hemosiderin deposition, leading to joint swelling, pain, and potential joint destruction.

Use this code for patients diagnosed with PVNS specifically located in the right ankle or foot. Documentation should clearly state the diagnosis of pigmented villonodular synovitis and specify the affected joint as the right ankle or foot, often confirmed by imaging (MRI) and/or biopsy.

• Ensure laterality is accurately documented and coded; this code is specific to the right side.
• Distinguish from other forms of synovitis or arthropathy; PVNS has distinct pathological features.
• Confirm the diagnosis with pathology reports if a biopsy was performed, as clinical presentation can sometimes mimic other conditions.