Villonodular synovitis (pigmented), unspecified elbow

This code describes pigmented villonodular synovitis (PVNS) affecting an unspecified elbow. PVNS is a rare, benign, proliferative disorder of the synovial membrane, characterized by villous and nodular growth, hemosiderin deposition, and often causing joint pain, swelling, and limited range of motion.

Use this code when documentation confirms a diagnosis of pigmented villonodular synovitis specifically located in the elbow, but the laterality (right or left) is not specified. This code is appropriate when the provider's notes clearly state "villonodular synovitis of the elbow" without further detail on the affected side.

• Avoid using this code if the laterality of the affected elbow is documented; instead, select the more specific code for right (M12.221) or left (M12.222) elbow.
• Ensure the documentation explicitly states "pigmented villonodular synovitis" or "PVNS" to differentiate from other forms of synovitis.
• Code any associated symptoms (e.g., pain, swelling, effusion) separately if they meet reporting criteria.