Villonodular synovitis (pigmented), unspecified hip

This code represents pigmented villonodular synovitis (PVNS) affecting an unspecified hip joint. PVNS is a rare, benign proliferative disorder of the synovial membrane, characterized by villous and nodular growth with hemosiderin deposition, leading to joint pain, swelling, and potential joint destruction.

Use this code when documentation confirms a diagnosis of PVNS of the hip, but the laterality (left or right) is not specified. This typically occurs when the physician's notes or imaging reports clearly identify PVNS of the hip without further detail on the affected side.

• Ensure the documentation explicitly states "unspecified hip" or lacks laterality for PVNS of the hip.
• If laterality is documented (e.g., right hip, left hip), use the more specific codes M12.251 or M12.252.
• Do not use this code for other forms of synovitis; confirm the "villonodular" and "pigmented" aspects of the diagnosis.