Villonodular synovitis (pigmented), unspecified wrist

This code describes an unspecified form of pigmented villonodular synovitis (PVNS) affecting the wrist. PVNS is a rare, benign proliferative disorder of the synovial membrane, characterized by villous and nodular growths that can lead to joint pain, swelling, and restricted movement due to hemosiderin deposition.

Use this code when documentation confirms a diagnosis of villonodular synovitis of the wrist, but the specific type (e.g., localized, diffuse) is not specified. This code is appropriate when the provider explicitly states "villonodular synovitis, wrist" without further detail regarding laterality or specific wrist joint involvement.

• Ensure the documentation clearly specifies the wrist as the affected joint.
• If laterality (right or left) is documented, use the more specific codes M12.231 or M12.232.
• Do not confuse with other forms of synovitis or tenosynovitis; PVNS has distinct pathological features.