ICD-10-CM > M00-M99 > M05-M14 > M12 > M12.2 > M12.21 M12.21 Villonodular synovitis (pigmented), shoulder Non-Billable/Non-Specific Codes M12.211Villonodular synovitis (pigmented), right shoulderM12.212Villonodular synovitis (pigmented), left shoulderM12.219Villonodular synovitis (pigmented), unspecified shoulder