ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.2 > M67.21 M67.21 Synovial hypertrophy, not elsewhere classified, shoulder Non-Billable/Non-Specific Codes M67.211Synovial hypertrophy, not elsewhere classified, right shoulderM67.212Synovial hypertrophy, not elsewhere classified, left shoulderM67.219Synovial hypertrophy, not elsewhere classified, unspecified shoulder