ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.2 > M67.26 M67.26 Synovial hypertrophy, not elsewhere classified, lower leg Non-Billable/Non-Specific Codes M67.261Synovial hypertrophy, not elsewhere classified, right lower legM67.262Synovial hypertrophy, not elsewhere classified, left lower legM67.269Synovial hypertrophy, not elsewhere classified, unspecified lower leg