ICD-10-CM > M00-M99 > M65-M67 > M66 > M66.1 > M66.12 M66.12 Rupture of synovium, elbow Non-Billable/Non-Specific Codes M66.121Rupture of synovium, right elbowM66.122Rupture of synovium, left elbowM66.129Rupture of synovium, unspecified elbow