ICD-10-CM > M00-M99 > M65-M67 > M67 > M67.8 > M67.86 M67.86 Other specified disorders of synovium and tendon, knee Non-Billable/Non-Specific Codes M67.861Other specified disorders of synovium, right kneeM67.862Other specified disorders of synovium, left kneeM67.863Other specified disorders of tendon, right kneeM67.864Other specified disorders of tendon, left kneeM67.869Other specified disorders of synovium and tendon, unspecified knee