ICD-10-CM > M00-M99 > M05-M14 > M12 > M12.8 > M12.86 M12.86 Other specific arthropathies, not elsewhere classified, knee Non-Billable/Non-Specific Codes M12.861Other specific arthropathies, not elsewhere classified, right kneeM12.862Other specific arthropathies, not elsewhere classified, left kneeM12.869Other specific arthropathies, not elsewhere classified, unspecified knee