ICD-10-CM > M00-M99 > M05-M14 > M13 > M13.1 > M13.12 M13.12 Monoarthritis, not elsewhere classified, elbow Non-Billable/Non-Specific Codes M13.121Monoarthritis, not elsewhere classified, right elbowM13.122Monoarthritis, not elsewhere classified, left elbowM13.129Monoarthritis, not elsewhere classified, unspecified elbow