ICD-10-CM > M00-M99 > M05-M14 > M05 > M05.4 > M05.42 M05.42 Rheumatoid myopathy with rheumatoid arthritis of elbow Non-Billable/Non-Specific Codes M05.421Rheumatoid myopathy with rheumatoid arthritis of right elbowM05.422Rheumatoid myopathy with rheumatoid arthritis of left elbowM05.429Rheumatoid myopathy with rheumatoid arthritis of unspecified elbow