ICD-10-CM > M00-M99 > M05-M14 > M05 > M05.4 > M05.46 M05.46 Rheumatoid myopathy with rheumatoid arthritis of knee Non-Billable/Non-Specific Codes M05.461Rheumatoid myopathy with rheumatoid arthritis of right kneeM05.462Rheumatoid myopathy with rheumatoid arthritis of left kneeM05.469Rheumatoid myopathy with rheumatoid arthritis of unspecified knee