ICD-10-CM > M00-M99 > M05-M14 > M06 > M06.2 > M06.26 M06.26 Rheumatoid bursitis, knee Non-Billable/Non-Specific Codes M06.261Rheumatoid bursitis, right kneeM06.262Rheumatoid bursitis, left kneeM06.269Rheumatoid bursitis, unspecified knee