ICD-10-CM > M00-M99 > M05-M14 > M06 > M06.8 > M06.86 M06.86 Other specified rheumatoid arthritis, knee Non-Billable/Non-Specific Codes M06.861Other specified rheumatoid arthritis, right kneeM06.862Other specified rheumatoid arthritis, left kneeM06.869Other specified rheumatoid arthritis, unspecified knee