ICD-10-CM > M00-M99 > M05-M14 > M06 > M06.8 > M06.87 M06.87 Other specified rheumatoid arthritis, ankle and foot Non-Billable/Non-Specific Codes M06.871Other specified rheumatoid arthritis, right ankle and footM06.872Other specified rheumatoid arthritis, left ankle and footM06.879Other specified rheumatoid arthritis, unspecified ankle and foot