ICD-10-CM > M00-M99 > M05-M14 > M06 > M06.0 > M06.07 M06.07 Rheumatoid arthritis without rheumatoid factor, ankle and foot Non-Billable/Non-Specific Codes M06.071Rheumatoid arthritis without rheumatoid factor, right ankle and footM06.072Rheumatoid arthritis without rheumatoid factor, left ankle and footM06.079Rheumatoid arthritis without rheumatoid factor, unspecified ankle and foot