ICD-10-CM > M00-M99 > M05-M14 > M13 > M13.8 > M13.87 M13.87 Other specified arthritis, ankle and foot Non-Billable/Non-Specific Codes M13.871Other specified arthritis, right ankle and footM13.872Other specified arthritis, left ankle and footM13.879Other specified arthritis, unspecified ankle and foot