ICD-10-CM > M00-M99 > M05-M14 > M12 > M12.3 > M12.37 M12.37 Palindromic rheumatism, ankle and foot Non-Billable/Non-Specific Codes M12.371Palindromic rheumatism, right ankle and footM12.372Palindromic rheumatism, left ankle and footM12.379Palindromic rheumatism, unspecified ankle and foot