ICD-10-CM > M00-M99 > M05-M14 > M05 > M05.0 > M05.07 M05.07 Felty's syndrome, ankle and foot Non-Billable/Non-Specific Applicable To Felty's syndrome, tarsus, metatarsus and phalanges Codes M05.071Felty's syndrome, right ankle and footM05.072Felty's syndrome, left ankle and footM05.079Felty's syndrome, unspecified ankle and foot