ICD-10-CM > M00-M99 > M05-M14 > M05 > M05.0 > M05.06 M05.06 Felty's syndrome, knee Non-Billable/Non-Specific Codes M05.061Felty's syndrome, right kneeM05.062Felty's syndrome, left kneeM05.069Felty's syndrome, unspecified knee