ICD-10-CM > M00-M99 > M04-M04 > M04 M04 Autoinflammatory syndromes Non-Billable/Non-Specific Type 2 Excludes Crohn's disease (K50.-) Codes M04.1Periodic fever syndromesM04.2Cryopyrin-associated periodic syndromesM04.8Other autoinflammatory syndromesM04.9Autoinflammatory syndrome, unspecified