Periodic fever syndromes

This code represents a group of rare, inherited inflammatory disorders characterized by recurrent episodes of fever and systemic inflammation without an identifiable infectious cause. These syndromes often involve specific genetic mutations leading to dysregulation of the innate immune system.

Assign this code when documentation clearly indicates a diagnosis of a periodic fever syndrome, such as Familial Mediterranean Fever (FMF), Hyperimmunoglobulin D Syndrome (HIDS), or TNF Receptor-Associated Periodic Syndrome (TRAPS). Supporting documentation should include genetic testing results, clinical presentation matching diagnostic criteria, or a confirmed specialist diagnosis.

• Always seek specific documentation of the type of periodic fever syndrome if available, as more specific codes (e.g., M04.11-M04.18) exist.
• Do not use this code for fevers of unknown origin (R50.9) or other non-specific fever diagnoses without evidence of a periodic fever syndrome.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when managing complications or associated conditions.