Cryopyrin-associated periodic syndromes

This code represents a group of rare, inherited autoinflammatory disorders characterized by recurrent episodes of fever, rash, joint pain, and other systemic inflammation. These syndromes, including Familial Cold Autoinflammatory Syndrome (FCAS), Muckle-Wells Syndrome (MWS), and Chronic Infantile Neurological Cutaneous Articular (CINCA) syndrome (also known as Neonatal-Onset Multisystem Inflammatory Disease [NOMID]), are caused by mutations in the NLRP3 gene, leading to overproduction of interleukin-1 beta.

Assign this code for patients diagnosed with any of the cryopyrin-associated periodic syndromes. Documentation should clearly state the specific syndrome (e.g., Muckle-Wells Syndrome) or a general diagnosis of CAPS. This code is appropriate when genetic testing confirms an NLRP3 mutation or when clinical criteria for one of the CAPS are met.

• Ensure documentation specifies the type of cryopyrin-associated periodic syndrome if known, though this code encompasses all of them.
• Do not confuse with other periodic fever syndromes not linked to cryopyrin, such as Familial Mediterranean Fever (E85.0).
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, especially for management of the underlying condition.