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M04 Autoinflammatory syndromes

ICD-10-CM category M04 sits in Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99). It contains 5 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.

Billable codes in M04

CodeDescription
M04.1Periodic fever syndromes
M04.2Cryopyrin-associated periodic syndromes
M04.3VEXAS syndrome
M04.8Other autoinflammatory syndromes
M04.9Autoinflammatory syndrome, unspecified

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