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Chapter 13
Autoinflammatory syndromes
M04
Autoinflammatory syndromes
Codes in this block
5 codes
Billable
usable code
Non-billable
header / grouping code
Risk-adjusting
M04
Autoinflammatory syndromes
Non-billable
M04.1
Periodic fever syndromes
Billable
M04.2
Cryopyrin-associated periodic syndromes
Billable
M04.8
Other autoinflammatory syndromes
Billable
M04.9
Autoinflammatory syndrome, unspecified
Billable
Official Guidelines for M04
FY 2026 ›
I.C.13
Chapter-specific guidance
Chapter 13: Diseases of the Musculoskeletal System and Connective
Subsections
I.C.13.a
Site and laterality
I.C.13.b
Acute traumatic versus chronic or recurrent musculoskeletal conditions
I.C.13.c
Coding of Pathologic Fractures
I.C.13.d
Osteoporosis
I.C.13.e
Multisystem Inflammatory Syndrome