M04: Autoinflammatory syndromes
Codes under M04 (Autoinflammatory syndromes). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| M04.1 | Periodic fever syndromes | ✓ |
| M04.1 | Periodic fever syndromes | ✓ |
| M04.2 | Cryopyrin-associated periodic syndromes | ✓ |
| M04.2 | Cryopyrin-associated periodic syndromes | ✓ |
| M04.3 | VEXAS syndrome | ✓ |
| M04.8 | Other autoinflammatory syndromes | ✓ |
| M04.8 | Other autoinflammatory syndromes | ✓ |
| M04.9 | Autoinflammatory syndrome, unspecified | ✓ |
| M04.9 | Autoinflammatory syndrome, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code M04?
M04 is an ICD-10-CM category covering Autoinflammatory syndromes. It contains 9 more specific diagnosis codes, 9 of which are billable.
Is M04 a billable code?
No — M04 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M04.1 — Periodic fever syndromes). 9 of the 9 codes under M04 are billable.
What codes fall under M04?
M04 includes M04.1, M04.1, M04.2, M04.2, M04.3, plus 4 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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