M04Header code — not billable

Autoinflammatory syndromes

Chapter
13. Diseases of the musculoskeletal system and connective tissue
Category
M04
Effective date
October 1, 2026

Related codes in category M04

M04.1Periodic fever syndromesYesM04.2Cryopyrin-associated periodic syndromesYesM04.3VEXAS syndromeYesM04.8Other autoinflammatory syndromesYesM04.9Autoinflammatory syndrome, unspecifiedYes

Frequently asked questions

What is ICD-10 code M04?

M04 is an ICD-10-CM diagnosis code for Autoinflammatory syndromes.

Is M04 a billable code?

No. M04 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is M04 in?

M04 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.

When did M04 become effective?

M04 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to M04?

M04 belongs to category M04, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.