M04.9Billable

Autoinflammatory syndrome, unspecified

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

Related codes in category M04

M04Autoinflammatory syndromesM04.1Periodic fever syndromesYesM04.2Cryopyrin-associated periodic syndromesYesM04.3VEXAS syndromeYesM04.8Other autoinflammatory syndromesYes

Frequently asked questions

What is ICD-10 code M04.9?

M04.9 is an ICD-10-CM diagnosis code for Autoinflammatory syndrome, unspecified.

Is M04.9 a billable code?

Yes. M04.9 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is M04.9 in?

M04.9 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.

When did M04.9 become effective?

M04.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to M04.9?

M04.9 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.