Is M04.9 a billable ICD-10 code?

Yes. M04.9 (Autoinflammatory syndrome, unspecified) is billable and can be used for insurance claims. Always verify payer-specific requirements.

M04.9 ✓ Billable

Autoinflammatory syndrome, unspecified

Q: What is ICD-10 code M04.9?

ICD-10-CM code M04.9 stands for "Autoinflammatory syndrome, unspecified". It is a billable code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue

Code

M04.9

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Diseases of the Musculoskeletal System and Connective Tissue

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code M04.9?

ICD-10-CM code M04.9 represents Autoinflammatory syndrome, unspecified. It is a billable diagnosis code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.

Is M04.9 billable?

Yes. M04.9 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is M04.9 in?

M04.9 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.

Related codes in the M04 category

M04 Autoinflammatory syndromes Non-billable M04.1 Periodic fever syndromes Billable M04.2 Cryopyrin-associated periodic syndromes Billable M04.8 Other autoinflammatory syndromes Billable

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