M04

Non-billable

Autoinflammatory syndromes

M04 is the ICD-10-CM code for Autoinflammatory syndromes. It is a non-billable category code — use a more specific child code such as M04.1 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Subcodes
4
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Excludes2 — not included here

  • Crohn's disease (K50.-)

Frequently asked questions

What is ICD-10 code M04?
M04 is the ICD-10-CM code for "Autoinflammatory syndromes". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M04 a billable code?
No — M04 is a non-billable header code. Use a more specific child code (such as M04.1) for billing.
What are the subcodes of M04?
M04 has 4 more specific child codes, including M04.1, M04.2, M04.8.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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