M04 – Autoinflammatory syndromes
ICD-10-CM 2027 diagnosis code · Autoinflammatory syndromes (M04)
ICD-10-CM code
M04
- Code
M04(claims format:M04)- Description
- Autoinflammatory syndromes
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M04 Autoinflammatory syndromes (M04)
Billable codes under M04
M04 is a header code and cannot be used on claims. Choose the most specific code:
- M04.1 – Periodic fever syndromesBillable
- M04.2 – Cryopyrin-associated periodic syndromesBillable
- M04.3 – VEXAS syndromeBillable · New in 2027
- M04.8 – Other autoinflammatory syndromesBillable
- M04.9 – Autoinflammatory syndrome, unspecifiedBillable
Notes for M04
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, in the block M04 (Autoinflammatory syndromes (M04)).
Is M04 a billable code?
No. M04 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.