M04.9 – Autoinflammatory syndrome, unspecified
ICD-10-CM 2027 diagnosis code · Autoinflammatory syndromes (M04)
ICD-10-CM code
M04.9
- Code
M04.9(claims format:M049)- Description
- Autoinflammatory syndrome, unspecified
- Billable
- Yes – valid for HIPAA-covered transactions
- 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)
- Parent codes
- M04
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M04 – Autoinflammatory syndromes
Excludes2 (not included here):
- Crohn's disease (K50.-)
Index terms for M04.9
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in M04
Frequently asked questions
What is ICD-10 code M04.9?
M04.9 is the ICD-10-CM code for autoinflammatory syndrome, unspecified, in the block M04 (Autoinflammatory syndromes (M04)).
Is M04.9 a billable code?
Yes. M04.9 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M04.9 belong to?
It belongs to category M04 – Autoinflammatory syndromes.
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.