M05.A – Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies
- Code
M05.A(claims format:M05A)- Description
- Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
- Short description
- Abn rheu fctr & anti-citrul protein antibody w rheu arthrit
- 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
- M05-M14 Inflammatory polyarthropathies
- Parent codes
- M05
Notes for M05.A
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M05 – Rheumatoid arthritis with rheumatoid factor
Index terms for M05.A
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in M05
- M05.0 – Felty's syndromeHeader
- M05.1 – Rheumatoid lung disease with rheumatoid arthritisHeader
- M05.2 – Rheumatoid vasculitis with rheumatoid arthritisHeader
- M05.3 – Rheumatoid heart disease with rheumatoid arthritisHeader
- M05.4 – Rheumatoid myopathy with rheumatoid arthritisHeader
- M05.5 – Rheumatoid polyneuropathy with rheumatoid arthritisHeader
- M05.6 – Rheumatoid arthritis with involvement of other organs and systemsHeader
- M05.7 – Rheumatoid arthritis with rheumatoid factor without organ or systems involvementHeader
- M05.8 – Other rheumatoid arthritis with rheumatoid factorHeader
- M05.9 – Rheumatoid arthritis with rheumatoid factor, unspecifiedBillable
Frequently asked questions
What is ICD-10 code M05.A?
M05.A is the ICD-10-CM code for abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis, in the block M05-M14 (Inflammatory polyarthropathies).
Is M05.A a billable code?
Yes. M05.A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M05.A belong to?
It belongs to category M05 – Rheumatoid arthritis with rheumatoid factor.
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.