FY2026
Effective from
- Added
Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
Billable diagnosis code
CDC/NCHS · FY2026Coverage depends on the payer, service and applicable policy. A billable code does not guarantee payment.
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2025-10-01
Latest recorded change · FY2026
Effective from
Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis
Billable diagnosis code
CDC/NCHS · FY2026| All editions | Effective from | Code history |
|---|---|---|
| FY2026 | 2025-10-01 | Added |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Disorders affecting predominantly peripheral (limb) joints
Historical assignments from the CDC conversion table support data retrieval. They do not authorize substituting a previous code for the current code.
Previous assignment: M05.9
Other entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| M05.0 | Felty's syndrome | Category · further specificity required |
| M05.1 | Rheumatoid lung disease with rheumatoid arthritis | Category · further specificity required |
| M05.2 | Rheumatoid vasculitis with rheumatoid arthritis | Category · further specificity required |
| M05.3 | Rheumatoid heart disease with rheumatoid arthritis | Category · further specificity required |
| M05.4 | Rheumatoid myopathy with rheumatoid arthritis | Category · further specificity required |
| M05.5 | Rheumatoid polyneuropathy with rheumatoid arthritis | Category · further specificity required |
| M05.6 | Rheumatoid arthritis with involvement of other organs and systems | Category · further specificity required |
| M05.7 | Rheumatoid arthritis with rheumatoid factor without organ or systems involvement | Category · further specificity required |
| M05.8 | Other rheumatoid arthritis with rheumatoid factor | Category · further specificity required |
| M05.9 | Rheumatoid arthritis with rheumatoid factor, unspecified | Billable / specific |
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