AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2025 Issue 4; New/Revised ICD-10-CM Codes
Abnormal Rheumatoid Factor or Anti-citrullinated Protein Antibody with and without Rheumatoid Arthritis
Codes M05.A, Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis, and R76.81, Abnormal rheumatoid factor and anti-citrullinated protein antibody without rheumatoid arthritis, were created to capture abnormal rheumatoid factor and abnormal anti-citrullinated protein antibodies in individuals with and without rheumatoid arthritis. Abnormal RA-related immunologic tests measure rheumatoid factor (RF) and/or anti-citrullinated protein antibody (ACPA). These abnormal test findings can be predictive of the future onset of clinical rheumatoid arthritis.High levels of rheumatoid factor in the blood are typically caused by autoimmune diseases, such as rheumatoid arthritis, Sjogren’s syndrome and systemic lupus erythematosus...
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Article Overview
This article covers diagnosis coding for abnormal rheumatoid factor and anti-citrullinated protein antibody findings, including how those findings relate to rheumatoid arthritis and related autoimmune conditions. It is relevant to coders, clinicians, and data users who need to understand the scope of the new diagnosis categories and the clinical context behind them.
Why This Topic Matters
These diagnosis categories help distinguish abnormal immunologic test findings in patients with and without rheumatoid arthritis, supporting more precise documentation and data capture.
What You Will Learn
- The clinical context for abnormal rheumatoid factor and anti-citrullinated protein antibody findings
- How these immunologic test results relate broadly to rheumatoid arthritis and other autoimmune conditions
- Why the article discusses separate diagnosis categories for patients with and without rheumatoid arthritis
- The kinds of clinical information these diagnosis categories are intended to capture
Who Should Read This
- Medical coders
- Coding auditors
- Clinicians
- Clinical documentation staff
- Health information management professionals
Codes Discussed
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