ICD-10 Code M06.0A – Rheumatoid arthritis without rheumatoid factor, other specified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M06.0A – Rheumatoid arthritis without rheumatoid factor, other specified site
What it is
This code identifies rheumatoid arthritis affecting a specified joint or site, when rheumatoid factor is not present. Use it for documented rheumatoid arthritis that is not classified elsewhere and is tied to another specified location.
Clinical signs
Typical findings include chronic inflammatory joint pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for the affected site and evidence that rheumatoid factor is negative or absent.
When to use this code
Use this code when the provider documents rheumatoid arthritis without rheumatoid factor and names a specific site that is not covered by a more specific category. Apply it only when the record clearly supports rheumatoid arthritis at that location. If the site or serologic status is unclear, check documentation before assigning the code.
Do not use for
Do not use it for rheumatoid arthritis with positive rheumatoid factor, or when the condition is better described by another rheumatoid arthritis code. Do not assign it if the affected site is not specified.
Coding tip
Verify both the serology status and the exact joint or site in the provider note before coding.