M06.3: Rheumatoid nodule

Rheumatoid nodules, classified under the ICD-10 code M06.3, are a prominent feature of Rheumatoid Arthritis (RA), a chronic autoimmune disorder. These nodules are firm, round bumps that are commonly found under the skin near alluding joints, such as the elbows, fingers, or knuckles. They vary in size and can range from being as small as a pea to as large as a walnut. While these nodules are generally painless, they can cause discomfort depending upon their location and size. The exact cause of rheumatoid nodules is not clear, though they are often associated with severe cases of RA and are more likely to occur in individuals who test positive for rheumatoid factor – an antibody found in the blood of most people with RA. Symptoms include the visible swelling of nodules and potential difficulty moving or using affected parts of the body.

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