Rheumatoid nodule, left shoulder

This code identifies a rheumatoid nodule, which is a firm, non-tender subcutaneous lump, specifically located on the left shoulder. These nodules are a common extra-articular manifestation of rheumatoid arthritis, often found over pressure points.

Apply this code when documentation clearly indicates the presence of a rheumatoid nodule on the patient's left shoulder. This diagnosis is typically made through physical examination and may be supported by imaging or biopsy results confirming the nodule's nature.

• Always confirm the specific anatomical location (left shoulder) and laterality.
• Code also the underlying rheumatoid arthritis (e.g., M05.xx or M06.xx) as the primary diagnosis, as the nodule is a manifestation of the systemic disease.
• Differentiate from other subcutaneous nodules that are not rheumatoid in origin.