Rheumatoid nodule, unspecified shoulder

This code signifies the presence of a rheumatoid nodule affecting an unspecified shoulder joint. A rheumatoid nodule is a firm, non-tender subcutaneous lump, a characteristic extra-articular manifestation of rheumatoid arthritis, typically found over pressure points.

Apply this code when documentation clearly identifies a rheumatoid nodule located on the shoulder, but the laterality (left or right) is not specified. This diagnosis is often made clinically, sometimes supported by imaging or biopsy, in patients with a confirmed or suspected diagnosis of rheumatoid arthritis.

• Ensure the documentation explicitly states "rheumatoid nodule" and specifies the shoulder as the affected site.
• Avoid using this code if laterality is documented; instead, select the more specific code for the left (M06.321) or right (M06.322) shoulder.
• Always code the underlying rheumatoid arthritis (e.g., M05.xx or M06.xx) as the primary diagnosis when present, with the rheumatoid nodule as a secondary diagnosis.