Rheumatoid nodule, unspecified elbow

This code signifies the presence of a rheumatoid nodule, a firm, non-tender subcutaneous lump, specifically located on an unspecified elbow. These nodules are a common extra-articular manifestation of rheumatoid arthritis, indicating chronic inflammatory disease activity.

Use this code when documentation confirms a rheumatoid nodule on the elbow, but the specific laterality (right or left) is not specified. This code is appropriate when the provider's notes clearly identify the lesion as a rheumatoid nodule and its location on the elbow.

• Avoid using this code if the laterality of the elbow is documented; instead, choose the more specific M06.321 (right) or M06.322 (left).
• Always code the underlying rheumatoid arthritis (e.g., M05.- or M06.0-) as the primary diagnosis, with the rheumatoid nodule as a secondary diagnosis.
• Ensure documentation differentiates a rheumatoid nodule from other elbow masses, such as olecranon bursitis or gouty tophi.