Rheumatoid nodule, unspecified ankle and foot

This code describes the presence of a rheumatoid nodule, which is a firm, non-tender subcutaneous lump, specifically located on an unspecified ankle or foot. These nodules are a common extra-articular manifestation of rheumatoid arthritis, often appearing over pressure points.

Use this code when documentation clearly identifies a rheumatoid nodule on either the ankle or foot, but the specific laterality (right or left) is not documented. This code is appropriate when the provider's assessment confirms the nodule's presence and its association with rheumatoid arthritis.

• Do not use this code if the laterality (right or left) of the affected ankle or foot is specified; instead, use the more specific codes M06.371, M06.372, or M06.373.
• Always code the underlying rheumatoid arthritis first, as the nodule is a manifestation of the systemic disease.
• Ensure documentation differentiates rheumatoid nodules from other types of foot or ankle nodules, such as gouty tophi or ganglion cysts.