Palindromic rheumatism, unspecified ankle and foot

This code signifies a diagnosis of palindromic rheumatism affecting an unspecified ankle and/or foot. Palindromic rheumatism is a rare, episodic inflammatory arthritis characterized by recurrent, self-limiting attacks of joint pain and swelling that resolve completely between episodes. It is often considered a precursor to rheumatoid arthritis in some patients.

Use this code when documentation confirms a diagnosis of palindromic rheumatism and the affected joint is identified as an ankle or foot, but the specific laterality (right or left) or specific joint within the foot/ankle is not documented. This code is appropriate for initial encounters and subsequent follow-ups for this condition.

• Avoid using this code if a more specific anatomical site (e.g., right ankle, left foot) or laterality is documented; instead, choose the appropriate specific M12.37- subcategory.
• Ensure the documentation clearly states "palindromic rheumatism" to support this diagnosis.
• Consider co-reporting with codes for associated symptoms or complications, if present and documented.