Palindromic rheumatism, left knee

This code signifies a diagnosis of palindromic rheumatism affecting the left knee. 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 considered a precursor to rheumatoid arthritis in a significant number of cases.

Use this code when documentation explicitly states a diagnosis of palindromic rheumatism localized to the left knee. This diagnosis is typically supported by a history of recurrent, acute inflammatory arthritis episodes in the left knee with complete resolution, and often negative serology for rheumatoid factor or anti-CCP antibodies during quiescent periods.

• Ensure the laterality (left knee) is clearly documented. If bilateral, use the appropriate bilateral code or separate codes for each knee.
• Distinguish from other forms of inflammatory arthritis, especially early rheumatoid arthritis, which may present similarly but have persistent inflammation.
• Do not use this code if the condition has progressed to definite rheumatoid arthritis; instead, code the specific rheumatoid arthritis diagnosis.