Rheumatoid heart disease w rheumatoid arthritis of left knee

This code signifies a systemic autoimmune disorder characterized by chronic inflammation affecting the left knee joint, accompanied by cardiac manifestations directly attributable to the rheumatoid disease process. It indicates that the patient's rheumatoid arthritis has progressed to involve the heart, leading to conditions such as pericarditis, myocarditis, or valvular disease.

Apply this code when documentation explicitly states a diagnosis of rheumatoid arthritis affecting the left knee, and there is clear evidence of associated heart disease. This typically requires physician documentation linking the cardiac involvement directly to the rheumatoid process, often supported by diagnostic tests like echocardiograms or cardiac MRI.

• Ensure the documentation specifies "rheumatoid heart disease" and not just general heart disease in a patient with rheumatoid arthritis.
• Verify laterality for the affected knee; this code is specific to the left knee.
• Sequence this code as the primary diagnosis when the rheumatoid heart disease is the focus of the encounter, or as a secondary diagnosis when it is a co-morbidity.