Malignant pericardial effusion in diseases classd elswhr

This code signifies the presence of fluid accumulation in the pericardial sac that is cancerous, but the primary malignancy originates from a site other than the pericardium itself. This effusion is a secondary manifestation of a systemic neoplastic process.

Apply this code when documentation clearly indicates a malignant pericardial effusion and specifies that the malignancy is metastatic or secondary to a primary cancer located elsewhere in the body. This is commonly seen in patients with advanced lung cancer, breast cancer, or lymphoma.

• Always code the underlying primary malignancy first, followed by this code.
• Ensure documentation explicitly states "malignant" and "pericardial effusion" and clarifies the primary site of cancer.
• Do not use for primary pericardial malignancies or effusions due to non-malignant causes.