Chronic pulmonary embolism

This code represents a persistent or recurrent obstruction of the pulmonary arteries by embolic material, typically blood clots, leading to chronic symptoms and often pulmonary hypertension. Unlike acute pulmonary embolism, chronic forms involve organized thrombi that may partially or completely occlude vessels over time. This condition can significantly impair gas exchange and cardiac function.

Use this code when documentation clearly indicates a diagnosis of chronic pulmonary embolism, often supported by imaging studies showing organized thrombi or evidence of long-standing pulmonary vascular obstruction. This diagnosis is typically made after acute symptoms have resolved or when patients present with progressive dyspnea and signs of right heart strain without an acute event.

• Differentiate carefully between acute (415.1x) and chronic pulmonary embolism; the chronicity must be explicitly stated or clearly implied by clinical context.
• Code any associated pulmonary hypertension (e.g., 416.0) as an additional diagnosis, as it is a common complication.
• Ensure documentation specifies the chronicity, as "pulmonary embolism" alone is insufficient for this code.