In simple words: This code describes a condition where blood clots in the lungs that have lasted a long time, causing ongoing problems. If the person is taking blood thinners regularly, another code will also be used.

This code signifies chronic pulmonary embolism, a condition where blood clots obstruct the pulmonary arteries.It is a long-term complication of pulmonary embolism and should be coded separately from acute pulmonary embolism.An additional code (Z79.01) should be used if the patient is on long-term anticoagulant therapy.This code excludes a personal history of pulmonary embolism.

Example 1: A 60-year-old female with a history of deep vein thrombosis presents with recurrent shortness of breath and chest pain. Imaging studies reveal chronic pulmonary emboli.I27.82 is coded, along with Z79.01 for long-term anticoagulation., A 75-year-old male with a history of atrial fibrillation and recent pulmonary embolism now experiences persistent dyspnea and reduced exercise tolerance. Chronic pulmonary embolism is confirmed by imaging, and I27.82 is coded.Additional codes are added to capture the underlying condition (atrial fibrillation) and comorbidities., A 45-year-old female with a previous episode of pulmonary embolism is now experiencing worsening symptoms. Imaging shows evidence of chronic pulmonary embolism, requiring I27.82.The code Z86.711 (Personal history of pulmonary embolism) is excluded.

Medical history, physical examination findings, imaging studies (CT pulmonary angiography, ventilation-perfusion scan), laboratory results (D-dimer), and documentation of anticoagulant therapy.

** Differential diagnosis should rule out other causes of respiratory symptoms.Consider use of additional codes for associated conditions like cor pulmonale or pulmonary hypertension.