ICD-10 Code I27.81 – Cor pulmonale (chronic) (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27.81 – Cor pulmonale (chronic)
What it is
Code I27.81 identifies chronic cor pulmonale, a long-standing enlargement or failure of the right side of the heart caused by lung disease or pulmonary vascular disease. Use it when the record clearly documents chronic right heart strain from a pulmonary cause.
Clinical signs
Typical findings include signs of right-sided heart strain, such as peripheral edema, jugular venous distention, or hepatomegaly. Clinical features vary; refer to documentation and the underlying pulmonary disorder.
When to use this code
Use I27.81 when the provider documents chronic cor pulmonale, chronic right ventricular failure due to lung disease, or right heart disease secondary to chronic pulmonary hypertension. It may appear with COPD, interstitial lung disease, or other chronic respiratory conditions if the causal link is documented.
Do not use for
Do not use this code for acute cor pulmonale or for nonspecific heart failure without a documented pulmonary cause. Check documentation if the record only mentions pulmonary hypertension or right heart strain.
Coding tip
Always code the underlying lung condition first when documented, and verify that the provider specifically states chronic cor pulmonale.