ICD-10 Code I27.9 – Pulmonary Heart Disease, Unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27.9 – Pulmonary heart disease, unspecified
What it is
I27.9 identifies pulmonary heart disease when the documentation does not specify the cause or type. It refers to right-sided heart strain or failure related to lung or pulmonary vascular disease.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include signs of right heart involvement, such as edema, jugular venous distention, or dyspnea linked to chronic lung disease.
When to use this code
Use I27.9 when the provider documents pulmonary heart disease but does not name a more specific diagnosis. It is appropriate when the record supports cor pulmonale or right heart disease secondary to pulmonary pathology, yet the exact subtype is not stated. Check documentation if another I27.- code is specified.
Do not use for
Do not use this code when the record identifies a specific pulmonary hypertension or other more detailed I27.- condition. Do not assign it for isolated left-sided heart disease or nonspecific shortness of breath without documented pulmonary heart disease.
Coding tip
Query the provider when the note suggests cor pulmonale but the relationship to lung disease is unclear.