ICD-10 Code I27 – Other pulmonary heart diseases (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27 – Other pulmonary heart diseases
What it is
I27 covers pulmonary heart disease conditions that do not fit a more specific code. It refers to disorders in which lung or pulmonary vascular disease affects the right side of the heart.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include signs of right heart strain or failure, but the exact diagnosis should be supported by the provider’s wording and underlying pulmonary condition.
When to use this code
Use I27 when the record documents a pulmonary heart disease diagnosis and no more specific ICD-10 code is available. It may apply when the provider identifies right heart involvement related to pulmonary or pulmonary vascular disease. Check documentation for the exact subtype before assigning this code.
Do not use for
Do not use I27 if the documentation supports a more specific pulmonary hypertension or cor pulmonale code. Also avoid it when the condition is not clearly linked to pulmonary heart disease or the provider has not documented the diagnosis.
Coding tip
Always code the most specific pulmonary heart disease documented, and verify whether the record names a distinct subtype before defaulting to I27.