ICD-10 Code I28.1 – Aneurysm of pulmonary artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I28.1 – Aneurysm of pulmonary artery
What it is
I28.1 identifies a localized abnormal dilation of the pulmonary artery. Use it when documentation states an aneurysm of the pulmonary artery, including main or branch pulmonary artery aneurysm.
Clinical signs
Clinical features vary; refer to documentation. Patients may have chest pain, dyspnea, cough, or may be asymptomatic, with the finding noted on imaging or during evaluation for another condition.
When to use this code
Use I28.1 when the provider documents a pulmonary artery aneurysm or aneurysmal dilation of the pulmonary artery. It may be supported by imaging reports, operative notes, or specialist assessment. Check documentation if the report is unclear about the vessel involved.
Do not use for
Do not use this code for aneurysms of the aorta or other arteries, or for nonspecific vascular dilation without a documented pulmonary artery aneurysm. Check documentation for the exact anatomic site.
Coding tip
Confirm the phrase “pulmonary artery” appears in the final provider diagnosis or impression before assigning I28.1.