Primary pulmonary hypertension

This code signifies a rare and severe form of high blood pressure in the arteries of the lungs, specifically when the cause is unknown or idiopathic. It leads to progressive narrowing and thickening of the pulmonary arteries, increasing the workload on the right side of the heart. This condition can ultimately result in right heart failure.

This code is appropriate for documenting a diagnosis of primary pulmonary hypertension, also known as idiopathic pulmonary arterial hypertension (IPAH). Documentation should clearly state "primary" or "idiopathic" pulmonary hypertension, often supported by right heart catheterization findings and exclusion of secondary causes.

• Ensure the documentation explicitly states "primary" or "idiopathic" to differentiate from secondary forms.
• Do not use this code if a specific underlying cause for the pulmonary hypertension is identified (e.g., chronic obstructive pulmonary disease, congenital heart disease).
• Consider sequencing this code as the principal diagnosis when it is the primary reason for the encounter and treatment.