I27.29

HCC Category Mapping

What This Code Means

High blood pressure in the lung arteries caused by other secondary conditions not specifically classified in the I27.2 category.

Coding Tips

• •Use this code only when the secondary cause does not fit into I27.21, I27.22, I27.23, or I27.24
• •Document the specific secondary cause in the medical record to support medical necessity and allow for future specificity

Clinical Significance

This code captures secondary pulmonary hypertension from causes not classified in the more specific I27.21-I27.24 subcategories. It represents complex multi-system disease where the pulmonary vasculature is affected by rare or unusual underlying conditions. Accurate documentation of the specific secondary cause is essential.

Documentation Requirements

• ✓Provider diagnosis of secondary pulmonary hypertension
• ✓Documented underlying cause that does not fit I27.21 through I27.24 categories
• ✓Evidence of elevated pulmonary artery pressures
• ✓Clinical documentation explaining why the specific secondary cause codes do not apply
• ✓Treatment plan addressing both the pulmonary hypertension and underlying condition

Commonly Confused Codes