ICD-10 Code I27.29 – Other secondary pulmonary hypertension (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27.29 – Other secondary pulmonary hypertension
What it is
I27.29 identifies pulmonary hypertension caused by another underlying condition, when it does not fit a more specific secondary pulmonary hypertension code. Use it for elevated pressure in the lung arteries linked to a documented cause.
Clinical signs
Clinical features vary; refer to documentation. Common findings include exertional shortness of breath, fatigue, chest discomfort, or right-sided heart strain, but the record should support pulmonary hypertension and its secondary cause.
When to use this code
Use this code when the provider documents secondary pulmonary hypertension and the cause is not captured by a more specific ICD-10 code. It may apply when the record names another underlying disorder, but not a more precise category. Confirm the documented relationship between the lung pressure elevation and the primary condition.
Do not use for
Do not use I27.29 for primary pulmonary hypertension or for secondary pulmonary hypertension that has a more specific code. Check documentation if the cause is unclear or if the condition is better described elsewhere.
Coding tip
Code the underlying condition first when the record supports it, and use I27.29 only when the secondary pulmonary hypertension is clearly documented.