ICD-10 Code I27.23 – Pulmonary hypertension due to lung diseases and hypoxia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27.23 – Pulmonary hypertension due to lung diseases and hypoxia
What it is
I27.23 identifies pulmonary hypertension caused by chronic lung disease or low oxygen levels. Use it when the elevated pressure in the pulmonary arteries is documented as secondary to hypoxia or a lung disorder.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include exertional dyspnea, fatigue, and evidence of pulmonary hypertension on clinical evaluation or testing, with an underlying lung disease or hypoxic state noted.
When to use this code
Use this code when the provider documents pulmonary hypertension due to chronic respiratory disease, hypoxia, or both. It is appropriate when the cause is clearly linked to lung disease rather than a primary pulmonary vascular disorder. If the record does not specify the cause, check documentation.
Do not use for
Do not use this code for primary pulmonary hypertension or pulmonary hypertension from other causes. Do not assign it when the chart only shows lung disease or hypoxia without documented pulmonary hypertension.
Coding tip
Always confirm the underlying lung condition and the causal relationship before coding I27.23.