ICD-10 Code I27.20 – Pulmonary hypertension, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I27.20 – Pulmonary hypertension, unspecified
What it is
I27.20 identifies pulmonary hypertension when the record does not specify a cause or type. It means elevated pressure in the pulmonary arteries, but the documentation is not detailed enough for a more specific code.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include exertional shortness of breath, fatigue, chest discomfort, syncope, or evidence of right heart strain on evaluation.
When to use this code
Use I27.20 when the clinician documents pulmonary hypertension without naming a secondary cause, subtype, or associated condition. It is also appropriate when the note confirms pulmonary hypertension but does not provide enough detail for a more specific code.
Check the chart for related conditions such as congenital heart disease, chronic lung disease, thromboembolic disease, or left heart disease, because those may require a different code. If the documentation is unclear, query for specificity.
Do not use for
Do not use this code when the record identifies a specific pulmonary hypertension category or underlying cause. Do not assign it for suspected pulmonary hypertension without confirmed documentation.
Coding tip
Code the documented type first whenever the record gives a clearer pulmonary hypertension diagnosis than “unspecified.”