Pulmonary hypertension due to left-sided heart disease (PH-LHD), classified by the World Health Organization (WHO) into group 2 pulmonary hypertension, is the most common cause of pulmonary hypertension and is associated with impaired exercise capacity and reduced survival.
Pulmonary hypertension, unspecified I27. 20 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2022 edition of ICD-10-CM I27. 20 became effective on October 1, 2021.
Group 1: Pulmonary Arterial Hypertension (PAH) WHO Group 1 refers to pulmonary arterial hypertension (PAH), which is caused when the arteries in the lungs become narrowed, thickened or stiff. The right side of the heart must work harder to push blood through these narrowed arteries.
Having pulmonary arterial hypertension (PAH) means that you have high blood pressure in the arteries that go from your heart to your lungs . It's different from having regular high blood pressure. With PAH, the tiny arteries in your lungs become narrow or blocked.