Extension Study of Sotatercept in People With Pulmonary Hypertension (MK-7962-023)

Inclusion Criteria: The main inclusion criteria include but are not limited to the following: \- Completed MK-7962-007 (CADENCE) (Visit 9 and end of treatment \[EOT\] visit) without discontinuing study intervention and is able to safely enroll into MK-7962-007 (HARMONIZE) Exclusion Criteria: The main exclusion criteria include but are not limited to the following: * Has a diagnosis of pulmonary hypertension (PH) in world health organization (WHO) Group 1, WHO Group 3, WHO Group 4, or WHO Group 5 * Has had a study intervention interruption * Is pregnant or breastfeeding * Has chronic liver disease with severe hepatic impairment and/or cirrhosis (eg, hepatic encephalopathy) * Anticipation of more than 1 valve replacement or repair (mechanical or biomechanical) and/or have undergone more than 1 valve replacement or repair * Has severe tricuspid regurgitation due to primary valvular disease (eg, from endocarditis, carcinoid, or mechanical destruction) * Anticipated or undergone heart transplant or ventricular assist device implantation * Has had prior exposure to luspatercept