When an apple a day doesn't keep the illness away, perhaps Apria Healthcare Group can help. With more than 550 branches nationwide, Apria is one of the country's largest home health firms. The company provides supplemental oxygen, ventilators, nebulizers, and sleep monitoring equipment and medication (as well as care and support) to patients with emphysema, sleep apnea, negative pressure wound therapy (NPWT), and other respiratory conditions. Apria also delivers home medical equipment such as walkers, hospital beds, and wound therapy devices. Apria sold its Coram infusion therapy subsidiary in 2014 to focus on its core business. The company is owned by the Blackstone Group.