Patients with general inquiries, Patient Portal and COVID-19 specific questions, please call our Patient Support Group at 888-279-0967, available M-F 8AM-8PM ET and Sa/Su 9AM-5PM ET. Patients with billing and insurance questions, please call Billing Customer Service at 1-833-4MYLABS ( 833-469-5227 ), available M-F 8AM-7PM ET. Headquarters:.