Mark Haltrecht DO Meredith Corson DO. 389 Merrick Ave Merrick, NY 11566 (516) 867-5132 (516) 867-5519 fax. The Doctor's Office opened its doors on March 10th, 2014 offering family practice, holistic health and immediate care services. Walk-ins will be accepted for immediate evaluation and care, and appointments for your favorite provider will ....