[2] It featured a new surgical suite, an emergency facility and an intensive care unit.

In 1998, the hospital opened the Matthew J. and Debra A. Cody Ambulatory and Inpatient Surgical Pavilion.

In 2015, the Arthur & Linda Calace Family Pavilion was dedicated, housing a 35-single-bedded patient care unit; offices and teaching facilities for the Graduate Medical Education Program and a conference center.

Mather also has an outpatient Wound Care Treatment Center and a Hyperbaric Oxygen Therapy unit.

Mather Hospital has medical residency programs in internal medicine, transitional year, psychiatry, diagnostic radiology and integrated interventional radiology through The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell along with fellowships in gastroenterology and hematology/oncology.