Mount Sinai South Nassau is a hospital located in Oceanside, New York.

[1] It has expanded numerous times over the years and is now one of the main hospitals on the South Shore of Long Island.

Long Beach Medical Center was a full hospital before it closed, as opposed to a stand alone emergency department.

[4] In 2017, South Nassau's former partner Winthrop joined Mount Sinai competitor NYU Langone Health.

[6] What caused Winthrop South Nassau to split from New York Presbyterian is unclear.