[1] It operates four acute hospitals with emergency departments (Bowmanville, Oshawa, Port Perry, Ajax and Pickering), one specialty hospital with a regional mandate (Whitby) and a variety of offsite locations.

In January 2004, the Uxbridge site became aligned with Markham Stouffville Hospital and left the Lakeridge grouping.

With the merger of Rouge Valley Health System and The Scarborough Hospital, management of the Rouge Valley Ajax and Pickering site was transferred to Lakeridge Health on December 1, 2016.

[6] Lakeridge Health offers primary, secondary, tertiary and post-acute care in inpatient and ambulatory settings.

Services provided across Lakeridge Health are organized into eight clinical programs: