Hospital officials on Tuesday announced the renovations and expansion will occur in phases over the next five years.
The makeover will include almost doubling the size of the 118-year-old hospital's emergency department and enlarging its intensive care unit.
The hospital's chief executive, Tom Gammiere, says the recent closure of local hospitals, plus increased demand for ER services in the area, prompted the need for growth.
Hospital spokesman Ty Kennon says Scripps Mercy's nonprofit operator Scripps Health will borrow most of the $153 million it is contributing for the project. Donations will make up the remaining $50 million.
Read more about this story in the Union-Tribune's article, "Scripps Mercy announces $203 million expansion."