Nepean Hospital will receive $1 million in next week's state budget, but doctors say the hospital is in crisis mode and in urgent need of funding for frontline services.

The $1million is part of a $4 million election promise to fund planning for the redevelopment of the western Sydney hospital, and builds on $1 million allocated in the last state budget.

An estimated $360-$370 million will eventually be needed to rebuild the hospital, where doctors say a chronic shortage of emergency beds, huge waiting times for surgeries and overstretched staff have pushed it breaking point.

Dr Nhi Nguyen, an intensive care doctor and the chair of the hospital's medical staff council, said Nepean was "in crisis mode" leading into winter.