Officers responded just after 5 p.m. to the reported bomb threat at 2650 Ridge Ave.
Police found a suspicious package with wires sticking out of it outside the building, officials said.
Evanston fire crews are deploying a drone, and the Cook County Bomb Squad is responding.
The public is urged to avoid the area.
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Surrounding areas were evacuated, police said.
Hospital officials said there is no immediate threat, and the facility remains open.
They said about 7:30 p.m. that the situation had been cleared.
Police did not immediately provide an additional update.
This is a developing story; check back with ABC7 Chicago for updates.