WILL STRUGGLES WITH A DIAGNOSIS

Goodwin, Maggie and Crockett help victims of a hit-and-run accident.

Will struggles to diagnose a patient with seizures.

Hannah and Archer clash with Jack Dayton.

Air Date: Wednesday, Jan. 18 (08:00PM – 09:00PM) on NBC.

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CHICAGO MED -- "We All Know What They Say About Assumptions" Episode 812 -- Pictured: Marlyne Barrett as Maggie Lockwood -- (Photo by: George Burns Jr/NBC)