Chicago Med season 4

The fourth season of Chicago Med, an American medical drama television series with executive producer Dick Wolf, and producers Michael Brandt, Peter Jankowski, Andrew Schneider and René Balcer (uncredited), was ordered on May 9, 2018. The season premiered on September 26, 2018, with a time slot change from Tuesday at 10:00 PM to Wednesday at 8:00 PM. The season concludes on May 22, 2019, and contained 22 episodes.

Main characters

 * Nick Gehlfuss as Dr. Will Halstead, Attending Emergency Physician
 * Yaya DaCosta as April Sexton, RN
 * Torrey DeVitto as Dr. Natalie "Nat" Manning, Emergency Medicine/Pediatrics Fellow
 * Colin Donnell as Dr. Connor Rhodes, Attending Trauma Surgeon
 * Brian Tee as LCDR Dr. Ethan Choi, Attending Emergency Physician
 * Marlyne Barrett as Maggie Lockwood, RN, ED Charge Nurse
 * Norma Kuhling as Dr. Ava Bekker, Cardiothoracic Surgery Attending
 * S. Epatha Merkerson as Sharon Goodwin, Chief of Patient Services
 * Oliver Platt as Dr. Daniel Charles, Chief of Psychiatry

Recurring characters

 * Brennan Brown as Dr. Samuel "Sam" Abrams
 * Ato Essandoh as Dr. Isidore Latham
 * D. W. Moffett as Cornelius Rhodes
 * Mekia Cox as Dr. Robin Charles
 * Cynthia Addai-Robinson as Dr. Vicki Glass
 * C.S. Lee as Bernard "Bernie" Kim
 * Michel Gill as Robert Haywood (debut)
 * Arden Cho as Emily Choi
 * Molly Bernard as Dr. Elsa Curry (debut)
 * Eddie Jemison as Dr. Stanley Stohl
 * Heather Headley as Gwen Garrett
 * Marc Grapey as Peter Kalmick
 * Anna Enger Ritch as Agent Ingrid Lee
 * Patti Murin as Dr. Nina Shore
 * Roland Buck III as Dr. Noah Sexton
 * Nate Santana as Dr. James Lanik
 * Casey Tutton as Nurse Monique Lawson
 * Lorena Diaz as Nurse Doris
 * Amanda Marcheschi as Nurse Dina Garston
 * Peter Mark Kendall as Joey Thomas
 * Colby Lewis as Terry McNeal
 * Dennis Cockrum as Ray Burke
 * Devin Ratray as Tommy Burke
 * Adam Petchel as Timothy "Tim" Burke
 * Paula Newsome as Caroline Charles
 * Ian Harding as Phillip Davis

Guest stars

 * Rachel DiPillo as Dr. Sarah Reese (Season 4 premiere)

Crossover characters

 * Jesse Spencer as Captain Matthew Casey
 * Taylor Kinney as Lieutenant Kelly Severide
 * Eamonn Walker as Chief Wallace Boden
 * David Eigenberg as Lieutenant Christopher Hermann
 * Yuri Sardarov as Firefighter Brian "Otis" Zvonecek
 * Joe Minoso as Firefighter Joe Cruz
 * Christian Stolte as Firefighter Randy "Mouch" McHolland
 * Miranda Rae Mayo as Firefighter Stella Kidd
 * Randy Flagler as Firefighter Harold Capp
 * Kara Killmer as Paramedic in Charge Sylvie Brett
 * Jason Beghe as Sergeant Hank Voight
 * Jesse Lee Soffer as Detective Jay Halstead
 * Tracy Spiridakos as Detective Hailey Upton
 * Patrick John Flueger as Adam Ruzek
 * Marina Squerciati as Officer Kim Burgess

Casting
Having made her first appearance in the finale of season 3, Heather Headley is set to recur in season 4 as Chicago Med's new COO, Gwen Garrett.

On July 23, 2018, it was announced that Molly Bernard and Colby Lewis would be joining the cast as med students Elsa Curry and Terry McNeal respectively.

After three seasons as Dr. Sarah Reese, Rachel DiPillo left the series during the season premiere of Season 4.

On April 19, 2019, NBC announced that Colin Donnell and Norma Kuhling would depart the series at the end of the season due to creative reasons. Donnell and Kuhling appeared in the season 5 premiere to wrap up their character's storyline.

Home media
The DVD release of season four was released in Region 1 on August 27, 2019.