The Chicago MED series, along with FIRE & P.D are all great series from NBC. Great characters & storylines, and when they do a cross-over with all 3 series, the cross-over episodes are usually even better. I highly recommend watching Chicago MED as they deal with many medical issues which I'm sure everyone can relate to in one way are another.
NBC did try to include Chicago JUSTICE, based primarily in the courts, and I really do like law procedural dramas, but I just couldn't get into 'JUSTICE; and given how long it ran for, many other viewers seemed to agree, as it was cancelled after just 1 season - whereas at the time of writing this, 'MED' is on its 5th season, 'FIRE' is on its 8th & 'P.D.' is on its 7th season. There was just a lot missing in 'JUSTICE', including good characters & storylines - which certainly isn't an issue with 'MED' and the other 2 series.