Chicago Med,” the third Dick Wolf drama in the “Chicago” trilogy, opened to promising ratings Tuesday, sandwiched between hits “The Voice” and “Chicago Fire” and helping the net carry the night in key demo categories. The Peacock won all six primetime half-hours in adults 18-49, 25-54 and 18-34.

According to preliminary national estimates from Nielsen, “Chicago Med” averaged a 2.2 rating/7 share in adults 18-49 and 8.6 million viewers overall in the 9 p.m. hour, neck and neck with CBS veteran “NCIS” as Tuesday’s top scripted series in the demo. It benefited from its “The Voice” lead-in (2.6/9 in 18-49, 11.1 million viewers overall), with the music contest standing as the night’s No. 1 program in 18-49, 25-54 (3.5/10) and 18-34 (1.6/6). From its first half-hour to its second, “Med” was down a tenth in 18-49 (2.2 to 2.1) and 25-54 (2.9 to 2.8) and steady in 18-34 (1.4).

Among all drama series premieres this fall, “Chicago Med” ranks fifth in same-day 18-49 rating — behind CBS’ “Supergirl” and AMC’s “Into the Badlands” (both 3.15), NBC’s “Blindspot” (3.1) and Fox’s “Rosewood (2.4). “Blindspot” also had a direct lead-in from “The Voice,” though the reality series was considerably higher-rated that September night (3.5 in 18-49, including a 3.8 for its final, 9:30 p.m. half-hour).

“Med” opened a little higher than both “Chicago Fire” in October 2012 (1.9 in 18-49, 6.6 million viewers overall) and “Chicago PD” in January 2014 (2.0 in 18-49, 8.6 million viewers overall). “Fire” and “PD” both premiered in the 10 o’clock hour behind “Law & Order: SVU,” which provided a lower, though perhaps more compatible, lead-in than last night’s “The Voice.”

NBC capped its winning night with another victory at 10 p.m. for “Chicago Fire” (1.9/6 in 18-49, 7.9 million viewers overall), which nearly matched its season high of last week. And the strong Tuesday in primetime carried over to late-night, where “The Tonight Show Starring Jimmy Fallon” (1.1 rating in adults 18-49) topped the combined totals of ABC’s “Jimmy Kimmel Live” (0.5) and CBS’ “Late Show with Stephen Colbert” (0.5), according to overnight results from Nielsen’s 25 markets with local people meters. And “Late Night with Seth Meyers” (0.6), despite airing an hour later, also bested Kimmel and Colbert.

Elsewhere in primetime Tuesday, CBS was a solid second in demos with its crime dramas “NCIS” (2.1/7 in 18-49, 16.5 million viewers overall), “NCIS: New Orleans” (1.6/5 in 18-49, 12.9 million viewers overall) and “Limitless” (1.4/5 in 18-49, 7.6 million viewers overall) — each of which was down slightly from last week. “NCIS” remained Tuesday’s most-watched show overall by a mile and was the night’s No. 1 scripted series in adults 25-54 (3.2/9). In total viewers for the night, CBS beat runner-up NBC by about 3 million (12.3 million vs. 9.2 million).

ABC’s comedies “The Muppets” (1.2/4 in 18-49, 3.9 million viewers overall) and “Fresh Off the Boat” (1.4/4 in 18-49, 3.8 million viewers overall) remained on the low side, with the former steady and the latter up a tick week to week. Also holding steady was “Marvel’s Agents of SHIELD” at 9 (1.3/4 in 18-49, 3.6 million viewers overall), and a repeat “Shark Tank” (0.7/2 in 18-49, 2.5 million viewers overall) was an improvement over the numbers that cinched the cancellation of “Wicked City” (0.4 in 18-49, 1.7 million).

At Fox, “Grandfathered” (1.0/3 in 18-49, 3.0 million viewers overall) matched its score of last week “The Grinder” (0.9/3 in 18-49, 2.4 million viewers overall) edged up a tenth. “Scream Queens” (0.9/3 in 18-49, 2.4 million viewers overall) was on par with last week’s low as it nears its finale next month. Fox will be shifting to half-hour comedies in the 9 o’clock hour starting in January, and they will be a clear alternative in this now drama-heavy hour.

CW’s “The Flash” (1.3/4 in 18-49, 3.3 million viewers overall) came back to earth after hitting a season high last week, tying with the ABC comedy hour in 18-49 and beating Fox’s own laffers. “iZombie” (0.5/2 in 18-49, 1.3 million) was down a tick from the 0.6 it had done the prior three weeks.