Five touchdown passes from Peyton Manning, four to Eric Decker, fueled the Broncos to a 35-28 win over the Chiefs and gave them sole possession of the divisional lead.
The Chiefs (9-3) jumped out to a 21-7 lead in the first half after Alex Smith was intercepted in the end zone in the game's opening series. Alex Smith connected on touchdown completions with Junior Hemmingway from 17 yards late in the first quarter and again to Anthony Fasano for 12 yards with 10:57 left in the second frame.
Fasano left the game after suffering a concussion, while left tackle Branden Albert was carted off the field with a knee sprain, adding to a list of injuries for the offensive line.
Also playing without Justin Houston, the Chiefs failed to sack Peyton Manning again, but Quinten Demps and Marcus Cooper intercepted the Denver (10-2) quarterback in the first half. Kansas City has just two sacks in their last five games.
After Manning and Decker opened the second quarter with their first touchdown hookup, rookie running back Knile Davis returned the ensuing kickoff 108 yards to the end zone for the longest play in Chiefs history.
Manning's other scoring strike went to Knowshon Moreno, cutting Kansas City's lead to 21-14 at the break. Decker's next three scores would come unanswered from one, 15, and 37 yards out.
Down 35-21, the Chiefs drove 80 yards on 17 plays, ending with a one-yard plunge from Jamaal Charles. The back finished with 93 yards on 19 carries plus two grabs for 27 yards receiving.
Kansas City's final chance to tie the game fell short when Mike Adams broke up Smith's pass intended for Dwayne Bowe in the end zone.