Northern Ireland miss out on World Cup play off seeding
Denmark have moved up seven places in the rankings and will be seeded along with Switzerland, Italy and Croatia.
They will each be drawn against unseeded Northern Ireland, Republic of Ireland, Sweden and Greece.
The draw will take place on Tuesday, 17 October at 1pm in Zurich.
The games will take place on a home and away basis, with the first legs taking place between 9 and 11 November and the second legs between 12 and 14 November.
The first team drawn for each of the ties will be at home for the first leg.
Northern Ireland were 20th in Fifa's previous rankings list but they lost to Germany and Norway in their final two group games on the way to finishing as Group C runners-up.
Meanwhile, Denmark beat Montenegro and drew with Romania in their last two World Cup qualifiers.