Kioumourtzoglou was a head coach of five teams in Greece’s top-tier level Basket league.

Kioumourtzoglou continued to significantly contribute to establishing Greece's national team as being among the great powers of European basketball of the era, by leading them to a fifth place finish at the 1991 EuroBasket.

Kioumourtzoglou resigned from his position as the head coach of the Greek national team on July 30, 1994, shortly before the start of the 1994 FIBA World Championship, which took place in Toronto.

He resigned from his position, after his efforts to maintain discipline in the team, following an incident with Greece's main center Panos Fasoulas.

He was replaced as the team's head coach by his lead assistant, Makis Dendrinos, who led Greece to a fourth place finish at the tournament.