From November 2015 to April 2016, he was the acting president of the German Football Association along with Reinhard Rauball.

Up to 1986, Koch refereed nearly 1,000 football matches, including some in the Bayernliga, which was then the third highest league in Germany.

After a work-related break, Koch returned again in 1990 to the BFV and became chairman of the Jugend-Sportgericht (Youth Sport Court) in the district of Upper Bavaria.

[8] As president, he visited the district and regional days in BFV, promoted the efforts against match fixing,[9] and strengthened the lower divisions in the association.

[10] Koch was elected in 2005 as vice president of the board of the Southern German Football Association (Süddeutscher Fußball-Verband, SFV).

[8] In 1996, Koch was made assessor of sports court of the German Football Association (Deutscher Fußball-Bund, DFB), to which he was elected chairman in 1998.

[15] On 25 October 2013, Koch took over the responsibility for amateur football as 1st Vice President of the DFB board.

[17] In connection with possible bribes before the 2006 FIFA World Cup, on 9 November 2015, Koch demanded a public announcement about the operations from Franz Beckenbauer and explained that it was absolutely necessary "that he is intensively introduced in the elucidation of the processes.