Video game music is actually designed to increase your ability to concentrate on the game. I highly recommend listening to some as you're coding. You can get it at Bandcamp [1,2]. Trance music also works, especially Goa Trance.
Binaural beats [3,4] are also worth a try.
[1] https://bandcamp.com/tag/video-game
[2] https://bandcamp.com/tag/video-game-music
[3] https://en.wikipedia.org/wiki/Beat_(acoustics)#Binaural_beat...