I would think the the drill cycle you would be using is G74 since you are on the center of the part
G74X0.Z-2.000 D.312K.150L.312F.005
Okumawiz would have a better answer for you but i think that g181 is optional for M tool (live tooling)
G17, G18,G19 Are listed as optional in my manual and would think that unless you have live tooling you didn't get the options of G17,G19 which would be for milling