pimite;
In most states you get your DEA # after your permanent liscense has been issued. You can get these after your first year of residency and after passing Step 3 of the boards (again, after 1st year of residency in most states: Illinois requires two years of residency before permanent liscensure).
Start the process early because it'll take several months for everything to come back from state liscensing boards and additional time to apply and get staff priviledeges at hospitals to moonlight.