The rules in this situation are pretty straightforward, according to the ABEM (American Board of Emergency Medicine).
You are ELIGIBLE for a maximum of 6 months of credit/advanced standing for prior training. However, you have to have done at least TWO years of the training (that excludes folks doing just an internship year), within 5 years of entering the EM program. ELIGIBLE means that any advanced credit is at the discretion of the EM program director (it's not an automatic deal). If you are going to do this, it must be done IN ADVANCE of starting the residency program, or it won't be granted.
You cannot get credit for any EM rotations (i.e., you still have to complete all the EM training months). Obviously any IM trained person would not likely be required to repeat any IM floor rotations. ICU/CCU time would be at program director discretion as well.
Hope this helps. You can check with the American Board of Emergency Medicine to get a copy of the official policy if you need it.
Marc Squillante, DO, FACEP, FAAEM
Director, EM Residency Program
OSF St. Francis Medical Center/ Univ. of Illinois College of Medicine @ Peoria, IL