Take a look at IEC60601-1-2. It describes test levels and requirements. You will also need to check particular standard for your equipment, sometimes it differs from type to type. So, at first, you need to choose "basic" standard for your device. There should be Section 36, check it for particular test reqirements.
For test methods look at IEC61000-4-2(Electrostatic discharge immunity test), IEC61000-4-3(Radiated, radio-frequency, electromagnetic field immunity test), IEC61000-4-5(Surge immunity test), IEC61000-4-6(Testing and measurement techniques Voltage dips, short interruptions and voltage variations immunity tests). May be this list is incomplete, but i can't remebmer all others.
But, in general, any EMC lab has own testplan, you only need to supply them with your divece and to look after them, to prevent damage for the device... ;-)
alex