Is there anything in the codebook the says we need to test gfci receptacles once a month in a health care facility or in a residential dwelling?
Other than stretching 110.3(B) into this there is nothing in the NEC about it. I feel like Dnkldorf does about 110.3(B).
Who is the one responsible for the testing and enforcement of the testing?
However health care facility's fall under many codes and it would not surprise me if regular testing of GFCIs is required by one or more of these other codes.
Also there are OSHA rules regarding the testing of GFCIs.