In patient care areas they specify a metal wiring method suitable for grounding with a redundant ground wire. No plastic. Other places don't require redundant ground as far as I know. The acceptibility of the wiring method will be up to the other articles in the code.
nursing home is listed in the def. of a health care facility. The same rules apply, chap. 3 wiring methods in non-patient care areas, insulated EGC in metal raceways in patient care areas