http://www.hdmagazine.co.uk/story.asp?storyCode=2023879 gives an example, although I think that this still does not refer to the separate (smaller) entrance corridor to each patient room (which is meant here IMHO):

"The layout of the building reflects the needs of the two main user groups. The hospital and clinical blocks are slightly offset from each other and are built around two internal courtyards. These blocks are separated from the smaller GP surgeries by a double height entrance hall - a spine corridor running through the middle of the complex with curtain walls and sliding doors to access the GP practices. Projecting like fingers from the ***entrance corridor***, the GP surgeries are separated from each other by garden courtyards –again bringing light flooding in to patient areas."

That being said, I do think that "entrance corridor" fits the bill in this case.