I have a friend who works at LMH and I've had lunch with her at the japanese place (I cannot recall the name) in view of the entrance (north side of the parking lot). It was okay, streamlined, but good for a quick lunch.
If you have an hour or more, try Nikko Sushi just across the Fraser Highway from the hospital. It's a clean restaurant with friendly service, good food, and quality prices. Now that we've been a few times, they comp us a dish here and there...
If you want a cuisine from somewhere other than the Land of the Rising Sun, you'll have to drive ten minutes west down the Fraser Highway where you have a choice of almost anything from Pho to French.
22372 Fraser Hwy, Langley