What does 家 mean in 家医院? I came across 家医院 in example sentences in an anki deck I downloaded. 
I know that 医院 means hospital. I tried to look up 家医院 in two dictionaries but could not find it. 

What is 家医院? Is it equivalent to 医院? 

It appears for example in the following sentence:

他在那家医院工作。
家 is the measurement word for  医院