Do I need a plumber for a side-bu-side fridge with water and ice dispenser?

I moved in this house 2 yrs ago and recently bought a new fridge to replace the old crappy 1970's looking one that was here. It is a GE side by side with ice and water dispenser on door. I thought I would need a plumber to run the water line but when I pulled it out to clean back there I notced I do have a water spicket back there. Do I still need a plumber? I am paying the $10 for the guys who move it in the hosue to hook it up but dont know if I need more then what is already there. What I saw was a square hole neatly cut into the wall behind fridge and a water spicket valve. Thanks!