Final answer:
Pyloric stenosis is the gastrointestinal disease (GI dz) that has stacked coins on x-ray. It is a condition where there is a narrowing of the pylorus, causing characteristic appearance on an x-ray.
Step-by-step explanation:
The gastrointestinal disease (GI dz) that has stacked coins on x-ray is called pyloric stenosis. Pyloric stenosis is a condition where there is a narrowing of the pylorus, which is the opening from the stomach to the small intestine. This narrowing can cause a characteristic appearance on an x-ray, referred to as the 'double-track' or 'stacked-coin' sign.