More and more medical practices across the country are rebranding themselves as urgent care centers. Their proliferation is skyrocketing, almost unheard of two decades ago. They sound like places promising the kind of medical attention offered at emergency rooms. But they don't. They are unregulated in New York and most other states; in New York, they are combating any effort at more oversight. For patients who go expecting emergency room-like care, there are concerns. There can result is delay in needed care, lack of equipment to do vital tests, and even fatal results. There is also a dark economic underbelly harming hospitals that actually do emergency work.