This may hurt. The planned expansion of insurance coverage under the health-care law could mean a shortfall of M.D.s in some parts of the country—and there’s not much we can do in the short term, experts say. But the problem isn’t new. Even without the Affordable Care Act, America was projected to be about 100,000 doctors short by 2025. Health-care experts have said that the new law will exacerbate the “invisible problem” of dwindling docs, arguing that while patients will still get the care they need, the process to do so will become more arduous.