The saying I've adopted is that a company needs to have a lot of debt to make the stock go to zero. The maturity schedule of their debt needs to be outlined in SEC filings, so look for companies with a high debt-to-tangible equity ratio, especially where a significant portion of that debt comes due in the next year or two. Not sure if there's a quick screen, but hopefully that gives you a framework.

As for healthcare, Jim Chanos (who runs the largest dedicated short fund) has said that lots of the medical device and pharma companies are going to have their margins squeezed to help reign in on healthcare costs. It might take longer to develop, but again, something to consider.