Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Centene (NYSE: CNC) fell 12% to begin trading today, but recovered some of that loss and is now down just 6%.

So what: Georgia said it was going to double check Medicaid records for overpayments, and AMERIGROUP (NYSE: AGP) said it would take a $0.16 per share charge. The state found it had double paid some insurers and it would be looking for money back for those over payments.

Now what: It seems a little odd that neither insurers nor anyone in the government knew that these double payments were happening. What should be good for taxpayers is a drag for investors today, and who knows exactly what the impact will be. For now it’s a big unknown but a number of insurers have been dragged lower today and I’m leery of buying on the dip.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.