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: Shareholders of revenue cycle management services company Accretive Health (NYSE: AH) are finding themselves in need of a hospital today after their stock tumbled 28% in response to comments from Minnesota's attorney general.

So what: In late March, Accretive Health agreed to no longer collect debt on behalf of Fairview Health Services in response to this same lawsuit. Today's news widens the scope of that investigation beyond just Fairview, and the allegations made by the attorney general contend that Accretive's employees didn't properly disclose their roles to patients and that they attempted, in some cases, to collect from patients prior to them even receiving care. Further, it appears that Fairview Health's tax-exempt status may be in jeopardy because of Accretive's aggressive debt-collecting tactics.

Now what: Last month when Accretive announced the loss of the Fairview account, it shaved about 6% of its revenue off its full-year forecast. With the scope of this investigation expanding, it's quite possible the impact to Accretive's bottom line may expand as well. At some point Accretive will be worth a look, but even after today's drop, 14 times forward earnings is still too much to pay with so many questions still on the table.

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