CVS announced last month that it plans to buy Signify Health, the nation's largest provider of home health risk assessments. The deal would represent the Aetna parent company's first foray into the lucrative home health market, an area in which rival Medicare Advantage carriers UnitedHealthcare and Humana already have a foothold. CVS has also indicated that it is in the market for a primary care provider. The Justice Department request extends the amount of time CVS Health and Signify Health must wait to consummate the deal by 30 days, although the government could waive that requirement. CVS still expects to close the transaction in the first half of next year, according to documents filed to the Securities & Exchange Commission on Thursday. Neither company immediately responded to interview requests, Crain's sister publication Modern Healthcare reports.