Matt Rourke/AP

Cigna has lost roughly a half billion dollars tied to federal sanctions against its Medicare Advantage plans, according to people familiar with the matter.

The $500 million deficit represents the money Cigna has spent fixing problems with its Medicare Advantage plans, as well as the value of the thousands of members Cigna has lost during Medicare's enrollment period for this year. In 2015, Cigna collected $6.1 billion in Medicare Advantage revenue from the federal government.

Background: The Centers for Medicare and Medicaid Services levied sanctions on Cigna last January after discovering its Medicare Advantage plans had major deficiencies — such as inappropriately denying care and prescription drugs. As a penalty, Cigna was banned from marketing or enrolling people into its Medicare Advantage plans and ordered to clean up its act.

There still is no timeline for when Cigna will remedy all of its problems. Cigna didn't respond to requests for comment.

Why it matters: Medicare Advantage, the private version of Medicare that has encountered many problems over the years, is expected to grow heavily in the coming years regardless of what happens to Obamacare because it has garnered bipartisan support. This kind of financial loss in a vital business could set back Cigna, especially if its deal with Anthem is nixed.

It could have been worse: Last March, the federal government quietly spared Cigna from losing up to $350 million in Medicare Advantage bonuses.

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Why it matters: Trump appears to have backed off his threat to immediately ban TikTok after speaking with Microsoft CEO Satya Nadella, who said Sunday that the company will pursue discussions with TikTok’s Chinese parent company ByteDance to purchase the app in the U.S.

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Filing suggests Manhattan DA is investigating Trump for possible fraud

Photo: Brendan Smialowski/AFP

The Manhattan District Attorney's office suggested for the first time Monday that it's investigating President Trump and his company for "alleged bank and insurance fraud," the New York Times first reported.

The state of play: The disclosure was made in a filing in federal court that seeks to force accounting firm Mazars USA to comply with a subpoena for eight years of Trump's personal and corporate tax returns.