Medicare Advantage provides health coverage to more than half of the nation’s seniors, but a growing number of hospitals and health systems nationwide are pushing back and dropping some or all contracts with the private plans altogether.

Editor’s note: This article was originally published Sept. 27. It was updated Nov. 14 to reflect new contract developments between hospitals and Medicare Advantage plans, which are listed below.

Among the most commonly cited reasons are excessive prior authorization denial rates and slow payments from insurers. Some systems have noted that most MA carriers have faced allegations of billing fraud from the federal government and are being probed by lawmakers over their high denial rates.

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