Contract Collapse: Long Island’s Mount Sinai Physicians Officially Out-of-Network

Caught in the Crossfire: Mount Sinai & Anthem Split Leaves Thousands in Limbo

It’s the kind of letter nobody wants to open. Especially not right after ringing in the new year.

For thousands of Long Island residents, 2026 kicked off with a massive headache. Not a hangover. An insurance nightmare. The contract between Mount Sinai Health System and Anthem Blue Cross Blue Shield has officially hit a wall. Negotiations collapsed. And now, patients are stuck in the middle.

Confused? You’re not alone. Let’s break it down.

The Breakdown: What Actually Happened?

It started quietly enough. Contracts expire all the time. Usually, they get renewed. But this time? Deadlock…

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