Nassau University Medical Center’s CEO was abruptly booted in the first board meeting since New York state effectively took control of the hospital through Gov. Kathy Hochul’s budget deal.

CEO Meg Ryan planned to stay on until July 20 to help with the transition, but was removed on the spot and placed on administrative leave Tuesday night by the hospital’s new state-appointed board of directors.

“This evening’s actions reflect our commitment to restoring stability and building a successful future for this essential public hospital,” Stuart Rabinowitz, the hospital’s newly appointed board chair said in a statement.

The board replaced Ryan with Northwell Health executive Richard Becker for the interim, and also agreed to bring in three outside firms to help steer the hospital through the transition.

Manatt, Phelps & Phillips was hired as legal counsel, Deloitte brought on to handle the finances and operations, and Korn Ferry to find a new permanent CEO.

Ryan declined comment to The Post.

Ten hospital execs including Ryan announced over the last two weeks that they’d resign in July.

Nassau Executive Bruce Blakeman announced he and the GOP majority in the county legislature would not be making their designated picks to the newly-formatted board out of protest — and instead would be naming Hochul in the lawsuit to overturn the “illegal takeover.”

“[New York State] has made it very clear that they do not want me to be in the CEO role,” Ryan told The Post after she made the decision to step down.

Two weeks ago, she and other executives predicted that the power balance will completely shift, pointing out that seven out of the 11 board members are being hand-picked by the state.

The five-member Nassau County Interim Finance Authority, which monitors and oversees the county’s finances, unanimously voted last week to impose a “control period” of overseeing NUMC spending.

That means that every major contract the hospital enters now needs the fiscal watchdog’s sign-off.

“This is a mandatory requirement,” NIFA chair Richard Kessel explained ahead of the June 2 vote.

“It’s not something that’s optional. The numbers that have been presented here tonight automatically trigger the imposition of a control period.”

He explained that under the new state budget, NIFA is now required to intervene if the hospital runs an operating deficit above 1%.

NUMC posted an 11% shortfall in 2023 — roughly $77 million — which ballooned to $83 million last year, which he said has no sign of slowing down.

However, Ryan and other NUMC leaders have said they’ve turned around the fiscal disaster since new leadership under Blakeman took the reins and is now on track to profit $11 million this year without cutting any jobs or departments — despite being in the hole hundreds of millions of dollars just a few years ago.