Some 15,000 New York nurses will strike at the city’s major privately-run hospitals Monday unless there’s a last-minute new union contract or break in lengthy and personal labor dispute.

The New York State Nurse Association will strike at hospitals including NY Presbyterian, Mount Sinai and Montefiore medical after testy negotiations and an apparent impasse over salaries and benefits, including medical coverage and staffing levels.

“The greedy CEOs are putting the nurses on strike,” union president Nancy Hagan said during a virtual briefing to reporters, accusing hospital bigwigs of being “missing in actions” as talks have dragged on.

Hospital officials said they have prepared strike contingency plans to continue medical appointments and care.

“While we know a strike can be disruptive, we are prepared for a strike that could last an indefinite amount of time and have taken every step to best support our patients and employees in the event NYSNA forces our nurses to walk away from the bedside for the second time in three years,” a Mount Sinai spokesperson said.

Mount Sinai said it has hired more than 1,000 nurses across its three hospitals.

“We expect most appointments will proceed as originally scheduled,” the statement said. “There has been tremendous coordination across our entire network to manage discharges and ensure that we are prepared for the start of the strike and able to increase our capacity if a potential strike drags on.”

Gov. Kathy Hochul declared a “disaster emergency” in Manhattan, The Bronx and Nassau counties, citing a record number of flu cases and hospitalizations, coupled with the pending strike.

Mount Sinai CEO Brendan Carr said the emergency declaration gives the hospitals greater flexibility to manage staff disruptions during the strike, including leeway on using out-of-state providers and transferring patients to other hospitals.

 “There are patients who need our services, and I’m optimistic that after a few days of transition, we will be able to use our alternative staffing solution to fulfill our obligation to our patients to provide quality health care for the duration of any strike,” Carr said in a note to staff.

He was not optimistic the strike would end quickly.

“The list of items left to resolve is long. Beyond wages and compensation, NYSNA includes proposals to change vacation/PTO, staffing models, and shift differentials,” Carr said. “All have significant costs both operationally and economically, and they will need to be resolved in addition to agreeing on base wage increases.”

NYSNA, in an advisory issued Sunday morning, said the strike will begin at 6 a.m. Monday at Mount Sinai Hospital and Mount Sinai Morningside and West facilities – and at 7 a.m. at Montefiore, and NewYork-Presbyterian hospitals.

Key sticking points in negotiations, according to NYSNA, include management’s threats to cut healthcare benefits for frontline nurses, and rolling back safe staffing standards the union secured when its nurses went on strike at two major hospitals three years ago.

The union also claimed hospital management has refused to agree to protections from workplace violence.

It cited an incident last week at Brooklyn Methodist hospital, where a bloodied, blade-wielding patient was shot and killed by cops after he barricaded himself in a room with an elderly patient and a staffer — sending the Park Slope medical center into lockdown.

But hospital officials claim the union has submitted outlandish salary demands and rejected proposed safety improvements.

“NYSNA leadership’s reckless and irresponsible demands totaling $3.6 billion, including a nearly 40% wage increase, and taking issue with our reasonable measures like rolling out panic buttons for frontline staff in the Emergency Department, clearly put patients at risk,” said Joe Solmonese, Montefiore’s senior vice president for strategic communications.

“We are preparing for what we anticipate could be a multi-week strike, and are resolute in devoting whatever resources are necessary to safe and seamless care for our community.”

NYSNA claimed its members are not asking for outrageous wage demands.

It said Northwell’s Plainview, Syosset and Huntington hospital nurses signed tentative agreements on new contracts on Friday that included 5% annual increases over three years and maintained good benefits and bolstered safety standards.

Mayor Zohran Mamdani issued a statement on his X account Sunday night saying his office and the city’s Emergencency Management team, FDNY, the Health Department and public hospital system are closely monitoring the strike.

 He said he was relieved that most other hospitals  have reached agreement with NYSNA and urged the parties to “stay at the table and reach a deal that both honors our nurses and keeps our hospitals open.”

“The safety and wellbeing of this city is my top priority and ensuring New Yorkers have the care they need is critical, especially during flu season,”  he said.

“No New Yorker should have to fear losing access to health care — and no nurse should be asked to accept less pay, fewer benefits or less dignity for doing lifesaving work. Our nurses kept this city alive through its hardest moments. Their value is not negotiable.”

NYSNA endorsed Mamdani in the general election for mayor, just days after he defeated Andrew Cuomo in the Democratic primary.