Michael Mirotznik, chairman of the Nassau University Medical Center board, resigned his volunteer post Friday afternoon, effective immediately, county and hospital officials confirmed.

Mirotznik, a Bellmore attorney, did not give a reason for his resignation. He could not be reached for comment.

“It was a surprise letter, but he’s always been a dedicated board member for many years,” said NUMC spokesman Todd Shapiro. “We wish him the best for his service to the people of Nassau County.”

County Executive Laura Curran, a Democrat, has the authority to appoint Mirotznik’s replacement to head the 15-member board of directors for the public benefit corporation that runs the East Meadow hospital and associated facilities. Her appointment does not need confirmation by the county legislature.

Curran spokesman Michael Martino said, “The county executive accepted his resignation and will move forward to find a well-qualified candidate to put that hospital on track.”

Mirotznik had been appointed by former Republican Nassau County Executive Edward Mangano in 2014.

Board member Bobby Kumar Kalotee, a former chairman who was reappointed to the board last year, said he wished Mirotznik well.

“He did his best under the best or worst circumstances. Now it’s up to the county executive to appoint whomever she wants. Hopefully she chooses me,” Kalotee said. “If she chooses me it will be an honor for me to serve for her.”

During her county executive campaign, Curran last year bashed the Nassau Health Care Corp. for patronage hiring and a lack of transparency, calling it “another symbol of the culture of corruption.”

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