A CUNY professor has helped potentially thousands of New Yorkers get medical jobs, including work in city hospitals, using fake medical certificates and phony adult-education classes, prosecutors claimed on Friday.

Mamdouh Abdel-Sayed, a tenured lecturer at CUNY’s Medgar Evers College in Brooklyn, was arrested Friday and charged with hosting “unauthorized courses” on important medical procedures, including CPR, sonography and phlebotomy, the practice of drawing blood.

In exchange, the Kearny, NJ, resident allegedly sold students fake course certificates — for as much as $1,000 a pop — which he said were backed by Medgar Evers.

The biology professor made the certificates “using paper and paraphernalia he purchased from an office supply store,” according to Manhattan federal prosecutors and the US Department of Education’s Office of the Inspector General.

Adbel-Sayed, 68, was released on $100,000 bond Friday afternoon and ordered to stop running his allegedly sham classes. He declined to comment outside court.

He faces as much as 80 years in prison if convicted on five counts, including solicitation of bribes, wire fraud and obstruction of justice.

Abdel-Sayed’s courses seemed real because he held them on Medgar Evers’ campus — usually at night or on weekends, feds said.

The courses included no textbooks and students were not graded. Abdel-Sayed even sold his certificates to students who bailed on his courses, the feds said.

Abdel-Sayed also put students at risk with his “unsanitary and risky procedures,” including telling students in the phlebotomy class that they should “attempt to draw blood from each other,” according to the complaint.

Prosecutors warned that Abdel-Sayed may have sold thousands of phony certificates over the years.

He then vouched for the fraud certificates to employers and a Manhattan staffing agency, the feds said.

Several of his students landed jobs in city hospitals as a result, according to the complaint.

“Abdel-Sayed, out of greed, put public health at risk,” said Acting Manhattan US Attorney Joon Kim.

A representative for CUNY didn’t immediately respond to a request for comment.