"The Medical Examiner has determined her cause of death was an accident caused by blunt impact injuries to her torso," the OCME said in a statement.
"Having released this determination, OCME will not comment further on the investigation."
It has not yet been revealed exactly what time Ms Trump passed away.
Former US President Donald Trump announced his ex-wife’s death via a post on Truth Social on Thursday.
"I am very saddened to inform all of those that loved her, of which there are many, that Ivana Trump has passed away at her home in New York City," he said.
The pair married back in 1977 before having three children together and divorcing in 1992.
Ms Trump was found unconscious at the bottom of the stairs in her Manhattan Upper East Side home.
A call was placed to emergency services at around 12:40PM before paramedics arrived and pronounced Ms Trump dead at the scene.
Stay up-to-date on the latest news with Your Morning Agenda - supported by a network of local journalists from all major Australian cities, ensuing timely and first hand insights on local stories:
Download LiSTNR and enjoy a new world of audio. All your favourite shows and stations in one library.