Representatives from Ichilov Hospital in Tel Aviv confirmed on Sunday evening that it treated Hamas leader Ismail Haniyeh's daughter.
The hospital said that Haniyeh's daughter had been admitted for a number of days, noting that she was one of over a thousand Gazans that the hospital treats every year.
Haniyeh's daughter was admitted for emergency medical treatment after she suffered complications from a routine procedure, two sources familiar with the case said.
Haniyeh, who has 13 children, is the leader of the Islamist group in Gaza and one of its most senior figures overall, serving as a deputy to Khaled Meshaal, who lives in exile.
Two sources - one Palestinian and the other a foreign diplomat with knowledge of the case - declined to name the daughter and, out of respect for her privacy, asked that details of her condition not be published.
Like many Hamas officials, Haniyeh spent the seven-week-long war largely in hiding. His home in the northern part of the Gaza Strip was destroyed by an Israeli air strike.
An Israeli official said he could not discuss specific medical admissions from Gaza.
But he said that in most cases a request by a Palestinian doctor to allow a patient across the border for urgent treatment was sufficient - indicating Haniyeh may not have been personally involved in his daughter's application.
During the war and since it ended in late August, dozens of patients from Gaza have been brought to hospitals in Israel, where the resources and technology for advanced treatment and complicated operations are vastly better.
Hamas is sworn to Israel's destruction but has voiced openness to a long-term truce and a measure of cooperation with Israel which, along with neighboring Egypt, controls access to the coastal enclave, home to 1.8 million Palestinians.
Israeli media has reported that one of Haniyeh's granddaughter's was treated in an Israeli hospital last November, while his mother-in-law sought treatment in a Jerusalem hospital in June.