One Long Island hospital scored an “A” and another scored a “D” in a national safety report that’s issued twice a year with an eye to improving health care quality and safety.

The “A” went to St. Francis Hospital, Roslyn, and is the organization’s ninth “A” since the report’s debut in 2012, with the string broken by a “C” last fall, according to The Leapfrog Group, a health quality organization, which on Monday released its fall 2016 safety grade findings.

Receiving the D was St. Joseph Hospital, Bethpage, this following a C in the spring and two Bs in 2015.

Of the 19 other Long Island hospitals assessed in the report, four received B’s, with the majority — 15 — getting C’s.

The report looked at 30 patient safety measures at 2,633 hospitals nationwide, assigning grades from A to F, based on practices ranging from staff hand-washing polices to the number of dangerous objects left inside patients.

“We are honored to be the only hospital on Long Island to receive an “A,” said Ruth E. Hennessey, St. Francis’ executive vice president and chief administrative officer. That, along with the long-term distinction, is a “testament” to “our compassionate and skilled healthcare team,” with the focus continually “on the pursuit of excellence and improving care for our patients.”

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As for St. Joseph and its D, the hospital “focuses on delivering high quality care and patient safety” and “has a robust performance improvement process and continually seeks new ways to deliver better care,” a spokeswoman said. Citing several awards, including ones for patient care and safety, she said that the hospital, through Catholic Health Services, is partnering with a strategic consulting organization in “a far reaching long-term effort . . . to minimize harm to and ensure the safety of our patients.”

The four hospitals in this fall’s “B” group are: Southampton Hospital; Eastern Long Island Hospital, Greenport; St. Charles Hospital, Port Jefferson; and St. Catherine of Siena Medical Center, Smithtown.

Nationally, 844 hospitals earned an “A;” 658, a “B;” 954, a “C;” 157, a “D;” and 20, an “F,” according to The Leapfrog Group, a national nonprofit founded in 2000 by large employers. There were no F’s on Long Island.

Stony Brook University Hospital, which had received an F in the spring report, was awarded a C this time, following mostly B’s since 2013.

The hospital “supports the public availability of quality and safety information about hospitals,” a spokeswoman said in a statement. “We are constantly looking for ways to improve, and to ensure that we are consistently offering the highest quality of care.”

Dropping to a C, following a string of nine consecutive A’s, was John T. Mather Memorial Hospital, Port Jefferson.

“Our recent rating of ‘C’ is a big disappointment,” said Stuart Vincent, director of public relations. “We are taking steps to understand the reasons behind our decreased rating and the measures we can take to improve our score,” he said. The “Mather family — leadership, staff and physicians — “can be counted on to work together to address the issues that impacted our score.”