WASHINGTON — Investigators identified 1,700 veterans awaiting medical care at the Phoenix VA hospital but not on an official waiting list and an average wait of 115 days for a first appointment for those who were listed, the Veterans Affairs Department’s inspector general said Wednesday.

The IG concluded that “inappropriate scheduling practices are systemic throughout” the nationwide VA health care system.

Rep. Jeff Miller, R-Fla., chairman of the House Veterans Affairs Committee, and Sen. John McCain, R-Ariz., immediately called for VA Secretary Eric Shinseki to resign. Miller also said Attorney General Eric Holder should launch a criminal investigation into the VA.

Richard J. Griffin, the department’s acting inspector general, said in an interim report that investigators had “substantiated serious conditions” at the Phoenix VA hospital.

“While our work is not complete, we have substantiated that significant delays in access to care negatively impacted the quality of care at this medical facility,” he wrote in the 35-page report.

Miller said the report confirmed that “wait time schemes and data manipulation are systemic throughout VA and are putting veterans at risk in Phoenix and across the country.”

Griffin said his office has increased the number of VA health care facilities it is investigating to 42 nationwide, up from 26 known to be under investigation as of last week.