The VA Medical Center in Wilmington has also been flagged for further review, the source said.
It's not known how many other facilities nationwide will face more investigation, or what exactly triggered it. The report is expected to clear some facilities while marking others for added examination, the source said.
It follows claims of cover-ups over wait times for treatment at possibly dozens of VA sites. The scandal has already prompted the resignation of VA Secretary Eric K. Shinseki and an audit of the agency's 152 medical centers.
Acting VA Secretary Sloan Gibson - speaking Thursday at the Phoenix VA, where accusations of secret wait lists used to hide delays ignited the scandal - said the data would show "the extent of the systematic problems" uncovered.
VA spokesman Randal Noller confirmed Friday the audit results would be released Monday but said he couldn't comment further.
Officials at the Philadelphia and Wilmington medical centers said Friday they had not been given results of the review.
Members of Pennsylvania's federal delegation have been pushing for answers and increased accountability at the VA for weeks, but the investigation has been kept under tight wraps.
Sen. Pat Toomey, a Republican, proposed a bill last month that would allow veterans to sue VA employees who falsified health records. Sen. Bob Casey, a Democrat, urged a "swift" response if wrongdoing was confirmed.
Rep. Bob Brady, a Philadelphia Democrat, said Thursday he knew a review of the city's medical center had been ordered but did not know why. "They're on the list to investigate," Brady said. "Hopefully, it's OK."
Brady said he had never heard complaints about wait times at the Philadelphia facility but expressed outrage at the scandal. "It's disgraceful, and we're going to push as hard as we can" to fix it, he said.
A partial audit released last week noted a "lack of integrity" at some facilities nationwide and said employees went to great lengths to hide common delays.
At 62 percent of the 138 medical centers reviewed, appointment dates had been altered at least once, according to the audit the White House ordered.
Among the 2,100 scheduling staff interviewed, 13 percent said they had been instructed to misrepresent wait times and between 7 percent and 8 percent admitted using alternatives to the standard wait list, the report said.
The VA's Office of Inspector general is conducting a separate review of 42 facilities. Though it's long been rumored that one Pennsylvania medical center was among that group, officials have declined to release the list, saying it would harm their investigation.
Coatesville spokeswoman Kathleen Pomorski said officials there did not believe the center was one of the 42 being investigated by the inspector general.
Rep. Chaka Fattah, a Philadelphia Democrat whose district includes the Philadelphia medical center, said he hadn't heard results of the VA audit but praised the local site.
On a Valentine's Day visit, Fattah said, he heard "nothing but rave reviews" from patients there. He added, though, that great care inside doesn't help if veterans are forced to endure drawn-out waits to be seen.
Fattah welcomed reviews of any VA facilities. "The fact that a location is being reviewed does not suggest there's something wrong," he said.
But the political fallout continues.
The House Committee on Veterans' Affairs is scheduled to hold a hearing Monday evening on data manipulation at VA facilities.
Under pressure to respond to the scandal, two U.S. senators on Thursday announced a sweeping bipartisan bill that would provide money to hire more health-care professionals, allow for the immediate firing of high-level officials tied to the delays, and let some veterans receive care outside the VA system.
The two sponsors - Senate Veterans' Affairs Committee Chairman Bernie Sanders (I., Vermont) and Sen. John McCain (R., Ariz.) - said the bill was imperfect but a significant step forward.
The House had already passed several of the measures.
Inquirer reporter Stacey Burling contributed to this article.