Atlanta Police Maj. Michael O'Connor had previously stated in a news conference last month that Cunningham failed to obtain a promotion to branch manager and met with his supervisor to discuss the issue one week before he went missing.
The Washington Post was among the publications that reported on Timothy Cunningham allegedly going missing due to work-related issues, writing earlier this month that the CDC doctor vanished not long after he was told he wasn't going to get promoted.
However, in a statement released on Monday, acting CDC Director Dr. Anne Schuchat said that information was not accurate.
Police said Cunningham called his mother, who missed the call, and he didn't leave a voicemail, WGCL-TV reports.
In partnership with Crime Stoppers of Greater Atlanta, Cunningham's family increased the reward from $10,000 to $15,000 for any information that will help authorities land an arrest or indictment pertaining to Cunningham's disappearance.
The CDC said it would continue to work with the Atlanta police department to solve the mystery of Cunningham's disappearance.
His concerned parents found his wallet, vehicle and beloved pet all abandoned at Cunningham's Atlanta area home.
A reward for information about Cunningham has grown to more than $20,000. "If anyone reading this has information about the whereabouts of Commander Cunningham, please come forward". Over and above any of his assignments at CDC, his early promotion within the USPHS reflects his excellence as an officer and an employee.
"Dr. Cunningham's colleagues and friends at CDC hope that he is safe", agency spokeswoman Kathy Harben told The Post after his disappearance.
Adding even more mystery to the freakish case, Chris Torry, a neighbor of Cunningham's, told WAGA that the CDC employee made a odd request a few days before he disappeared.