The stark piano ballad, released with little fanfare on June 21, sees Lovato sing in brutal detail about her struggles with addiction. The cause, however, is unclear.
"Extra" has learned that the Los Angeles Police Department received the 911 call before noon on Tuesday.
A representative for Lovato did not immediately return a request for comment.
Lovato has been known to have substance abuse battles.
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The 25-year-old artist recently released a song called "Sober" about breaking about breaking her 6-year sobriety streak. "To the ones who never left me/We've been down this road before/I'm so sorry, I'm not sober anymore". She was due to play in Atlantic City on Thursday night (US Time), before taking a break until late September when she was due to being a two-month tour of Central and South America.
"I knew at a young age that some of my behaviours were a problem", she said, but added: "I wasn't in a place where I could quit by myself".
"I was scared as my mum always told me that your heart could just burst if you do it but I did it anyway and I loved it".
Following the reports, U.S. chatshow host Ellen DeGeneres tweeted: "I love @DDLovato so much".
Brad Paisley said he was praying for his "brave" and "honest" friend, calling addiction "a terrifying disease".
The New Mexico-born performer rose to fame on Disney Channel shows "Camp Rock" and "Sonny with a Chance" 10 years ago and forged a pop career with hits like "Skyscraper" and "Sorry Not Sorry".