Both Mick, 41, and Andrew were rushed to a Des Moined hospital on Wednesday morning, reported Ace Showbiz.
Slipknot's lead vocalist Corey Taylor did his own investigation after hearing the news and gave update to fans on Twitter.
"In regards to the story about Mick, I'm doing the best I can to find out if he's alright. I'll get back to you later," Corey wrote, before adding, "Mick Update: from what I've heard he's okay. We're sending him all your thoughts. Thank you for that."
When cops arrived at the scene, they found Mick and Andrew, both apparently drunk, with "serious but not life-threatening life wounds." They were taken to hospital in separate ambulances.
Slipknot has upcoming "Prepare for Hell Tour" with Hatebreed in Fort Meyers, Florida on April 25.
The band also has a major headlining tour called "Summer's Last Stand" which is scheduled to kick off July 24 in West Palm Beach, Florida.