The comedian was forced to leave The Howard Stern Show in December 2009 due to an alleged drug-related incident and a month later attempted to commit suicide.
Lange discussed his troubled past on Late Night with Jimmy Fallon, revealing that he only began to recover after spending several months in a Florida medical centre.
"I feel fantastic. I went to rehab. I had some issues that had to be dealt with in rehab. They have experts there, that deal with people like me… It was in South Florida," he explained to Jimmy Fallon.
The comic went on to say: "I went down there and I had a counsellor, she's a wonderful woman, 60 years old, very sweet. It's me and eight guys in the group… and the woman says, 'You know I think your drug use can be traced back to [your] lack of self-importance'."
Lange had previously entered rehab on several different occasions throughout his life, but told Fallon that he reached his first breakthrough during his 2010 stint.
"I finally got the idea of rehab, which is to stop doing drugs," he joked. "A lot of normal people, like you, think rehab is like white [lab] coats… It's not that way. It's people [that are] really concerned."
Lange is currently hosting a syndicated sports radio show with fellow comic Nick DiPaolo, which airs in several markets throughout the US.
> Howard Stern 'unsure of Artie Lange radio return'
Watch Artie Lange's appearance on Late Night with Jimmy Fallon below: