Richard Bailey alleges he was behind the spoof Twitter account - KP Genius - sending up Pietersen's personality in the third person, which was closed down after the England batsman was perturbed some of his team-mates followed it.
"Following last night's statement by Mr Richard Bailey that he was responsible for creating a parody Twitter account in Kevin Pietersen's name, I would like to confirm that I had no involvement in this whatsoever," Broad said in an England and Wales Cricket Board statement.
The parody account was closed down last week and Bailey, who says he is from Nottingham and is better known by his handle of @Bailsthebadger, has apologised for any offence caused and exonerated any professional cricketers from involvement.
Yet his friendship with Broad has been brought into question, prompting the 26-year-old to respond.
Broad added: "I met with the Managing Director, England Cricket, Hugh Morris this morning and assured him that I did not play any role in the creation of this account or provide Mr Bailey with any information regarding Kevin Pietersen or the England team.
"As has been widely reported Mr Bailey is a friend of mine, but we had no conversations regarding this issue at all and I am pleased that he has now decided to close the parody account down."
Morris added: "Having discussed this matter with Stuart, I am fully satisfied that he acted in a professional manner at all times and did not breach any confidences regarding fellow England players.
"ECB also accepts the apology Mr Bailey offered last night to the England team via his Twitter account and his reassurances that no professional cricketers were involved in the creation of this site."