The 31-year-old was rested during the recent NatWest ODI series against India after playing a part in the 4-0 Test series whitewash.
Despite his omission, Pietersen is back with the squad on their current tour of India.
"I don't know how many times I need to say it till you stop asking the questions," he told Sky Sports News. "I want to continue playing until the 2015 World Cup, and then we'll reassess.
"Look, I want to play all three forms of the game for England, I've said that many times.
"It's a case of, when England are playing international cricket, I want to be there."
England begin their series against India in Hyderabad on Friday, October 14.