Mingma Sherpa of expedition organizer Seven Summits Treks said Kami Rita reached the 8,849-meter summit at 7:25 a.m. local time on Sunday with other climbers.
Rita is reported to be in good health and is already on his way to the lower camps.
Kami Rita climbed Mount Everest twice last year, breaking the record for the most number of ascents to the summit the first time, and bettering it less than a week later.
Rita and fellow 'Sherpa' Pasang Dawa are vying for the title of having climbed the world's highest peak the most times. Pasang Dawa has 27 successful ascents of the mountain.
Kami Rita first climbed Everest in 1994 and has made the journey almost every year since.
The expertise and skills of the Sherpas are vital to the safety and success of the foreign climbers who attempt to summit the mountain each year.
Rita's father was among the first Sherpa guides. In addition to climbing Everest, Kami Rita has climbed many other peaks, including K2, Cho Oyu, Manaslu and Lhotse, which are among the highest in the world.
Mingma Sherpa said the weather on the mountain was favorable for climbing to the summit.
The first group of climbers this year reached the summit of Everest just a few days ago and there are hundreds more who will attempt to climb the mountain this month.
Local Sherpa guides will accompany the climbers throughout the climbing season.
