Scott's assistant found her hanging by a scarf from her doorknob.
Jagger's rep said he joined his three of his seven children, Karis, Elizabeth and Georgia May, on the West Coast, with son David expected to arrive soon.
Together, they are said to be planning a memorial for the late designer.
"Privacy for him and his family during this very difficult time is requested," his rep said in a statement.
The 70-year-old rocker said in a statement on Tuesday that he was still coming to terms with Scott's death.
"I am still struggling to understand how my lover and best friend could end her life in this tragic way," he said.
"She had great presence and her talent was much admired, not least by me," he added. "I have been touched by the tributes that people have paid to her, and also the personal messages of support that I have received."