As he adjusted to incarceration, Bill Cosby spent his first four months in prison in a special unit, isolated from other inmates, out of concern for his safety at SCI Phoenix, a maximum-security facility outside Philadelphia.

But last week authorities moved him from so-called administrative segregation to join the general population at a wing that houses other inmates, according to the Pennsylvania Department of Corrections.

Amy Worden, a spokeswoman for the corrections department, said Mr. Cosby made the move on Jan. 28, though she would not specify the wing to which he was sent. Mr. Cosby’s spokesman, Andrew Wyatt, said the entertainer’s new single-person cell is in an area that only houses older inmates and that he did not view it as a “general population” unit. But Ms. Worden said that was not the case and that the prison does not have a special area reserved for older inmates.

Mr. Cosby — now inmate NN7687 — is among the most famous prisoners in America and his movements have been closely watched since he was sentenced last year in the assault of Andrea Constand at his home in 2004.