Is sex reassignment surgery medically necessary enough to force the public to pay for prisoners to have it?

A Federal judge ordered that the Commonwealth of Massachusetts has to provide such surgery for a murderer. It is cruel and unusual punishment not to treat the prisoner’s gender identity disorder with surgery.

Is gender reassignment medically necessary? Is gender identity disorder real? Are prisoners entitled to this treatment, especially when so many prisoners don’t get treated for far easier-to-treat and more deadly conditions? Should the government have to pay for this surgery since the prisoner is in governmental custody?