"Musíme se dostat k lékaři."

Translation: We must get to the doctor.

[JohnBraga1]

the more natural English answer is "we must get to the doctor's"

[Chrobie]

It actually isn't (http://bit.ly/2Fz8NlK), but you are right in saying that "to the doctor's" should probably also be accepted.

[chartsman]

Is it dative?

[BoneheadBass]

It is.