The accused, identified as K Purnachandra Rao (21), allegedly sexually assaulted the girl when she was carrying food for her uncle in K P Palem village yesterday, they said.
Police said Rao, riding a two-wheeler, knocked the victim down before taking her to a deserted field where he raped her.
Meanwhile, the victim was today shifted to Kakinada hospital as the village hospital did not have a gynaecologist, they said.
"The girl's condition is stable and we are conducting medical tests on her", said a doctor at the hospital.