The former president was discharged on Sunday and he is experiencing no complications or further damage, said Jim McGrath, Bush's spokesman.
"A very grateful President GeorgeHWBush was discharged from @MaineMed after four days of treatment for a fractured vertebrae," McGrath said on Twitter.
Bush, 91, broke his C2 vertebrae after falling at his home and spent four days in a hospital in Portland. He will have to wear a neck brace till complete recovery.
Bush suffers from a form of Parkinson's that makes impossible to walk and he moves around in a wheelchair.