Hi there-
Provided you are in good health, and you have chosen an experienced and quality plastic surgeon certified by The American Board of Plastic Surgery, you should be able to have your tummy tuck as an outpatient.
Whether this occurs in a hospital, an outpatient surgery center, or an office based surgery center will depend on your surgeon's preferences and your state of health.
You can be confident, however, that as long as your surgeon is, in fact, certified by The American Board of Plastic Surgery and is a member of The American Society of Plastic Surgeons, that whatever facility he or she operates at has been certified by a national accreditation organization, as this is a requirement of membership in these organizations (another reason to be sure to ask about these credentials!).