Ascension St. John Hospital. Emergency Care; Hospital/Medical Center; Imaging; Laboratory; Primary Care/Clinic; Specialty Care; Address. 22101 Moross Rd Detroit, MI 48236. Phone. 313-343-4000 Departments. Birthing Center. Hours 24 hours . Phone 313-343-4000. ... your personalized and confidential patient portal provided by Ascension in ....