Gerard B Chamberlin MD MPH PC. 6242 East Arbor Avenue, Suite 123. Mesa, AZ 85206. Get Directions. 480-930-4600. 480-930-4615. 2. Banner Casa Grande Medical Center. 1800 East Florence Boulevard. Casa Grande, AZ 85122. Get Directions. 520-381-6300. 520-381-6435. 3. Banner Hospitalists at Banner Baywood Medical Center..