Phone. Gerard B Chamberlin MD MPH PC. 6242 East Arbor Avenue, Suite 123, Mesa, AZ 85206 (Map) 480-930-4600. Banner Casa Grande Medical Center. 1800 East Florence Boulevard, Casa Grande, AZ 85122 (Map) 520-381-6300. Banner Hospitalists at Banner Baywood Medical Center. 6644 East Baywood Avenue, Mesa, AZ 85206 (Map).