Mailing Address: Louisiana Department of Health | P. O. Box 629 | Baton Rouge, LA 70821-0629 Physical Address: 628 N. 4th Street | Baton Rouge, LA 70802 | PHONE: 225-342-9500 | FAX: 225-342-5568 Medicaid Customer Service 1-888-342-6207 | Healthy Louisiana 1-855-229-6848.