Doctors Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery. Find doctors and medical staff: Edit search filters close Narrow your search Doctor's Name, Condition Or Procedure By location Jacksonville, FL By last name There are no doctors whose last name begins with the letter A A Find a doctor whose last name begins with the letter B B There are no doctors whose last name begins with the letter C C active Find a doctor whose last name begins with the letter D D There are no doctors whose last name begins with the letter E E There are no doctors whose last name begins with the letter F F Find a doctor whose last name begins with the letter G G There are no doctors whose last name begins with the letter H H There are no doctors whose last name begins with the letter I I Find a doctor whose last name begins with the letter J J Find a doctor whose last name begins with the letter K K Find a doctor whose last name begins with the letter L L Find a doctor whose last name begins with the letter M M There are no doctors whose last name begins with the letter N N There are no doctors whose last name begins with the letter O O Find a doctor whose last name begins with the letter P P There are no doctors whose last name begins with the letter Q Q Find a doctor whose last name begins with the letter R R There are no doctors whose last name begins with the letter S S There are no doctors whose last name begins with the letter T T There are no doctors whose last name begins with the letter U U There are no doctors whose last name begins with the letter V V Find a doctor whose last name begins with the letter W W There are no doctors whose last name begins with the letter X X There are no doctors whose last name begins with the letter Y Y There are no doctors whose last name begins with the letter Z Z By conditions treated No results found By procedures performed No results found By spoken language No results found Reset all filters Search Tips Use quotes for phrases. Even if there are no auto-suggestions within the search field, hit "Search" anyway, as you may still get results. Displaying 1-1 out of 1 doctors available Last Name Initial: D Gregg S. Day, M.D. Neurologist Jacksonville, FL Areas of focus: Lumbar puncture, Autoimmune encephalopathy, Mild cognitive impairment, Dementia, Alzheimer's disease, Progressive supra...nuclear palsy, Frontotemporal dementia, Posterior cortical atrophy, Primary progressive aphasia, Encephalitis, Lewy body dementia, Creutzfeldt Jakob disease, Normal pressure hydrocephalus, Corticobasal syndrome, NMDA receptor antibody encephalitis, Wernicke-Korsakoff syndrome Show more areas of focus for Gregg S. Day, M.D. Request an appointment OverviewReferrals Sept. 12, 2023 Share on: FacebookTwitter Alzheimer's Disease Treatment ClinicSectionsOverviewDoctorsReferrals SectionsRequest an AppointmentOverviewDoctorsReferrals ORG-20545005 Medical Departments & Centers Alzheimer's Disease Treatment Clinic