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The experienced team at Primary Care Plus – O’Neal brings you quality primary care medicine, as well as a wide range of specialized services. We are committed to providing you with the comprehensive care you deserve.

Same Day or Next Day Appointments Available for Current Patients

Office Hours:

7:00 a.m. to 4:30 p.m.
Monday through Thursday

7:00 a.m. to 2:30 p.m.

4710 O’Neal Lane
Baton Rouge, LA 70817


Patient Forms

Download and fill out PDF forms prior to your visit.

our Providers

Michael Guarisco, M.D.

Internal Medicine
Dr. Michael Guarisco earned a Doctor of Medicine from Louisiana State University Medical Center in New Orleans. He then completed internship and residency in internal medicine, and a fellowship in Emergency Medicine and Internal Medicine at the Mayo Clinic in Rochester, MN. Dr. Guarisco worked as an internist, then Section Head, and finally Chairman for the Division of Primary Care for the Ochsner Clinic Foundation in Baton Rouge. Since 2004, Dr. Guarisco has worked as a practicing physician at Primary Care Plus and has served as Medical Director since 2006. Dr. Guarisco is board certified in internal medicine and serves as a Diplomat for the American Board of Internal Medicine. He is affiliated with Baton Rouge General Medical Center, Our Lady of the Lake Regional Medical Center and Ochsner Medical Center – Baton Rouge.

Phillip H. Ehlers, M.D.

Dr. EhlersFamily Medicine

Dr. Phillip Ehlers earned a bachelor’s degree from Louisiana State University and a Doctor of Medicine from St. George’s University School of Medicine. He completed a residency in family medicine through the Louisiana State University Health Sciences Center in Lake Charles. 

Dr. Ehlers is the associate medical director for Primary Care Plus and practices at the Baton Rouge – O’Neal and Hammond clinics. He also serves as the medical director for Gentiva Hospice, based in Prairieville. As a physician, Dr. Ehlers has experience with family medicine, emergency medicine, urgent care and hospice care. 

Dr. Ehlers is certified in advanced cardiovascular life support and pediatric advanced life support. He is a member of the Royal College of Physicians, the American Academy of Family Physicians and the Louisiana Academy of Family Physicians.

Saman Jayasinghe, M.D.

Family Medicine
Dr. Saman Jayasinghe earned a Doctor of Medicine from the Royal College of Surgeons in Ireland, then completed a residency at the Tulane University School
of Medicine in New Orleans. Dr. Jayasinghe also has a Master of Public Health in health policy and management from the Rollins School of Public Health at Emory University in Atlanta, Georgia.

Prior to joining Primary Care Plus, Dr. Jayasinghe served as a physician with AbsoluteCare, Southeast Community Health Systems and Ochsner Health. He is board certified in public health and general preventive medicine, and he is a member of the Louisiana State Medical Society, the American College of Preventive Medicine, and the American College of Occupational and Environmental Medicine.

Cynthia Tillman, MSN, FNP-C

Family Medicine
Cynthia Tillman is a nurse practitioner who specializes in family medicine. She has a background in a variety of areas, including geriatric care, retail health, primary care and emergency room trauma nursing. She earned a Bachelor of Science in Nursing from Louisiana State University Health Sciences Center New Orleans in 2001 and a Master of Science in Nursing in family practice from Loyola University New Orleans in 2011.

Cynthia has been a board-certified family nurse practitioner since 2011.

We offer a wide range of healthcare services

Primary Care Plus – O’Neal offers convenient appointments for primary care, including routine physicals, immunizations, and treatment for illness and injury. We also offer specialized services, including:
  • Internal medicine
  • Diagnostics, including:
    • Electrocardiography (EKG)
    • Lab tests
    • Spirometry

We accept most insurance plans. Call us for more information.