Dr. Dianne Dekeyser, MD

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Address

841 Prudential Drive Suite 1100 Jacksonville, FL 32207

Phone

904-328-7379

Hours

• Monday: Closed
• Tuesday: 9:00 AM – 3:00 PM
• Wednesday: 9:00 AM – 3:00 PM
• Thursday: 9:00 AM – 3:00 PM
• Friday: Closed
• Saturday: Closed
• Sunday: Closed

Insurances Accepted

Aetna
AHCCCS
AmeriBen
Champ VA
Carelon
Cigna
ComPsych
Contigo Health
DMBA
Devoted Health
EMI Health
The Holman Group
Humana
Magellan Health
Medicare
Meritain Health
Optum
Tricare
TriWest CCN
United Healthcare
University Health Plans
Uprise Health

Dr. Dianne DeKeyser, MD

Psychiatrist

About Andrew Nichols, NP

Andrew Nichols, NP has over 10 years of healthcare experience spanning both military and civilian nursing. Born and raised in Houston, Texas, Andrew brings a sense of community to everything he does, and that same grounded, personal care carries into every patient interaction at Serenity.

Education and Background

Andrew earned his advanced practice degree from Texas State University and pursued specialized training in psychiatric mental health care. He served as a Lieutenant in the U.S. Navy, working as a Critical Care and En Route Care Nurse at Naval Hospital Okinawa and with the 3d Medical Battalion.
He joined Serenity drawn by the practice’s commitment to interventional treatments, including TMS and ketamine therapy, that go beyond conventional options to offer patients real, evidence-based paths forward.

Care Philosophy

Andrew approaches each session by staying present and grounded during even the most difficult moments. He meets every patient with understanding rather than judgment, and with care that is guided by clarity, honesty, and a genuine belief that treatment works best as a collaborative process.

What to Expect

In your first visit, Andrew will take time to understand what has been going on and what matters most to you before anything else. From there, you will build a plan together, one that feels manageable and effective. He listens closely and makes sure nothing important gets missed.

Personal Interests

When Andrew is not with patients, you will likely find him at the gym, reading a book, or practicing mindfulness. His greatest joy, though, is time with his kids, including volunteering at their school where he leads science experiments and happily takes on lunchtime duty.

About Dr. Dianne DeKeyser, MD

Dr. Dianne DeKeyser, MD, is a board-certified psychiatrist with a broad range of experience in outpatient and inpatient psychiatry. She joined Serenity in January of 2019.

After earning her medical doctorate from Spartan Health Sciences University School of Medicine in Vieux Fort, St. Lucia in 2001, Dr. DeKeyser completed her residency training at New York Medical College in Valhalla, New York. She worked in the Midwest for 15 years before returning to Arizona to practice psychiatry.

Since moving back to Arizona, Dr. DeKeyser enjoys spending time with her family at home. In addition, she speaks Italian and loves to travel.

Dr. DeKeyser has a passion for supporting everyday people in their mental health journey. With groundbreaking treatments like ketamine therapy and transcranial magnetic stimulation (TMS therapy), she hopes to help her patients in achieving their full potential and a better quality of life. She also provides ADHD testing, medication management, and other traditional treatment methods. Dr. DeKeyser is excited to meet and connect with new patients at Serenity Mental Health Centers.