Denise M. Harnois, DO
5.0(6 reviews)

Denise M. Harnois, DO
Internal Medicine Physician - Gastroenterology, Internal Medicine Physician - Transplant Hepatology

Highlights

  • Board Certified

Biography

Denise M. Harnois, DO is a Internal Medicine Physician - Gastroenterology, Internal Medicine Physician - Transplant Hepatology practicing in Jacksonville, FL

She has not yet shared a personalized biogr… Read more ›

Featured Review See More Reviews

Coming to Mayo Clinic has truly made a profound difference in my health journey. Dr. Harnois is amazing; she combines deep compassion with life-changing medical excellence! I am amazed at how quickly Dr. Harnois assessed my situation, established a treatment plan, and stabilized my condition - all while taking time to activ…

Anonymous

Summary

Provider Training

UniversityDegreeFocusGraduated
Philadelphia College of Osteo Med, Philadelphia PaOther Degree1990

InstitutionFocusYear
Residency - Mayo Graduate School Med/Mayo FndnNot Specified
Residency - Mayo Graduate School Med/Mayo Fndn, Gastroenterology; Thos Jefferson University Hospital, Internal MedicineNot Specified

CertificationCert. BodyYear
Internal medicineInternal MedicineNot Specified

Specialties

Languages Spoken
English
Medical Specialties
  • Internal Medicine Physician - Sub-Specialty: Gastroenterology
  • Internal Medicine Physician - Sub-Specialty: Transplant Hepatology

Internal Medicine

Accepts New Patients: Yes

Payment Options

Payment Details

Reviews

Average Rating: 5.0
Number of Reviews: 6
Most Recent Review: 09/26/2026
Write a Review

Office & Staff Evaluation Not rated

Ease of Getting an Appointment Not rated
Courtesy of Practice Staff Not rated
Office Appearance & Atmosphere Not rated
Handling of Billing Matters Not rated
Average Wait Time Not Rated
Open full review
Verified Patient

“Coming to Mayo Clinic has truly ...”

Coming to Mayo Clinic has truly made a profound difference in my health journey. Dr. Harnois is amazing; she combines deep compassion with life-changing medical excellence! I am amazed at how quickly Dr. Harnois assessed my situation, established a treatment plan, and stabilized my condition - all while taking time to actively listen without making me feel rushed. She does not stop there. She is a phenomenal educator who ensures I fully understand my disease and exactly what my lab results mean. When it comes to managing my care, instead of just telling me not to worry, she takes the time to explain the science behind why I am okay, which provides me true reassurance. She treats me as an equal partner in my health journey, making me feel deeply respected and valued.She keeps me well-informed on what to watch for and what to expect, while sharing emerging advances in the field and forward-thinking treatment options in the pipeline should we ever need to adjust my plan. Whenever challenges pop up, she always suggests practical ways to handle side effects and boost my quality of life, perfectly balancing the human side of healing with expert medical management. I have absolute trust in her integrity and feel blessed to have her directing my care.

Anonymous 09/26/2026
Open full review
Verified Patient

“Dr Harnois is careful to explain...”

Dr Harnois is careful to explain things in a format that makes it easy to understand. I appreciate the details and the attention that she puts towards my individual case.

Anonymous 02/05/2026
Open full review
Verified Patient

“Best care anywhere...”

Best care anywhere

Anonymous 08/22/2025
Open full review
Verified Patient

“Dr. Harnois is an exemplary phys...”

Dr. Harnois is an exemplary physician. I have been seeing her for thirteen years. She's knowledgeable, pleasant, noncondescending, and takes her time explaining medical issues in a clear, concise manner. Dr. Harnois is crrtainly an asset to your clinic!

Anonymous 06/11/2026
Open full review
Verified Patient

“Dr Harnois is very thorough in h...”

Dr Harnois is very thorough in her explanations and options. I am so grateful to have Dr Harnois monitoring my liver.

Anonymous 09/28/2025
Open full review
Verified Patient

“Good as always...”

Good as always

Anonymous 06/15/2025

Locations

Affiliated Practices

Practice Colleagues

Profile
Katherine Oshel, MD   -   Internal Medicine Physician
0 reviews
Open Profile
Profile
Jorge Mallea, MD   -   Internal Medicine Physician
0 reviews
Open Profile
Profile
Barry Rosser, MD   -   Internal Medicine Physician
0 reviews
Open Profile
Profile
Daniel Yip, MD   -   Internal Medicine Physician
0 reviews
Open Profile
Prasanth Balasubramanian, MBBS   -   Internal Medicine Physician, Transplant Surgeon
0 reviews
Open Profile
Profile
Parag Patel, MD   -   Internal Medicine Physician
0 reviews
Open Profile
Profile
Mary Prendergast, MBBCh, MD   -   Internal Medicine Physician
0 reviews
Open Profile

Procedures & Services

Procedures & Treatments Offered

    Commonly Prescribed Medications

    Denise M. Harnois, DO has not yet listed the medications that she commonly prescribes.

    Accepted Insurance

    Accepted Insurance

    Denise M. Harnois, DO has not yet specified the insurance plans she accepts.