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Dr. Thomas Ganz, MD

Dr. Thomas Ganz, MD

Obstetrics & Gynecology*
10+ years of experience

Dr. Thomas Ganz, MD is an obstetrician gynecologist in O Fallon, MO and has over 10 years of experience in the medical field. He graduated from Saint Louis University School of Medicine in 2012. He is affiliated with SSM Health St. Joseph Hospital-Lake Saint Louis. He is accepting new patients.

3.5 Star Rating
Based on 11 reviews 3.5 Star Rating (11 reviews)

Practice

1101 Highway K O Fallon, MO 63366

Dr. Ganz is a Healthgrades Choice provider in Obstetrics & Gynecology

The Healthgrades Choice designation helps you understand the most important factors to consider when choosing a healthcare professional. This designation is earned based on four set standards.
Read our methodology

  • Above average experience
  • Good hospital quality
  • Good patient ratings
  • No healthcare sanctions
  • Explains Conditions Well
    Patients said this doctor explains conditions well. See reviews
  • Practices at Top Hospital
    Patient Safety Excellence Award™ See hospitals
  • Recent Reviews
    Reviews made in the last 30 days. See reviews
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Dr. Ganz's Reviews

Likelihood to recommend Dr. Ganz

3.5
11 ratings, 10 with a written review
5 star
64%
64%
4 star
0%
0%
3 star
0%
0%
2 star
0%
0%
1 star
36%
36%

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Rude and inconsiderate
Was very condescending, laughed at me when I expressed my concerns made me feel belittled and told me doing anything would be pointless since I don’t have a partner trying to get me pregnant right now. He did blood work but made sure to tell me it would be pointless. When I checked MyChart I saw that my testosterone was ONE point away from being over in the red and I have symptoms of high testosterone. It was never addressed. He also tried to tell me it’s normal to have cysts on my ovaries and it doesn’t mean I have PCOS. Which is not true, and I’ve had clear symptoms ALL MY LIFE. He’s known me since I first started having irregular periods and was the one that put me on BC to manage my severe symptoms. He’s unprofessional, he made me feel awful and I had to hold back tears after he examined me and acted condescending immediately afterwards because of my questions
What went well
  • Appointment scheduling
  • Staff friendliness
  • Wait times
What could be improved
  • I didn't feel respected
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
Helpful
Apr 02, 2025
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I was a new patient about a week ago and it my experience all around was great! I have endometriosis and was really knowledgeable in more current treatment than most I’ve been to! He listened, didn’t rush me or make me feel silly for questions or concerns! I was seen quickly and everything went smoothly
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 other person found this helpful
Helpful
Lauren – Jan 24, 2022
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I have been seeing Dr. Ganz since 2018. He is genuinely a great doctor. He listens to all of my questions, comments & concerns & provides understandable feedback as well as compassionate feedback. He doesn't & never has treated me like I was just another patient. There were plenty of times were I'm SURE we talked for an hour or more. He cares, he is real & he is honest. 10/10 would recommend to ANYONE looking for an OBGYN!!!
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Jul 24, 2021
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I have dr.ganz took 5 days to call me back about the medicine he failed to have sent off to be filled and many phone calls everyday and then said he wasn't sure why it wasn't sent to another on call obgyn to be done now I'm bleeding and he has yet to return my call..here's to another 5 days or waiting and hoping baby is okay
What went well
No results
What could be improved
  • Office environment
2 others found this helpful
Helpful
Annoyed patient – Mar 16, 2021
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Caring, competent, and professional. Good bedside manner. I felt confident he would take good care of me and he did!
What went well
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Feb 13, 2021
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I have Endometriosis, and I recently had a cyst rupture on my right ovary and was in pain for over a week and had an appointment to see him. I wanted to make sure everything was okay and talk about how bad my pain had been. He rushed and acted as if I were only there for a pap. He wasn't knowledgeable in what was in my records. He kept asking questions about being ready to try getting pregnant and seemed to only want to help further if we were ready to try. I was very disappointed and let down.
What went well
No results
What could be improved
No results
5 others found this helpful
Helpful
Apr 16, 2019
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I was extremely impressed by this doc. It was my first visit with him and he addressed every question I had with great detail. He literally answered my questions for a good 40 minutes and then before he walks out of the room, he was asking me if I had any more questions!!! I’ve never had a doctor be so caring and spend so much time answering my many questions.
What went well
No results
What could be improved
No results
1 other person found this helpful
Helpful
Apr 04, 2019
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I've never been treated so horribly in my life. This doctor was extremely rude, unprofessional and demeaning. Dr. Ganz should not be seeing women or anyone for that matter. I wouldn't recommend him to my worst enemy. I was a new patient. In pain. Waited 30 minutes before he came into the room. Rushed our appointment. After a 2 week long wait for a follow up, he yelled at me stating the entire wait was my fault. Extreme caution.
What went well
No results
What could be improved
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
6 others found this helpful
Helpful
Troy , MO – Jan 29, 2019
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An amazing doctor never have i ever met someone that cared so much for his patients. Best dr by far i looked forward to all my appointments. Incredible experience.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 other person found this helpful
Helpful
Oct 16, 2018
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Super satisfied with switching to Dr.Ganz. Very down to earth and knowledgeable of his field. Great with answering any questions and making his patients feel comfortable.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
4 others found this helpful
Helpful
Asia in MO – Jun 15, 2018
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About Me

Watch Dr. Ganz's Video

biography

Thomas GanzMD, specializes in obstetrics and gynecology. He received his medical degree from Saint Louis University School of Medicine and completed his residency at the Saint Louis University department of obstetrics, gynecology, and women's health....read more
  • Obstetrics & Gynecology

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • Saint Louis University School Of Medicine

    Medical School, 2012
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. To learn more about the difference between these sources, please refer to our FAQs.
Healthgrades has not received any data indicating a board action exists for this provider.

Dr. Ganz is a Healthgrades Choice provider in Obstetrics & Gynecology

    Read our methodology

    Locations

    Practice

    SSM Medical Group Inc.1101 Highway K O Fallon, MO 63366
    1

    Practice

    SSM Health Medical Group172 Professional Pkwy Troy, MO 63379
    2

    Practice

    Office18800 Schnucks Dr Ste B Warrenton, MO 63383
    3

    Affiliated Hospitals

    • SSM Health St. Joseph Hospital-Lake Saint Louis

      100 Medical Plz
      Lake Saint Louis, MO 63367
      Recipient of 2
      hospital awards

      Patient Safety Excellence Award™ (2025)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      View all awards

      How patients felt about the care they received at this hospital.

      83%
      Patients said they were given information about recovering at home

      1% lower than the national average

      76%
      Patients said that nurses always listened to them and explained things well

      1% higher than the national average

      View all patient feedback
    Learn more about how Healthgrades measures Hospital Quality