Welcome to Riverwalk OBGYN

Overall patient rating:

In 1979 Tristan Castaneda, MD started with a simple premise: Make available to every woman the health resources she needs to live a healthy, active, and long life. At the same time, educate each woman about the importance of preventative health measures. This same idea still drives us today, some 30 years later. The track record we’ve accumulated over the years speaks to our commitment to patients, their families, and the community at large. Both our medical and office staffs are second to none, who genuinely take an interest in individual patient’s needs. We think you’ll notice the difference immediately when you step foot inside our doors. We’d love to see you today to map out a health and wellness plan that’s tailored to your health history and needs.

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About Our Practice

  • Providers

  • Services

  • Links And Forms

  • Locations

  • Contact Us

  • Alka Arya Degaetano

  • Ricardo Munoz

  • Stephanie Schaefer

  • Christina Simpson

  • Heather Williams


We Provide The Following Services

  • Obstetrics + Reproduction
  • Pregnancy Care and Delivery
  • Contraception
  • Ultrasound and Imaging
  • Gynecology + Wellness
  • Annual Exams
  • Menopause
  • Urogynecology

Riverwalk OBGYN: San Antonio Office

  • Monday: 8:30AM - 5:30PM
  • Tuesday: 8:30AM - 5:30PM
  • Wednesday: 8:30AM - 5:30PM
  • Thursday: 8:30AM - 5:30PM
  • Friday: 8:30AM - 5:30PM

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    Patient Reviews

    Overall patient rating for Riverwalk OBGYN:

    Childbirth / Labor & Delivery

    I would give 5 stars but the clinic always cancle or reschedule my appointment even it's urgent.

    Menopause Management / Education

    Dr. Munoz and his staff are amazing! I have been with Dr. Munoz for over 7 years and I have had nothing but the best treatment from him and his staff. Everyone is nice and professional. Very courteous and caring.

    Annual Well Woman Exam

    Always friendly and Very knowledgeable. Dr. Simpson is the absolute best at what she does. I've been seeing her for years and has always provided exceptional care.

    Gynecological Problem Visit

    Im 100% satisfied with my dr service is just that always takes me long time to get hold on somebody from the staff to get and app . I call and they put me in hold over and over . As well they you guys give several appointment at the same time thing that make me wait for an hour , one time I has to wait almost 2 hours that’s not fair but if we arrive late , that is a problem , they way the staff is few people is nice the other ones are rude when sometimes we see there with pain there is not empathy. I’m actually just going there bc of Arya otherwise If she could be in other location I definitely will avoid 100% this one. As I said I’m just using river walk bc of Arya , she is the only dr I had trusted since I arrived to the USA , she is clear and willing to help but as well a knowledgeable person and I feel she care about her patients

    IUD Insertion / Removal

    Dr. Simpson is a great doctor. I appreciate her care through my pregnancy and post partum.

    Annual Well Woman Exam

    I had a very good visit. Perhaps providing a wipe in the changing room before the examination would be helpful. The restroom downstairs at the facility had no toilet paper. I grabbed a paper towel above the sink and just wet it to manage.

    Pap Smear

    I have been a patient for close to 25 years. Dr. Cristina Simpson is the ultimate professional and best doctor. I feel very well taken care of. Dr. Simpson is the BEST!

    OB Care

    Dr. Carreon Simpson is compassionate, knowledgeable and strives to find the best course of action for treatment. She analyzed my medical condition, records and talked to me about how best to treat my condition. She also goes above and beyond to make you feel comfortable and informed about what may be occurring.

    Pap Smear

    Dr. Simpson is very thorough and she makes sure that I am very comfortable during the visit and she ensures that she takes a holistic approach to her patients

    Gynecological Problem Visit

    I feel that I can be totally open when discussing my issues with her. Although GYN exams are never something to look forward to, I am not as self conscious with her as I have been with all my other OBGYNS over the course of 45 years. Her exams are quick, but thorough. She can carry on a conversation with you as if nothing else is going on in the room. She asks important questions that you may never have given any thought to in the past. She listens to you and allows for the patient to make decisions based on the facts she has given you. It is so important for women to have a OBGYN that they trust and feel comfortable with. Dr. Simpson is one of those doctors.