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.

Book Appointment

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

Send Us a Message

    Patient Reviews

    Overall patient rating for Riverwalk OBGYN:

    Annual Well Woman Exam

    Dr. Munoz took the time to have an informative and personal conversation. He answered all my questions and truly heard my concerns.

    Gynecological Exams

    Dr. schaefer is a class act. She is smart,thoughtful and caring. I never fill out rhese questionaires. But for this quality of care I did!

    Advanced Laparoscopic Surgery

    Dr. Schaefer is kind and compassionate and takes the time to listen to her patients concerns. It is noticeable how much she cares and is communicative about your care plan.

    Gynecological Exams

    Dr Munoz’s bedside manner is great. He is ready to answer any questions. His care for his patients is genuine.

    Pap Smear

    As always Dr. Simpson is highly professional and it is a pleasure and blessing to have her as my doctor!

    Annual Well Woman Exam

    Dr. Simpson very professional always very caring and happy. Love how she always taken care of my health very professional

    Annual Well Woman Exam

    The appointment was (mostly) on time, I was in and out very quickly with everyone on staff being very courteous and professional.

    Pap Smear

    Dr Simpson gave me information on meds I was already taking that I wasn’t advised of before. I appreciated her help and knowledge. I missed seeing her, due to Medicare only covering this visit every other year.

    Annual Well Woman Exam

    Everyone was friendly and very informative.

    Annual Well Woman Exam

    Slightly longer wait time than for my 10 o’clock appointment.