Mark Douglas Porta Jr., M.D.


9103 Jefferson Hwy

Baton Rouge, LA 70809

Open today 8 AM - 5 PM

Quick Facts

  • Board Certified Gastroenterologist
  • Currently Accepting New Patients
  • Most Insurance Plans Accepted
  • Performs Colonoscopies

GA, LLC - Baton Rouge, LA - Jefferson Hwy

Gastroenterology in Baton Rouge, LA

GA, LLC - Baton Rouge, LA - Jefferson Hwy

9103 Jefferson Hwy

Baton Rouge, LA 70809

Open today 8 AM - 5 PM

Request an Appointment

If you are experiencing a medical emergency, please call 9-1-1. This form is intended for non-urgent appointment requests only. Non-emergency requests will be responded to within 24-48 hours.

About Mark Douglas Porta Jr., M.D.

Why did you choose to specialize in Gastroenterology?

I chose Gastroenterology because I enjoy the opportunity to interact and speak with patients on a daily basis. I believe this subspecialty provides both a medical and surgical approach to treatments. The procedural modalities available allow for both treatment and preventative therapies as well. I enjoy taking part in the evolution within the field of gastroenterology and look forward to seeing what the future holds.

Do you have a specialty of interest within GI?

No specific interest within GI at present.

Where did you study?

I went to Louisiana State University and graduated with a bachelors in basic science. I attended medical school at Louisiana State University in New Orleans from 2008-2012. I received my Internal Medicine training at Louisiana State University in Baton Rouge from 2012-2015. I completed subspecialty training in Gastroenterology and Hepatology at Louisiana State University in Shreveport from 2015-2018.

What certifications do you hold?

Board Certified in Internal Medicine, Board Eligible in Gastroenterology

What do you and your family enjoy doing in your spare time?

On my days off, I enjoy spending time with my wife, family, and friends. My passion outside the field of medicine is music. I have played electric and acoustic guitar for over 20 years and counting. I also enjoy playing golf and tennis.

Please list your professional affiliations.

American College of Gastroenterology
American Gastroenterology Association
American Society for Gastrointestinal Endoscopy


Had an appointment with Dr. Porta actually saw his physician assistant Mallory. Very professional, young lady who knows her stuff very satisfied with how she told me what to do with my digestive issues would recommend them to anyone thank you gastroenterology associates.

B.T. Google

Dr Douglas Walsh is the BEST. He has been my husband's Dr for going on 6 years now and he saved his life. When he started seeing him it was in the hospital and was only given 48 hours to live being diagnosed with Stage 4 Cirrhosis of the liver with only 13% liver function at the time of arrival at the hospital. Was in ICU for 5 days and Rehab for 21 days. Was 270 lbs when he got sick now at 209 and will be 6 years sober this year 2023. Numbers are good with lab results. Thanks to Dr Walsh and God for giving him a second chance at life.

D.M. Google

Dr. Porta is a professional, a good listener. I feel much better after taking medicine he prescribed

K.T. Google

Very satisfied with visit.

S.A. Google

Dr.MacDonald is Simply AWESOME!!! He’s very kind and caring. He always makes me feel as if my concerns are important.

S.W. Google


Total Reviews


Average Rating