About Dr. Marco Paez
Dr. Marco A. Paez was born in Miami, Florida. He attended Miami-Dade College and Florida International University (FIU). He graduated with a competitive degree in Biological Sciences with a minor in Psychology. He then matriculated at Georgetown University School of Medicine in Washington, D.C. where he graduated with his Medical Doctorate degree in 2012. During his medical school training, he studied abroad in Argentina where he provided patient care to the community. His talents and passion for patient care took him to Chicago, Illinois where he completed his internship and residency in Internal Medicine from Loyola University Medical Center. During his residency, he received a resident research award for his work on Celiac Disease. He then completed his Gastroenterology Fellowship at Howard University Hospital in Washington, D.C. During his fellowship, he was privileged to have worked alongside leading expert physicians in Hepatology and Liver Transplantation at The Johns Hopkins Hospital in Baltimore, Maryland. He also completed rotations in Gastroenterology at the Washington D.C., Veterans Affair Medical Center, Walter Reed National Military Medical Center in Bethesda, Maryland, and Kaiser Permanent Medical Center in Northern Virginia.
Dr. Paez is passionate about all aspects of Gastroenterology and Hepatology. He has a particular clinical interest in Interventional Gastroenterology as he completed his advanced fellowship training in Interventional Endoscopy and Endosonography at Harbor-UCLA Medical Center in Los Angeles, California in 2019. He developed advanced endoscopic skills including endoscopic mucosal resection of large polyps (EMR), endoscopic ultrasound (EUS), and endoscopic retrograde cholangiopancreatophraphy (ERCP). Dr. Paez is double board certified in Internal Medicine and Gastroenterology. He is also a member of the American Society for Gastrointestinal Endoscopy (ASGE), American Gastroenterological Association (AGA),
In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
Cigna
Medicare
UnitedHealthcare
Practice
United Medical Doctors
United Medical Doctors (UMD) is dedicated to improving the health of our communities by setting the standard of excellence in specialty medical & surgical care. UMD currently offers 50+ medical & surgical specialties with over 200 providers in 80+ locations across four Southern California counties: Riverside, Orange, San Diego & Los Angeles. Our specialties include: Acupuncture | Allergy | Anesthesia | Audiology | Bariatric Surgery | Breast Surgery | Cardiology | Clinical Research | Colorectal Surgery | Complex GI Surgery | Dermatology | Dietitian | Endocrine Surgery | Endocrinology | Family Medicine | Fitness | Foot & Ankle Specialist & Surgery | Gastroenterology | General Surgery | Gynecology | HPB Surgery | Hepatology | Imaging | Infusion Therapy | Internal Medicine | Medical Weight Loss | Men’s Health | Minimally Invasive Gynecologic Surgery | Neurosurgery | Oncology | Otorhinolaryngology (ENT) | Orthopaedic Surgery | Pain Management | Pathology | Pediatric Gastroenterology | Physical Therapy | Plastic Surgery | Psychiatry | Radiology | Spine Medicine | Sports Medicine | Urgent Care | Urogynecology & Female Pelvic Health | Urology | Wound CareOffice locations
United Medical Doctors - Yorba Linda | Gastroenterology (1 of 2)
16677 E Yorba Linda Blvd, Yorba Linda, CA 92886
1 of 2
Education and background
Board certifications
- American Board of Internal Medicine
- Gastroenterology (American Board of Internal Medicine)
Education and training
- Medical School - Georgetown University, Doctor of Medicine
- Loyola University Medical Center, Internship in Internal Medicine
- Loyola University Medical Center, Residency in Internal Medicine
- Howard University Hospital, Fellowship in Gastroenterology
- Harbor-UCLA Medical Center, Fellowship in Interventional Gastroenterology
Professional memberships
- American Society for Gastrointestinal Endoscopy
- American Gastroenterological Association
- American College of Gastroenterology
Awards and publications
- Dr. Marco Paez was Medical Director of the GI division of Citrus Valley Medical associates in Corona, CA where received multiple awards including Presidents Award Recipient of 2020 and selected for Corona’s “40 Under 40 Award” in 2020.
Languages spoken
- English
- Spanish
Provider's gender
Male
NPI number
1902167695
Patient reviews
Overall rating
4.86
Wait time
4.85
Bedside manner
4.77
Your trust matters. All reviews have been submitted by verified patients after seeing the provider. Any content containing private health information is not published.
85 reviews
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Dr Paez was knowledgeable, patient and personable. I would definitely refer him to friends and family.
October 20, 2026Jenny C.Verified patient
The staff is friendly and proffessional. The Dr is thorough and kind.
September 16, 2026Paula S.Verified patient
Dr Paez and his staff were very friendly and professional
September 9, 2026Debra L.Verified patient
Very nice he explained everything and was very kind and patient office staff very nice and welcoming
January 2, 2025Pamela V.Verified patient
Doctor was courteous and explained things in detail. Very easy to work with. Highly recommended!
January 8, 2025Hongdi X.Verified patient
Crowded no where to sit ..
Not a good crowd
Less than 3 months agoInitials hidden
Staff very friendly dr listen to my concerns
September 15, 2026Frank F.Verified patient
Staffs were nice but the doctor was a poor listener, keep cutting me off, did not really let me finish explaining my medical issues and concerns. He did not really ask me any questions, felt rushed, and he put out a bit theatrical act in a manner he spoke to me like I'm a child. Over an hour drive time was wasted.
July 22, 2026Seoeon P.Verified patient
Very pleasant. Listened to my concerns. Explained causes and possible causes. Explained the plan of care. I didn't feel rush
May 20, 2026Connie B.Verified patient
Excellent
April 30, 2026Andrew S.Verified patient
Dr Paez was very through and asked a lot of questions. He took my concerns seriously and gave me a good action plan afterwards!
More than 1 year agoKaelyn C.Verified patient
Dr. Paez is an amazing doctor. I have health anxiety and OCD and he made me feel extremely comfortable and safe through the entire process.
October 13, 2025Jade H.Verified patient
Very thorough and informative.
August 21, 2025Roy T.Verified patient
Dr. Paez is so incredibly nice, friendly, and a great listener. I never once felt rushed through the consultation. He patiently listened to me talking about my health issues and concerns. I felt extremely reassured proceeding with a plan of action with him. Staff was very organized and friendly. I was able to book an initial consultation as well as future appointments with Dr. Paez within a very reasonable time frame.
July 15, 2025Natasha S.Verified patient
Overall everything went super well. Office was nice and clean with lots of information to read while you wait. Doctor and nurse were very polite they greeted me with big smiles, which made me feel more at ease.
April 18, 2025Claudia O.Verified patient
I had a great visit with Dr. Paez! He was incredibly friendly and made me feel very comfortable throughout my appointment. He took the time to explain everything clearly and mentioned that my procedure would take place just down the street, which I really appreciated.
However, when I checked out with the front office, I was surprised to learn that my insurance wasn’t accepted at the Orange County location, and I would need to go to the Riverside office instead—over an hour away with a 6:45 AM check-in time. Definitely a bit of a bummer, and I wish I had known this information earlier.
The office itself was clean and welcoming, but I did notice the front staff didn’t seem very cheerful. They looked tired and weren’t very engaging, which made the checkin/checkout process feel a bit impersonal.
Overall, Dr. Paez was wonderful, and I’m glad I had the chance to meet with him! I just hope future patients get all the insurance details upfront to avoid any last-minute surprises. ??
March 28, 2025Deanna B.Verified patient
My experience at Dr. Paez's office was excellent: I arrived early and was seen early. He has an engaging manner while still being focused on the details of and motivation for the plan of care. I was able to schedule another appointment within a week: super-grateful for the efficiency of the staff as well. Although I had to drive some ways for the appointment, I think that, in the end (given what I read about other gastroenterology practices), choosing that route will probably save me time overall.
October 29, 2024Ben S.Verified patient
I had a great experience with Dr. Paez and his receptionist, Urelly. They were so welcoming and made me feel very comfortable. Dr. Paez answered all of my questions and really took time with me.
September 13, 2024Stephanie S.Verified patient
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