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To speak with an appointment scheduler, call 1-800-533-UPMC between 7 a.m. and 7 p.m. Monday through Friday.

Note: We can schedule appointments for many — but not all — UPMC doctors and locations at this number.

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Internal Medicine

Sub Specialty:
Interventional Cardiology
Bloodless Medicine

Hospital Affiliation(s):
UPMC Northwest
UPMC Shadyside
Magee-Womens Hospital of UPMC
UPMC Mercy
UPMC Passavant
UPMC Presbyterian

Language Spoken:

Patient Satisfaction Ratings:
5 Stars
73 Patient
Satisfaction Ratings
Learn About Our Survey


University of Pittsburgh Physicians

UPMC Heart and Vascular Institute
UPMC Presbyterian
200 Lothrop St.
Suite 5B
Pittsburgh, PA 15213
Office Phone:
(412) 647-6000


Cardiovascular Disease, American Board of Internal Medicine
Interventional Cardiology, American Board of Internal Medicine


MD, Universidad Franciso Marroquin, Guatemala City, Guatemala

University of Pennsylvania Health System,
Philadelphia, PA

University of Pittsburgh School of Medicine,
Pittsburgh, PA

University of Pittsburgh School of Medicine,
Pittsburgh, PA

Mount Sinai Medical Center,
Miami Beach, FL

Appointment Information

New Patients

Appointment Information

Call 1-800-533-UPMC (8762), Monday through Friday between 7 a.m. and 7 p.m. to schedule an appointment OR call the locations listed above to speak with a representative.

Returning Patients

  • Your doctor may participate in scheduling through MyUPMC. If you would like to book online, please log in and visit the Appointments tab.
  • Call the locations listed above to speak with a representative.

Patient Ratings

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Recommend This Provider to Family/Friends

Shows Respect for Patients

Provides Easy to Understand Information

Explains in a Way You Understand

Patient Comments

Patient comments are gathered from our Press Ganey Patient Satisfaction Survey and are displayed in their entirety. Patients are de-indentified for confidentiality and patient privacy.

September 19, 2016

Dr. Marriquin is a great Doctor

September 12, 2016

excellent care from all

September 12, 2016

Excellent by all.

August 22, 2016

the dr is great ! can't say enough about him

August 22, 2016

The Doctor is great, and I trust him with my life. I have always had a good visit with him.

August 15, 2016

very positive experience

August 08, 2016

dr Marriqyin is always attentive and a data driven provider. excellent experience as always

July 25, 2016

Met my expectations. All staff was professional and courteous. Dr Marroquin is the best.

July 18, 2016

Dr. Marroquin and staff are the best!!!!!

July 11, 2016

BAD: (1) Being charged a hospital visit fee just for the privilege of walking down the hospital hallways to get to the doctors office. (2) Lack of data record keeping in order to prove to insurance company that I am eligible for a new medication that may help preserve or extend my life. GOOD: Oscar Marroquin is one of the best, most caring physicians I have had the privilege of knowing. He is a very knowledgeable and caring individual.