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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
87 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

Rate the Provider

Listens Carefully

Spends Enough Time with You

Recommend This Provider to Family/Friends

Shows Respect for Patients

Provides Easy to Understand Information

Explains in a Way You Understand

Patient Comments

At UPMC we believe transparency is critical. Patient comments found on UPMC Find A Doc are not investigated to ascertain truth or validity. Comments are posted in the spirit of providing patient's perceptions of their encounters with their providers.

Patient comments are gathered from our Press Ganey Patient Satisfaction Survey and are displayed in their entirety. Patients are not identified for confidentiality and patient privacy.

April 24, 2017

Dr. Oscar Marroquin is an outstanding cardiologist, and a tremendous asset to UPMC Heart and Vascular Institute team

April 24, 2017


April 17, 2017

Doctor Marroquin always goes out of his way to use videos and props to make sure that what he is explaining is totally understood by the patient and spouse.

April 17, 2017

Dr. Marroquin is one of the best doctors I have ever seen (and I have seen my share). He is, by far, the most caring doctor.

February 13, 2017

Dr. Marroquin took his time to really explain my condition, was very clear about what to do about several different problems, and clearly differentiated between them. He also explained why he came to those conclusions and wanted to make sure that I understood how he arrived at those conclusions. I feel confident about my treatment plan going forward.

January 30, 2017

Excellent, could not be better.

January 23, 2017

Especially appreciated use of evidence-based practice in reviewing medical management.

January 23, 2017

I am very pleased, and have no complaints, what so ever.

January 23, 2017

Care was excellent.

January 23, 2017

Dr. Marroquin is the best Doctor I have ever had. He is a very kind and caring person. He listens to you and answers all your questions in a manner that is easy to understand. He respects you as a person. He takes his time and makes sure you understand everything. You feel good after meeting with Dr. Marroquin. I have recommended him to friends and will continue to recommend him. Doctors do not get any better than Dr. Marroquin. He is a " one and Only" and I am grateful he is my Doctor.