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Physician Assistant | Gastroenterology
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Expertise
Anemia | Biliary Disease | Esophageal Diseases | Gastroesophageal Reflux | Inflammatory Bowel Disease | View more
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St. Luke's Care Network Provider
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Specialities:
Physician Assistant | GastroenterologyExpertise
Anemia | Biliary Disease | Esophageal Diseases | Gastroesophageal Reflux | Inflammatory Bowel Disease | Intestinal Diseases | Liver Disease | Peptic Ulcer Disease | Stomach Diseases/DisordersMy duty in gastroenterology is to provide each patient with the highest quality, evidence-based care available. When seeing patients, my first step is understanding who they are as an individual and identifying their specific priorities and goals. I encourage each patient to take an active role in their health and believe education is essential for patients and their families. Through their personal involvement and education, patients acquire an exceptional understanding of their diagnoses.
I am a board-certified physician assistant in gastroenterology at St. Luke’s Monroe inpatient and outpatient settings. I completed my degree at DeSales University and have worked in gastroenterology for the past 15 years. I work alongside an amazing team of colleagues.
Outside work, I enjoy camping, hiking, reading and spending time with my family and pets. We live by “trusting our gut.”
star Reviews
The Patient Satisfaction Rating is an average of all responses to the care provider related questions from our nationally recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.
Responses are measured on a scale of 1 to 5 with 5 being the best score.
The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of St. Luke's University Health Network.
“Nurse & Staff Very Knowledgeable And Courteous!”
June 24, 2025
“Marissa and Dr Cohen always take the time to listen to my concerns and always help to alleviate my issues”
June 22, 2025
“Marisa is always such a sweetheart! I enjoy my checkup visits with her.”
June 16, 2025
“Great...caring care!!”
June 14, 2025
“I messaged her in the portal. She responded quickly and efficiently.”
June 9, 2025
“This provider is one of the very few Dr's that listened to my concerns even though they weren't her specialty and put referrals in for the right drs. This provider truly cares about her patients!”
May 21, 2025
“Marisa provided excellent care, would definitely recommend her.”
May 18, 2025
“Everything was great”
April 26, 2025
“All was good”
April 18, 2025
“Very friendly and helpful physician and staff. Marissa actually listens to her patients and try's to help find a solution to problems. She is amazing and has helped me out so much trying to figure out what is wrong with me.”
April 14, 2025
“Marisa has a fantastic bedside manner!”
March 31, 2025
“Very concerned for my health and very pleasant appointment. Knowledgeable in all aspects of this situation.”
March 29, 2025
“I love all my St.Lukes doctors”
March 15, 2025
“Very good experience. Was able to get in early and out early. Very professional team.”
February 26, 2025
“Great people at this office!!!”
February 24, 2025
“Marisa is the best and the reason I stay with this practice.”
February 14, 2025
“No waiting And thorough”
January 19, 2025
“The provider was excellent!”
January 18, 2025
“Marisa is awesome.”
January 17, 2025
“It was a great experience,Marisa is a class act. She puts me at ease.”
December 29, 2024
“I love my provider MARISA GUARINO she knew all questions & concerns & took care of it right away. The staff is wonderful”
December 23, 2024
“Marisa Guarino was very patient and knowledgeable about my concerns, and even had my pre-send email of various records in front of her when she came into the room. Always good to know someone is taking the time to listen and the digital system really works too. Two days later I called in with follow u concerns and she even called me back same day to help.”
December 16, 2024
“Marissa is wonderful! She listens and explains things perfectly.”
December 3, 2024
“For a first visit was a very productive visit positive experience with Marisa Guarino”
December 1, 2024
“Preparing for procedure with MARISA GUARINO instructions to follow.”
November 27, 2024
“Saw this provider in the emergency room . She, Marisa Guarino was excellent & did not make me wait for hours to get results of tests. Need more PA,s like her .”
November 18, 2024
“All good!! at visit with Marisa Guarino”
November 15, 2024
“Every one was very kind at the office of Marisa Guarino”
November 9, 2024
“Good”
October 30, 2024
“Pleasant experience with Marisa Guarino”
October 26, 2024
“I was very impressed with Marisa Olsommer. She listened very carefully, was kind and helpful. I felt that It was a very productive visit.”
October 18, 2024
“I always get the best results from my provider Marisa, she gives me the best advice possible, I am happy she is my provider.”
October 18, 2024
“This office is excellent. Marissa is wonderful. She is knowledgeable, professional and caring. I am blessed to have her care”
October 14, 2024
“Marisa Guarino and All staff were very helpful and very congenial”
October 13, 2024
“All my visits with Marisa Guarino are good. She is an exceptional care giver”
October 2, 2024
“I have seen Marissa for many years and have always been there to help. This is during medical visits and phone calls she had to return. No one is better at her job...”
September 24, 2024
“I just love my provider MARISA GUARINO she is very knowledgeable, compassionate, understanding, she listens to me when I really need to talk to someone. I'm beyond greatful that I have such an amazing provider. Thank you, St. Luke's,”
September 24, 2024
“The service from Marisa Guarino I received was excellent very professional very courteous and very polite.”
September 15, 2024
5.0 RATING
“I have been seeing Marisa for approximately 10 years. I would definitely recommend her.”
July 27, 2025