SSM Health Medical Group
Marisa Lynch, PA-C Physician Assistant, Gastroenterology in Lake St. Louis, MO

Marisa Lynch, PA-C, is a physician assistant who specializes in gastroenterology for adult patients ages 18 and older. She evaluates and treats various gastrointestinal conditions and disorders on an outpatient basis, including liver disease, GERD, esophageal motility disorders, nonalcoholic steatohepatitis (NASH), cirrhosis, primary biliary cholangitis (PBC), primary sclerosing cholangitis (PSC), exocrine pancreatic insufficiency (EPI), Crohn's disease, ulcerative colitis, irritable bowel syndrome (IBS), diverticulitis, ileus, and hemorrhoids. She also sees patients who are experiencing certain troubling symptoms such as constipation, nausea, vomiting, blood in stool, and iron deficiency (anemia).
Marisa provides compassionate, patient-centered gastrointestinal care for her patients, ensuring their needs are properly addressed. Working alongside a team of gastroenterology specialists, she obtains medical histories; conducts physical exams, develops differential diagnoses; and formulates and implements treatment plans to help her patients find relief.
Marisa provides compassionate, patient-centered gastrointestinal care for her patients, ensuring their needs are properly addressed. Working alongside a team of gastroenterology specialists, she obtains medical histories; conducts physical exams, develops differential diagnoses; and formulates and implements treatment plans to help her patients find relief.
About Me
Specialties
Physician Assistant
Gastroenterology
Gender
Female
Education
Missouri State University
Bachelor of Science, 2020
Nova Southeastern University
Master of Physician Assistant Studies, 2023
Hospital Affiliations
SSM Health St. Joseph Hospital - Lake Saint Louis
Certifications
Missouri State Board of Registration
National Comm on Certif of Physician Assistants
Medical Interests
Cirrhosis
Constipation
Crohns disease
Diverticulitis and diverticulosis
Esophageal motility disorders
GERD Gastroesophageal reflux disease
Hemorrhoids
IBS Irritable bowel syndrome
Liver diseases
NASH fatty liver disease
Nausea and vomiting
Reviews
Rating Breakdown
Reviews are measured on a scale of 1 to 5, with 5 being the best score.
Question Breakdown
4.9Overall Experience4.9Listened Carefully4.9Explained Things Clearly4.9Knew Medical History4.9Involved in Care Decisions4.9Showed Courtesy & Respect
Patient Reviews
SSM Health only displays patient satisfaction data for providers included in our survey process and who have a minimum of 30 returned surveys. The overall rating is an average of all responses to the survey questions listed below. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy. Learn more about our survey.
4.9 out of 5
127 ratings,
49 reviews
8/24/2026
Found her truly caring concerning my condition
8/14/2026
She has always been good to me.
8/12/2026
It was a pleasure to meet her. I look foward to her help with my medical health.
7/11/2026
She is awesome!
6/20/2026
I simply appreciate good, friendly, quality service and I want to make sure management is aware when an employee delivers It. You're lucky to have her.
Map & Directions
SSM Health Medical Group
300 Medical PlazaLake St. Louis, MO 63367
Mon
8:00 am - 4:30 pm
Tue
8:00 am - 4:30 pm
Wed
8:00 am - 4:30 pm
Thu
8:00 am - 4:30 pm
Fri
8:00 am - 4:30 pm
Sat
Closed
Sun
Closed
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