SSM Health Medical Group
Marisa Lynch, PA-C
Physician Assistant, Gastroenterology

Marisa Christopher, 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
Liver diseases
GERD Gastroesophageal reflux disease
Esophageal motility disorders
NASH fatty liver disease
Cirrhosis
Crohns disease
Ulcerative colitis
IBS Irritable bowel syndrome
Diverticulitis and diverticulosis
Hemorrhoids
Constipation
Reviews
Rating Breakdown
Reviews are measured on a scale of 1 to 5, with 5 being the best score.
Question Breakdown
4.9Overall Experience4.8Listened Carefully4.9Explained Things Clearly4.8Knew 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
122 ratings,
48 reviews
6/19/2026
She explained everything about my up coming proceedure very good.
6/5/2026
She is very knowledgeable.
5/16/2026
Took time to listen
5/14/2026
She was nice
5/12/2026
She's great!
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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