Summary

Dr. Karl Mersich is a gastroenterologist who earned his medical degree from Semmelweis Medical University in Budapest. He completed his residency training at St. Mary's Hospital within the Unity Health System, focusing on internal medicine before specializing in gastroenterology. With nearly five decades of clinical experience, Dr. Mersich holds board certification in internal medicine from the American Board of Internal Medicine. He provides care in English to patients throughout his practice.

Dr. Mersich practices at Gastroenterology of Greater Orlando in Orange City, Florida, and maintains hospital privileges at Unity Hospital At Rochester Regional Health. He specializes in treating common digestive conditions including hemorrhoids, colon polyps, and esophagitis. His procedural expertise includes performing colonoscopies and both upper and lower gastrointestinal endoscopies to diagnose and treat digestive system disorders. Patients have given Dr. Mersich an average rating of 4.0 on Vitals.
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Quick Facts

  • accepting new patients
  • 4
  • 49 years of experience
  • 36 insurance plans accepted
  • speaks English
  • St Mary'S Hosp-Unity Hlth Sys, Gastroenterology
  • 1 written review
  • 1 specialty
  • 10 areas of expertise
  • 2 board certifications
  • 1 hospital affiliation
  • 2 office locations
  • Male

Office Locations

Dr. Karl T. Mersich has 2 locations

Gastroenterology of Greater Orlando - Orange City

2884 Wellness Ave Ste 100Orange City, FL 32763
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Gastroenterology of Greater Orlando - Wellness Avenue Surgery Center

2863 WELLNESS AVEORANGE CITY, FL 32763
Mon6:00 am - 5:00 pm
Tue6:00 am - 5:00 pm
Wed6:00 am - 5:00 pm
Thu6:00 am - 5:00 pm
Fri6:00 am - 5:00 pm
SatClosed
SunClosed

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Dr. Karl T. Mersich, MDLynn Collette-Zachar, APRNBrittany Hanson, APRNRebecca Humphries, APRN
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
49 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks English Speaks English Speaks English Speaks English
Orange City , FLTallahassee , FLMontgomery , ALSACRAMENTO , CA
Med School: Semmelweis Orvostudomanyi Egyetem (Peter Pazmany Univ)- Budapest Med School: Regis College Med School: University of South Alabama Med School: Emory University
Current Profile
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Insurance Plans Accepted by Dr. Karl T. Mersich

  • Aetna
  • Ambetter
  • APWU
  • Blue Cross Blue Shield
  • Buckeye Health Plan
  • Buckeye Health Plan - Medicaid
  • CarePlus Health Plans (Florida Medicare)
  • CHAMPVA
  • Cigna
  • Devoted Health
  • First Health (Coventry Health Care)
  • Florida Community Care
  • Florida Health Care Plans
  • Florida Health Care Plans - HMO
  • Freedom Health
  • Freedom Health - HMO
  • Golden Rule
  • Health First Health Plans
  • Humana
  • Humana - HMO
  • Humana - PPO
  • Johns Hopkins Employer Health Programs
  • Medicaid - Medicaid
  • Medicaid - Medicaid (Managed)
  • Medical Mutual
  • Medicare
  • Medicare - Medicare
  • Meritain Health
  • Oscar Health Insurance
  • STLDentalPlan| LLC
  • Tricare
  • UnitedHealthcare
  • UnitedHealthcare - HMO
  • UnitedHealthcare - Medicare
  • UnitedHealthOne
  • Wellcare

Medical Specialties

Dr. Karl T. Mersich has the following specialty

Specialty Expertise

Dr. Karl T. Mersich has the following 10 areas of expertise

  • Abdominal Pain
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Acid Reflux Disease (GERD)
  • Celiac Disease
  • Colonoscopy
  • Constipation
  • Hemorrhoids
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Certifications, License, & Education

49 Years Experience

BOARD CERTIFICATIONS

American Board of Internal Medicine

Internal medicine

MEDICAL LICENSE

Medical Doctor, Florida, 2026, Expired

EDUCATION & TRAINING

Residency

St Mary'S Hosp-Unity Hlth Sys, Gastroenterology
St Mary's Hospital Rochester Ny
St Marys Hospital
UMDNJ

Medical School

Semmelweis Orvostudomanyi Egyetem (Peter Pazmany Univ)- BudapestGraduated in 1977
Semmelweis University Faculty of MedicineGraduated in 1977
University of Medicine of Budapest,Budapest, HungaryGraduated in 1977

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Frequently Asked Questions

Is Dr. Karl Mersich accepting new patients?
Dr. Karl Mersich is accepting new patients on Vitals. View Dr. Karl Mersich's profile on Vitals to make an appointment.
Where is Dr. Karl Mersich's office located?
Dr. Karl Mersich's office is located at 2884 Wellness Ave Ste 100, Orange City, FL, 32763.
How can I make an appointment with Dr. Karl Mersich?
You can find contact information for Dr. Karl Mersich here on Vitals.
Does Dr. Karl Mersich accept virtual/telehealth appointments?
Dr. Karl Mersich has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
What languages does Dr. Karl Mersich speak?
Dr. Karl Mersich speaks English.

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