Summary

Dr. Johannes Martensson is a gastroenterologist who specializes in diagnosing and treating disorders of the digestive system. He earned his medical degree from Linkoepings Universitet Haelsouniversitetet and completed his residency at Greenwich Hospital. With over five decades of medical practice, Dr. Martensson brings extensive experience to his specialty field. He is fluent in both English and Spanish.

Dr. Martensson practices in Crystal River, Florida, and maintains affiliations with HCA Florida Citrus Hospital and Tampa General Hospital Crystal River. His expertise includes treating common digestive conditions such as colon polyps, GERD, and acid reflux. He performs essential procedures including colonoscopy, lower GI endoscopy, and laparoscopy to help diagnose and treat gastrointestinal issues. Patients rate Dr. Martensson 3.8 out of 5 stars on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 3.8
  • 51 years of experience
  • speaks English, Spanish
  • Greenwich Hospital
  • 7 written reviews
  • 1 specialty
  • 10 areas of expertise
  • 1 board certification
  • 2 hospital affiliations
  • 1 office location
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Location

Citrus Gastroenterology Pa

6152 W Corporate Oaks DrCrystal River, FL 34429
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

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Dr. Johannes Karl Martensson, MDShauna Sanderson, APRNWhitney Morgan, APRNBrendon Bower, APRN
GastroenterologyGastroenterologyGastroenterologyGastroenterology
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
3.8 
51 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks English, Spanish Speaks English Speaks English Speaks English
Crystal River , FLTallahassee , FLTallahassee , FLTempe , AZ
Med School: Linkoepings Universitet Haelsouniversitetet Med School: Creighton University College of Nursing Med School: Chamberlain University Med School: University of Cincinnati
Current Profile
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Insurance Plans Accepted by Dr. Johannes Karl Martensson

  • Accepts Medicare
  • Accepts Medicaid

Medical Specialties

Dr. Johannes Karl Martensson has the following specialty

Specialty Expertise

Dr. Johannes Karl Martensson 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

51 Years Experience

Dr. Johannes Karl Martensson holds an expired medical license in the state of Florida.

Medical License

Medical Doctor with an expired medical license in the state of Florida that expired in 2026.

Education & Training

Residency

Completed their residency at Greenwich Hospital.

Medical School

Graduated from Linkoepings Universitet Haelsouniversitetet in 1975.

NPI Number

Dr. Martensson's NPI number is 1417954298.

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Frequently Asked Questions

How can I make an appointment with Dr. Johannes Martensson?
You can find contact information for Dr. Johannes Martensson here on Vitals.
Which hospitals is Dr. Johannes Martensson affiliated with?
Dr. Johannes Martensson is affiliated with Hca Florida Citrus Hospital and Tampa General Hospital Crystal River.
Where is Dr. Johannes Martensson's office located?
Dr. Johannes Martensson's office is located at 6152 W Corporate Oaks Dr, Crystal River, FL, 34429.
What languages does Dr. Johannes Martensson speak?
Dr. Johannes Martensson speaks English and Spanish.
Is Dr. Johannes Martensson accepting new patients?
Dr. Johannes Martensson is accepting new patients on Vitals. View Dr. Johannes Martensson's profile on Vitals to make an appointment.

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