Summary

Dr. Johannes Martensson is a gastroenterologist who has dedicated five decades to digestive health care. He earned his medical degree from Linkoepings Universitet Haelsouniversitetet and completed his residency at Greenwich Hospital. With 51 years of clinical experience, Dr. Martensson brings extensive knowledge to the diagnosis and treatment of digestive disorders. He is fluent in both Spanish and English.

Dr. Martensson practices at HCA Florida Citrus Hospital and Tampa General Hospital Crystal River, serving patients in Crystal River, Florida. His expertise includes treating colon polyps, GERD, and acid reflux. He performs colonoscopies and lower GI endoscopies to help diagnose digestive conditions. Dr. Martensson also conducts fecal occult blood tests to screen for potential health concerns. Patients have given him an average rating of 3.8 on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 3.8
  • 51 years of experience
  • speaks Spanish, English
  • 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, MD
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Dr. Johannes Karl Martensson, MDAlexandra Morgan, APRNAllison Duncan, APRNRachel Oliver, 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 Spanish, English Speaks English Speaks English Speaks English
Crystal River , FLLittleton , COTempe , AZSACRAMENTO , CA
Med School: Linkoepings Universitet Haelsouniversitetet Med School: Chamberlain University Med School: Indiana State University Med School: University of South Alabama
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

Which hospitals is Dr. Johannes Karl Martensson affiliated with?
Dr. Johannes Karl Martensson is affiliated with Hca Florida Citrus Hospital and Tampa General Hospital Crystal River.
Does Dr. Johannes Karl Martensson accept my insurance?
You can see the insurance plans that Dr. Johannes Karl Martensson accepts on their Vitals profile.
How can I make an appointment with Dr. Johannes Karl Martensson?
You can find contact information for Dr. Johannes Karl Martensson here on Vitals.
Does Dr. Johannes Karl Martensson accept virtual/telehealth appointments?
Dr. Johannes Karl Martensson has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Where is Dr. Johannes Karl Martensson's office located?
Dr. Johannes Karl Martensson's office is located at 6152 W Corporate Oaks Dr, Crystal River, FL, 34429.

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