Gastroenterology

Mark Johnston, MD

Gastroenterology Specialist

Lancaster, PA

Dr. Mark H. Johnston is a gastroenterologist in Lancaster, Pennsylvania, specializing in advanced endoscopic interventions for complex esophageal disorders. He most frequently treats Barrett's esophagus, esophageal cancer, gastroesophageal reflux disease (GERD), painful swallowing (odynophagia), and swallowing difficulty (dysphagia), as well as liver disease, pancreatic disease, and conditions like constipation, nausea, and hepatitis C. His expertise extends to interventional gastroenterology, i

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Credentials

Board Certifications

Internal Medicine (ABIM)
Gastroenterology (ABIM)

Education & Training

Medical School: Hahnemann University (MD, 1985)
Residency: National Naval Medical Center Bethesda (Gastroenterology)
Fellowship: National Naval Medical Center Bethesda (Gastroenterology)

Years in Practice

40+ years

Peer Recognition

Healthgrades — Healthgrades Choice
Healthgrades — Healthgrades Honor Roll

Clinical Focus

Subspecialties

Advanced Endoscopy

Conditions & Treatments

Gastrointestinal Disorders

Insurance(s) Accepted

Please verify your coverage with the provider — plan participation can change.

Practice Details

Hospital Affiliations

Lancaster General Hospital
Penn Medicine Lancaster General Hospital
Lancaster Regional Medical Centers

Languages

English

Conditions Dr. Johnston treats

Gastrointestinal Disorders

Frequently asked

Does Dr. Johnston accept Aetna insurance?

Mark Johnston's public profile lists Aetna, Amerihealth, and Anthem Blue Cross Blue Shield plus 22 more health plans as accepted plans. Plan participation can change — confirm directly with the practice before your visit.

Where does Dr. Johnston practice?

Mark Johnston practices in Lancaster, PA with hospital affiliations including Lancaster General Hospital, Penn Medicine Lancaster General Hospital, and Lancaster Regional Medical Centers.

What does Dr. Johnston specialize in?

Mark Johnston is a board-certified gastroenterology specialist with focus areas in Advanced Endoscopy.

How long has Dr. Johnston been practicing?

Mark Johnston has 41+ years of clinical experience in gastroenterology.

What is Dr. Johnston's medical training?

Public profile training history includes: Medical School: Hahnemann University (MD, 1985); Residency: National Naval Medical Center Bethesda (Gastroenterology); Fellowship: National Naval Medical Center Bethesda (Gastroenterology).