Learn More About Me
Specialties: Gastroenterology
Languages: English, Spanish
About me
Lester K. Bowser, MD, is a gastroenterologist at MedStar Union Memorial Hospital. He is board-certified in gastroenterology by the American Board of Internal Medicine and fellowship-trained in gastroenterology.
Dr. Bowser specializes in general gastroenterology, including EGD, which allows diagnosis and treatment of problems in the upper gastrointestinal tract; colonoscopy to screen for colon cancer; capsule endoscopy; biliary tract disorders; inflammatory bowel disease; liver and gallbladder disease; and Hepatitis C.
Earlier in his career, Dr. Bowser served as a Major in the United States Army, providing gastroenterological leadership and care for active duty military and their family members throughout the United States. He is a native Baltimorean and decided to return to the community after completing his military service as a gastroenterologist.
He has a special interest in colon cancer screening.
Clinical areas of focus
- Abdominal Cramping
- Abdominal Pain
- Capsule Endoscopy
- Chronic Diarrhea
- Colonoscopy With Biopsy
- Constipation
- Dysphagia
- Endoscopic Retrograde Cholangiopancreatography
- Enteroscopy
- Gastrointestinal Bleeding
- Gastrointestinal Bleeding And Rectal Bleeding
- Lower Gi Endoscopy
- Nausea
- Sigmoidoscopy With Biopsy
- Stomach Cramps
- Upper Gi Endoscopy
- Variceal Band Ligation
- Vomiting
Conditions and procedures
Conditions I treat
- Abdominal Adhesions
- Abdominal Cramping
- Abdominal Distension
- Abdominal Pain
- Abnormal Digestive Findings
- Abnormal Stool
- Achalasia
- Acute Pancreatitis
- Alimentary Tract Foreign Body
- Altered Bowel Habits
- Anal Abscess
- Anal Fissures
- Anus And Rectum Diseases
- Aphagia
- Appendiceal Cancer
- Autoimmune Hepatitis
- Benign Neoplasm Of Colon, Rectum, Anus And Anal Canal
- Benign Neoplasm Of Digestive System
- Bile Duct Stones
- Biliary Tract Obstruction
- Blood In Stool
- Bowel Obstruction
- Choledocholithiasis
- Chronic Diarrhea
- Colitis
- Colon Disease
- Colon Polyp
- Colon Polyps
- Colon Stricture
- Colonic Obstruction
- Colorectal Malignancy
- Constipation
- Crohn's Disease
- Crohn's Disease [Regional Enteritis]
- Diabetic Gastroparesis
- Diaphragmatic Hernia
- Digestive System Complications
- Digestive System Diseases
- Digestive System Symptoms
- Diseases Of Esophagus
- Diverticular Disease
- Diverticulitis
- Duodenal Ulcer
- Duodenitis
- Dysphagia
- Epigastric Pain
- Esophageal Cancer
- Esophageal Stricture
- Esophagitis
- Flatulence
- Functional Intestinal Disorders
- Gallbladder Cancer
- Gallstones
- Gastric Cancer
- Gastric Varices
- Gastritis
- Gastroenteritis
- Gastroesophageal Reflux Disease
- Gastrointestinal Bleeding
- Gastrointestinal Bleeding And Rectal Bleeding
- Gastrointestinal Stromal Tumor (GIST)
- Helicobacter Pylori
- Hemangioma
- Hemangioma Of Digestive System
- Hemorrhoids
- Hepatitis
- Hepatitis B
- Hepatitis C
- Hepatomegaly
- Hepatomegaly And Splenomegaly
- Inflammatory Bowel Disease
- Intestinal Infections
- Intestinal Stenosis
- Irritable Bowel Syndrome
- Jaundice
- Liver Cirrhosis
- Liver Encephalopathy
- Liver Failure
- Liver Fibrosis
- Malabsorption
- Malnutrition
- Melena
- Nausea
- Noninfective Gastroenteritis
- Pancreatic Diseases
- Pancreatitis
- Paralytic Ileus And Intestinal Obstruction
- Perianal Fistula
- Perianal Pain
- Peripheral Vascular Disease Of The Intestines
- Polycystic Liver Disease
- Portal Hypertension
- Postoperative Ileus
- Postprandial Diarrhea
- Proctitis
- Rectal Cancer
- Rectal Pain
- Small Intestine Cancer
- Stomach Cancer
- Stomach Cramps
- Stomach Ulcers
- Swallowing Disorders
- Ulcerative Colitis
- Viral Hepatitis
- Vomiting
Procedures I perform
- Capsule Endoscopy
- Colonoscopy
- Colonoscopy Through Stoma
- Colonoscopy With Biopsy
- Colonoscopy With Injection
- Electrogastrography
- Endoscopic Argon Plasma Coagulation
- Endoscopic Clip Placement
- Endoscopic Laser Therapy
- Endoscopic Lower Esophagus Extraction
- Endoscopic Mucosal Resection
- Endoscopic Retrograde Cholangiopancreatography
- Endoscopic Stomach Feeding Device Insertion
- Endoscopic Stricture Dilation
- Enteroscopy
- Enteroscopy With Bleeding Control
- Esophageal Debridement
- Esophageal Dilation
- Esophageal PH Monitoring
- Esophagogastroduodenoscopy With Biopsy
- Flexible Colonoscopy With Biopsy
- Gastric Manometry
- Gastric Stenting
- Gastroesophageal Reflux Disease
- Gastrointestinal Motility Study
- Gastrojejunostomy
- Ileoscopy With Biopsy
- Inflammatory Bowel Disease
- Lower Gi Endoscopy
- Lower Gi Therapeutic Substance Introduction
- Retrograde Cholangiopancreatography
- Sclerotherapy For Gastrointestinal Bleeding
- Sigmoidoscopy With Biopsy
- Stomach Drainage
- Transrectal Ultrasound
- Upper Esophagus Dilation, Endoscopic
- Upper Gi Endoscopy
- Variceal Band Ligation
Practice locations
Distance from Change Location Enter your Location
5601 Loch Raven Blvd
Russell Morgan Bldg 3rd Fl
Baltimore, MD, 21239
201 E University Pkwy
33rd St Bldg Ste 233
Baltimore, MD, 21218
1300 Bellona Ave
Ste A
Lutherville, MD, 21093
3400 N Calvert St
Baltimore, MD, 21218
9512 Harford Rd
Ste 201
Baltimore, MD, 21234
Insurance
This list represents the major payors accepted by MedStar Health. NOTE: Payor contracts change and not all plans associated with a payor may be covered. Payors may offer multiple plans. If you have a question related to your insurance, please contact your insurance plan directly. Contact information is located on your health insurance ID card. *Denotes limited participation. Specific providers and practices may NOT be participating. Please contact your insurance plan directly.
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List of insurance plans we accept
- Aetna
- CareFirst BlueCross BlueShield of Maryland
- Cigna Health Care
- Kaiser Permanente*
- MedStar Select (Administered by CareFirst)
- United HealthCare
- Aetna
- CareFirst BlueCross BlueShield of Maryland
- Healthspring
- Humana
- Medicare & Railroad Medicare
- United HealthCare
- Aetna Better Health of Maryland *
- Medical Assistance/Medicaid
- MedStar Family Choice MD
- Priority Partners *
- United HealthCare Community Health Plan MD
- Wellpoint MD
- AmeriHealth Caritas
- Health Services For Children With Special Needs (HSCSN)
- Medical Assistance/Medicaid
- MedStar Family Choice DC
- Johns Hopkins Employer Health Programs *
- Johns Hopkins US Family Health Plan *
- MultiPlan
- Private Healthcare Systems
- Tricare/Humana Military
- VA Community Care Network (VACCN)
Videos
Education
Board Certification: American Board of Internal Medicine, Gastroenterology
Fellowship: San Antonio Uniformed Services Health Education-Army (2000)
Residency: Walter Reed National Medical Center (1997)
Medical School: University of Pittsburgh School of Medicine (1994)
Awards
- Top Doc (Gastroenterology) - Baltimore Magazine, 2013
- Top Doc (Gastroenterology) - Baltimore Magazine, 2015 Top Doc (Gastroenterology) - Castle Connolly, 2025
Hospital affiliations
News and publications
- "Large Colonic Lipoma With Mucosal Ulceration Mimicking Carcinoma." Gastrointestinal Endoscopy. September 2003, 468-470
- "Viral Hepatitis Serology." The El Paso Physician. December 2000, 18-24.
- "The Role of Surveillance ERCP in Preventing Episodic Cholangitis in Patients with Recurrent Common Bile Duct Stones." Gastrointestinal Endoscopy. February 2000, 247-248.
- "Antibiotic Prophylaxis Prior to GI Endoscopy: A Survey of ASGE Members." DDW Poster Presentation. May 1999
- “Percutaneous Pseudocyst Drainage”. KENS TV Channel 5 (CBS affiliate) Medical Breakthroughs Segment. March 1999.
- "Environmental Fate and Effects of Chemical Simulants." U.S. Army Technical Report. January 1989