David L. Diehl
Distinguished in Gallstones

Dr. David L. Diehl

Gastroenterology
Geisinger Health System
Geisinger Medical Center - Gastroenterology
100 North Academy Avenue, 
Danville, PA 

Distinguished in Gallstones
Geisinger Health System
Geisinger Medical Center - Gastroenterology
100 North Academy Avenue, 
Danville, PA 
OverviewInsuranceLocationsClinical ResearchSimilar Doctors

Overview

Dr. Diehl is a board-certified and fellowship-trained gastroenterologist. His clinical interests include endoscopic ultrasound, endoscopic retrograde cholangiopancreatography (ERCP) and innovative advanced therapeutic endoscopy. Dr. Diehl obtained his medical degree from the University of California, Los Angeles. He completed his residency at Harbor-UCLA Medical Center and his fellowships in gastroenterology at the University of California, San Francisco Medical Center and the University of California, Los Angeles Medical Center. Dr. Diehl is certified by the American Board of Internal Medicine. In his free time, Dr. Diehl enjoys spending time with his family and exercising, particularly swimming. He also has an appreciation for old cars.

Dr. Diehl is rated as a Distinguished provider by MediFind in the treatment of Gallstones. His top areas of expertise are Barrett Esophagus, Gallbladder Disease, Watermelon Stomach, Endoscopy, and Gallbladder Removal.

His clinical research consists of co-authoring 143 peer reviewed articles and participating in 4 clinical trials. MediFind looks at clinical research from the past 15 years. In particular, he has co-authored 1 article in the study of Gallstones.

Graduate Institution
UCLA - David Geffen School Of Medicine, 1983 - Doctor Of Medicine
Residency
Harbor - UCLA Medical Center, 1987
Specialties
Gastroenterology
Licenses
Internal Medicine in PA
Board Certifications
The American Board Of Internal Medicine
Fellowships
University of California - San Francisco Medical, 1988
Hospital Affiliations
Geisinger Medical Center
Languages Spoken
English
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Capital Blue Cross
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • OTHER MEDICARE PART D
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
Geisinger
  • HMO
  • POS
  • PPO
Highmark
  • EPO
  • HMO
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
Moda Health
  • EPO
  • PPO
PA Health and Wellness
  • HMO
  • MANAGED MEDICAID PLAN
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
UPMC
  • EPO
  • PPO
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 9 Less Insurance Carriers -

Locations

Geisinger Medical Center - Gastroenterology
100 North Academy Avenue, Danville, PA 17822
Call: 800-275-6401

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.


4 Clinical Trials

Nitrous Oxide For Endoscopic Ablation of Refractory Barrett's Esophagus (NO FEAR-BE)
Nitrous Oxide For Endoscopic Ablation of Refractory Barrett's Esophagus (NO FEAR-BE)
Enrollment Status: Active_not_recruiting
Publish Date: December 11, 2025
Intervention Type: Device
Study Phase: Not Applicable
Multi-center Clinical Study to Evaluate the C2 CryoBalloon Focal Ablation System for the Treatment of Patients With Previously Untreated Dysplastic Barrett's Epithelium
Multi-center Clinical Study to Evaluate the C2 CryoBalloon Focal Ablation System for the Treatment of Patients With Previously Untreated Dysplastic Barrett's Epithelium
Enrollment Status: Active_not_recruiting
Publish Date: January 13, 2025
Intervention Type: Device
Study Phase: Not Applicable
Prospective, Multicenter Study for the Evaluation of Safety and Performance of the Interscope EndoRotor Endoscopic Mucosal Resection System for the Removal of Alimentary Tract Mucosa in the Colon
Prospective, Multicenter Study for the Evaluation of Safety and Performance of the Interscope EndoRotor Endoscopic Mucosal Resection System for the Removal of Alimentary Tract Mucosa in the Colon
Enrollment Status: Completed
Publish Date: April 05, 2022
Intervention Type: Device
Study Phase: Not Applicable
Multi-center Prospective Registry Study Utilizing a Double Balloon Accessory Device to Facilitate Endoscopic Polypectomy in Large Intestine.
Multi-center Prospective Registry Study Utilizing a Double Balloon Accessory Device to Facilitate Endoscopic Polypectomy in Large Intestine.
Enrollment Status: Unknown
Publish Date: December 11, 2020
Intervention Type: Device
View 3 Less Clinical Trials

143 Total Publications

Correction: Effectiveness of transoral endoscopic fundoplication with or without hiatal hernia repair in patients with gerd and chronic cough.
Correction: Effectiveness of transoral endoscopic fundoplication with or without hiatal hernia repair in patients with gerd and chronic cough.
Journal: Surgical endoscopy
Published: November 03, 2025
View All 143 Publications
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717-234-2561
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Aman Ali is a Gastroenterologist in Camp Hill, Pennsylvania. Dr. Ali is rated as a Distinguished provider by MediFind in the treatment of Gallstones. His top areas of expertise are Familial Pancreatic Cancer, Angiodysplasia of the Colon, Acute Pancreatitis, Endoscopy, and Gastrectomy.

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Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Diehl's expertise for a condition
ConditionClose
  • Elite
  • Barrett Esophagus
    Dr. Diehl is
    Elite
    . Learn about Barrett Esophagus.
    See more Barrett Esophagus experts
  • Endoscopy
    Dr. Diehl is
    Elite
    . Learn about Endoscopy.
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  • Distinguished
  • Achalasia
    Dr. Diehl is
    Distinguished
    . Learn about Achalasia.
    See more Achalasia experts
  • Angiodysplasia of the Colon
    Dr. Diehl is
    Distinguished
    . Learn about Angiodysplasia of the Colon.
    See more Angiodysplasia of the Colon experts
  • Cholecystitis
    Dr. Diehl is
    Distinguished
    . Learn about Cholecystitis.
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  • Gallbladder Disease
    Dr. Diehl is
    Distinguished
    . Learn about Gallbladder Disease.
    See more Gallbladder Disease experts
  • Gallstones
    Dr. Diehl is
    Distinguished
    . Learn about Gallstones.
    See more Gallstones experts
  • Hiatal Hernia
    Dr. Diehl is
    Distinguished
    . Learn about Hiatal Hernia.
    See more Hiatal Hernia experts
View All 8 Distinguished Conditions
  • Advanced
  • Acute Pancreatitis
    Dr. Diehl is
    Advanced
    . Learn about Acute Pancreatitis.
    See more Acute Pancreatitis experts
  • Benign Esophageal Stricture
    Dr. Diehl is
    Advanced
    . Learn about Benign Esophageal Stricture.
    See more Benign Esophageal Stricture experts
  • Bile Duct Obstruction
    Dr. Diehl is
    Advanced
    . Learn about Bile Duct Obstruction.
    See more Bile Duct Obstruction experts
  • Childhood Pancreatitis
    Dr. Diehl is
    Advanced
    . Learn about Childhood Pancreatitis.
    See more Childhood Pancreatitis experts
  • Choledocholithiasis
    Dr. Diehl is
    Advanced
    . Learn about Choledocholithiasis.
    See more Choledocholithiasis experts
  • Cholestasis
    Dr. Diehl is
    Advanced
    . Learn about Cholestasis.
    See more Cholestasis experts
View All 17 Advanced Conditions
  • Experienced
  • Accessory Pancreas
    Dr. Diehl is
    Experienced
    . Learn about Accessory Pancreas.
    See more Accessory Pancreas experts
  • Alcoholic Cirrhosis
    Dr. Diehl is
    Experienced
    . Learn about Alcoholic Cirrhosis.
    See more Alcoholic Cirrhosis experts
  • Bile Duct Stricture
    Dr. Diehl is
    Experienced
    . Learn about Bile Duct Stricture.
    See more Bile Duct Stricture experts
  • Biliary Dyskinesia
    Dr. Diehl is
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  • Childhood Volvulus
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  • Cholangiocarcinoma (Bile Duct Cancer)
    Dr. Diehl is
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    . Learn about Cholangiocarcinoma (Bile Duct Cancer).
    See more Cholangiocarcinoma (Bile Duct Cancer) experts
View All 43 Experienced Conditions
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