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Mark Diehl, DO

My Locations

WellSpan Rheumatology
40 V-Twin Dr.
Gettysburg, PA 17325
(717) 339-2790
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About Me

Why I chose to pursue a career in medicine:

As a biology major in college, I had not thought about what career to take. Having had a pediatric kidney disease, I had an interest in medicine. After taking my MCATs and doing well, I applied to medical school and got in on an early acceptance. After spending time in medical school, my focus changed to rheumatology due to my mother's autoimmune disease. After a short time working in the field, I decided this was the direction to go. I love diagnosing and treating autoimmune diseases in rheumatology.


What I want my patients to know about me:

I am very straightforward and will not hold back information. I like my patients to be well educated on their condition and will gladly spend time with them so that they are comfortable with what I feel is going on. Rheumatology is still a field that is considered the art of medicine. Tests are not typically the way to find an answer, a thorough history is. Therefore I do ask a lot of specific questions. My goal is the same as my patients. I want to get them feeling better and back to living a happy productive life doing the things that they like to do.


What I do when I'm not seeing patients:

I enjoy spending time at our family's cabin where there is no cell phone service. I enjoy almost any sport and will watch or play almost all of them. Going to my family's cabin, small weekend trips with friends and exercising are how I enjoy spending a majority of my time away from work. I also have quite an extensive LEGO collection.


Clinical Interests

  • Joint Aspiration/ Injections
  • Osteoporosis
  • Rheumatology

Board Certifications

  • American Board of Osteopathic Internal Medicine | Rheumatology

Education & Credentials

  • Medical School: Philadelphia College of Osteopathic Medicine
  • Internship Program: Community General Osteopathic Hospital
  • Residency Program: Community General Osteopathic Hospital
  • Fellowship Program: Geisinger Medical Center
  • Undergraduate Education: Westminster College

WellSpan Hospital Affiliations

  • WellSpan York Hospital
  • WellSpan Gettysburg Hospital

Health Plans Accepted

WellSpan Financial Assistance Program participant

  • Aetna
  • Aetna Better Health
  • Amerihealth Caritas PA
  • Capital Blue Cross
  • Cigna Healthsprings(Formerly Bravo)
  • Cigna/Greatwest
  • EHP Significa
  • Gateway
  • Geisinger
  • Health America
  • Highmark Blue Shield
  • InterGroup
  • John Hopkins Health Care
  • PA Medical Assistance
  • PA Medicare
  • Preferred Health Care
  • South Central Preferred
  • Tricare
  • United Healthcare Community Plan
  • United Healthcare/ Mamsi
  • UPMC Health Plan
  • Vibra Health Plan

Patient Reviews

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Physician star ratings and patient comments come from after visit survey data that is compiled by Press-Ganey, a leading independent performance measurement company. WellSpan is committed to posting all feedback, whether positive or negative. However, comments may be edited or removed if they are profane or risk the privacy of our patients.



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