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Mark Diehl, DO

My Locations

Map Marker A 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. My significant other and her 3 boys 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
  • Cigna Healthsprings(Formerly Bravo)
  • EHP Significa
  • Gateway
  • Geisinger
  • GreatWest OneHealth
  • 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



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