Zachary John Kosak, MD
he/him
Family Medicine
Accepting new patients
Sees patients of all ages
Penn Family Care
Make an appointmentCall 215-662-8777
Headshot of Zachary John Kosak, MD
Penn Medicine Provider

About me

  • Assistant Professor of Clinical Family Medicine and Community Health

Education and training

  • Medical School: Drexel University College of Medicine
  • Residency: UPMC Shadyside Hospital

What my patients think about me

Average Rating

245 reviews

Comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Penn Medicine.

February 2026
he was very helpful
February 2026
perfection
December 2025
he is a great doctor. he cares about his patients.
December 2025
Dr. Kosak is always professional and always precise about what he's telling me about my health and giving me good information and recommended good information. Dr. Kosak is the best.

Insurance accepted

My Locations

Penn Medicine hospital privileges

  • Pennsylvania Hospital: On the medical staff, but does not have privileges to treat patients in the hospital.
  • Penn Presbyterian Medical Center: Has privileges to treat patients in the hospital.
Dr. Kosak is a Penn Medicine physician.

Qualifications and experience

Treatments and Conditions

My research

Orr A, Lee J, Bhatt V, Kosak Z, Wilson S, Linganna A. TaskMaster: The Subintern Adventure Game—game-based learning for medical subintern task prioritization. , MedEdPORTAL, 19: 2023

Weaver-Agostoni J, Kosak Z, Bartlett S Allergic Rhinitis: Rapid Evidence Review , American Family Physician, 107(5): 2023,466-473

Kosak Z Incorporating telehealth into family medicine training: an emerging need , Family Medicine, 54(4): 2022,316-317

Kosak ZJ, Goddard JD, Nakaishi L Shout it out: Combating physician burnout with shared expressions of appreciation and gratitude , Poster presented at the 2021 Family Medicine Education Consortium Annual Meeting, Pittsburgh, PA: 2021

Kosak ZJ, Patel DD Pop goes the patella: A case of patellar tendon rupture , Visual Journal of Emergency Medicine, 7: 2017,11-12

Roesch SL, Styer AM, Wood GC, Kosak Z, Seiler J, Benotti P, Petrick AT, Gabrielsen J, Strodel WE, Gerhard GS, Still CD, Argyropoulos G Perturbations of fibroblast growth factors 19 and 21 in type 2 diabetes , PLoS ONE, 10(2): 2015

Kosak ZJ, McClelland EE, Ory JJ Exploring microarray data from Cryptococcus neoformans to identify novel cryptococcal meningitis virulence indicators , Poster presented at 90th Annual Meeting of the Pennsylvania Academy of Science, Selinsgrove, PA: 2014

Kosak ZJ, Roesch SL, Argyropoulos G The role of fibroblast growth factors 19 and 21 in type 2 diabetes , Poster presented at the Third Annual Susquehanna Valley Undergraduate Research Symposium, Danville, PA: 2013