Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. John J Messmer, MD

Individual provider Family Medicine Physician · NPI 1669437414

Dr. John J Messmer, MD is a Family Practice in Palmyra, Pennsylvania. Graduated from Pennsylvania State University College of Medicine in 1977, 49 years ago. Practices with The Milton S Hershey Medical Center Physicians Group, a 1,595-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
49
Trained at
Pennsylvania State University College of Medicine
Licensed in
PA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

941 Park Dr
Palmyra, PA 17078-3445
Phone: (800) 233-4082
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD020821E (PA)

Record details

NPI number1669437414
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 17, 2006
Last updated in NPPESNovember 16, 2009
Mailing addressPo Box 854, Mc A410, Hershey, PA 17033-0854

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolPENNSYLVANIA STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 1977 (49 years in practice)
Group practice The Milton S Hershey Medical Center Physicians Group — 1595 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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