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

John K Derderian, DO

Individual provider Internal Medicine Physician · NPI 1477595445

John K Derderian, DO is an Internal Medicine in Lancaster, Pennsylvania. Graduated from Philadelphia College of Osteopathic Medicine in 2000, 26 years ago. Practices with Lancaster General Hospital, a 518-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
26
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
PA
In the registry since
2006
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

555 N Duke St
Lancaster, PA 17602-2250
Phone: (717) 544-5511
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence OS011857 (PA)

Record details

NPI number1477595445
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 12, 2006
Last updated in NPPESNovember 1, 2025
Certification dateNovember 1, 2025
Mailing address555 N Duke St, Lancaster, PA 17602-2250

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2000 (26 years in practice)
Group practice Lancaster General Hospital — 518 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Lancaster