John K. Derderian, DO
Internal Medicine Physician · Lancaster, PA
John K. Derderian, DO is an internal medicine physician with a practice address in Lancaster, Pennsylvania, and NPI 1477595445, issued on Jun 12, 2006. Check the license (Pennsylvania OS011857, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- John K. Derderian
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OS011857 PA
Self-reported in NPPES; status is on the state search - Practice location
- 555 N Duke St, Lancaster, PA 17602
- Phone
- (717) 544-5511
- Enumerated
- Jun 12, 2006
- Record last updated
- Nov 1, 2025
- Medicaid ID
- 100820028 PA
- Medicare enrollment
- Enrolled (PECOS I20040513000583); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2000
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 555 N Duke St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Joyce AbrahamCertified Registered Nurse Anesthetist1962242099
- Marie AceboRegistered Dietitian1053347757
- Nancy Adamopoulos, MDInternal Medicine Physician1003896283
- Jill Adams, MDFamily Medicine Physician1356184733
- Rebecca Adams, CRNPGerontology Nurse Practitioner1780041723
Verify John K. Derderian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS011857Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
15 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital affiliation
- Lancaster General HospitalLancaster, PA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
John K. Derderian among 7,300 internal medicine physician records in Pennsylvania
John K. Derderian, DO is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 64% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2000 · median 2008 among the 4,208 with a school on file
- Record last updated2025 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
91 internal medicine physician records list a practice address in Lancaster
They are 91 of the 5,378 NPPES records with a practice address in Lancaster, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Lancaster → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nancy Adamopoulos, MDLancaster, PA 176021003896283
- Christopher Addis, M.D.Lancaster, PA 176021649269150
- Philip Billoni, MDLancaster, PA 176021255320222
- Hyasmine Charles, MDLancaster, PA 176021922059526
- Vinesh Dedhia, MDLancaster, PA 176021487747614
- Michelle Jordan, DOLancaster, PA 176021700815214
- Otto Lauter, M.D.Lancaster, PA 176021174512230
- Daniel Mast, D.O.Lancaster, PA 176021104910140
Common questions
What is John K. Derderian, DO's NPI number?
John K. Derderian, DO's National Provider Identifier (NPI) is 1477595445, issued on Jun 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John K. Derderian, DO located?
The NPPES record lists a practice address at 555 N Duke St, Lancaster, PA, 17602. Phone: (717) 544-5511. Providers update this record themselves, so call before visiting.
How can I verify John K. Derderian, DO's license?
NPPES lists Pennsylvania license number OS011857, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John K. Derderian, DO prescribe under Medicare Part D?
In 2024, John K. Derderian, DO had 15 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.