JOHN K DERDERIAN DO
NPI 1477595445
Internal Medicine in Lancaster, PA
About John K Derderian Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN K DERDERIAN DO (NPI 1477595445) is an individual internal medicine provider in Lancaster, Pennsylvania, licensed in Pennsylvania (OS011857) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Lancaster General Hospital, and is a graduate of Philadelphia College Of Osteopathic Medicine (2000).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
John K Derderian Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show John Derderian reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Lancaster, PA 17602
- Reassigned Medicare billing, Pennsylvania enrollment
- 151 clinicians in this Medicare group
Wyomissing, PA 19610
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,473 clinicians in this Medicare group
Wyomissing, PA 19610
- Reassigned Medicare billing, Pennsylvania enrollment
- 399 clinicians in this Medicare group
Pottstown, PA 19465
- Reassigned Medicare billing, Pennsylvania enrollment
- 474 clinicians in this Medicare group
Limerick, PA 19468
- Reassigned Medicare billing, Pennsylvania enrollment
- 529 clinicians in this Medicare group
Philadelphia, PA 19127
- Reassigned Medicare billing, Pennsylvania enrollment
- 176 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Lancaster General Hospital
Acute Care Hospitals · Lancaster, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17602 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LANCASTER, PA 17602
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Derderian's NPI number?
The NPI number for John Derderian is 1477595445. It was assigned to this individual provider in the NPPES registry on June 12, 2006.
Where is John Derderian located?
John Derderian practices at 555 N Duke St, Lancaster, PA 17602. The listed phone number is (717) 544-5511.
What is John Derderian's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Derderian enrolled in Medicare?
Yes. John Derderian is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for John Derderian's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Derderian reassigns Medicare benefits to 6 organizations: Lancaster General Hospital (Lancaster, PA), Tower Health Medical Group (Wyomissing, PA), Reading Hospital (Wyomissing, PA), Pottstown Clinic Company LLC (Pottstown, PA), Phoenixville Clinic Company LLC (Limerick, PA) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Derderian's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Derderian affiliated with any hospitals?
According to CMS data, John Derderian is affiliated with Lancaster General Hospital.
When was this NPI record last updated?
The NPPES record for John Derderian was last updated on November 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# John K Derderian, DO · NPI 1477595445
Internal Medicine physician in Lancaster, Pennsylvania. Individual provider, active in the CMS NPPES registry since June 12, 2006.
## Identity
- **NPI:** 1477595445 (Entity type: Individual)
- **Enumerated:** June 12, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** OS011857 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 555 N DUKE ST, Lancaster, PA 17602-2250
- **Phone:** (717) 544-5511
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Lancaster General Hospital (NPI 1730323759, Lancaster, PA); Tower Health Medical Group (NPI 1891036166, Wyomissing, PA); Reading Hospital (NPI 1285355420, Wyomissing, PA); Pottstown Clinic Company LLC (NPI 1649341934, Pottstown, PA); Phoenixville Clinic Company LLC (NPI 1790746345, Limerick, PA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Philadelphia College Of Osteopathic Medicine, class of 2000
## Record status
- **NPPES last updated:** November 1, 2025
- **Other identifiers:** Medicaid 100820028 (PA)
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Source: [NPI Profile](https://npiprofile.com/npi/1477595445) · Data from the CMS NPPES public registry.