DR. WILLIAM S ZIRKER MD
NPI 1447321807
Internal Medicine - Geriatric Medicine in Crum Lynne, PA
About Dr. William S Zirker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM S ZIRKER MD (NPI 1447321807) is an individual geriatric medicine provider in Crum Lynne, Pennsylvania, licensed in Pennsylvania (MD071631L) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. William S Zirker Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show William Zirker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Crum Lynne, PA 19022
- Reassigned Medicare billing, Pennsylvania enrollment
- 654 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.
Areas of Expertise CMS Part B claims 7
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 19022 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 16
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CRUM LYNNE, PA 19022
CRUM LYNNE, PA 19022
CRUM LYNNE, PA 19022
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 William Zirker's NPI number?
The NPI number for William Zirker is 1447321807. It was assigned to this individual provider in the NPPES registry on November 10, 2006.
Where is William Zirker located?
William Zirker practices at 1553 Chester Pike Suite 201, Crum Lynne, PA 19022. The listed phone number is (610) 499-7180.
What is William Zirker's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is William Zirker enrolled in Medicare?
Yes. William Zirker is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for William Zirker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Zirker reassigns Medicare benefits to Prospect Health Access Network, Inc. (Crum Lynne, PA). The 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 William Zirker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for William Zirker was last updated on April 12, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years 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.