William S. Zirker, MD
Geriatric Medicine (Internal Medicine) Physician · Crum Lynne, PA
William S. Zirker, MD is a geriatric medicine (internal medicine) physician with a practice address in Crum Lynne, Pennsylvania, and NPI 1447321807, issued on Nov 10, 2006. Check the license (Pennsylvania MD071631L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William S. Zirker
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- MD071631L PA
Self-reported in NPPES; status is on the state search - Practice location
- 1553 Chester Pike, Crum Lynne, PA 19022
- Phone
- (610) 499-7180
- Enumerated
- Nov 10, 2006
- Record last updated
- Apr 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (610) 499-7190
- Medicaid ID
- 001824510 PA
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 228 in Pennsylvania → Look up another NPI →
Also registered at 1553 Chester Pike
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Deborah Kahn, MDInternal Medicine Physician1942371026
Verify William S. Zirker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD071631LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
3,502 Medicare Part D claims for 264 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 27 claims were for opioids.
Most prescribed
- Atorvastatin Calcium241 claims
- Amlodipine Besylate213 claims
- Levothyroxine Sodium145 claims
- Pantoprazole Sodium125 claims
- Metformin Hcl119 claims
- Lisinopril100 claims
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.
Industry payments in 2024: $268.26
13 payments; by number, the most common kind was food and beverage; the largest payer was Ucb, Inc. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William S. Zirker among 228 geriatric medicine (internal medicine) physician records in Pennsylvania
William S. Zirker, MD is one of 228 geriatric medicine (internal medicine) physician records with a practice address in Pennsylvania. 72% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 38% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2012 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 geriatric medicine (internal medicine) physician records list a practice address in Crum Lynne
They are 2 of the 18 NPPES records with a practice address in Crum Lynne, and 228 geriatric medicine (internal medicine) physician records in Pennsylvania.
All 228 in Pennsylvania → Every provider in Crum Lynne → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Igor Dorokhine, MDCrum Lynne, PA 190221538229075
- Robert Furia, MDDrexel Hill, PA 190261194727347
- Joseph Goldschmidt, MDDrexel Hill, PA 190261942202197
- Jugeet KanwalChester, PA 190131295256253
- Emmanuel Okolo, MDFlourtown, PA 190311457340317
- Kathryn Beldowski, M.D.Broomall, PA 190081487947487
- Christopher Hwang, M.D.Broomall, PA 190081912249061
- Firas Saidi, MDHuntingdon Valley, PA 190061962472696
Common questions
What is William S. Zirker, MD's NPI number?
William S. Zirker, MD's National Provider Identifier (NPI) is 1447321807, issued on Nov 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William S. Zirker, MD located?
The NPPES record lists a practice address at 1553 Chester Pike, Crum Lynne, PA, 19022. Phone: (610) 499-7180. Providers update this record themselves, so call before visiting.
How can I verify William S. Zirker, MD's license?
NPPES lists Pennsylvania license number MD071631L, 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 William S. Zirker, MD prescribe under Medicare Part D?
In 2024, William S. Zirker, MD had 3,502 Medicare Part D claims for 264 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.