NPPES file of Aug 9, 2026

William S. Zillweger, M.D.

Internal Medicine Physician · Pittsburgh, PA

William S. Zillweger, M.D. is an internal medicine physician with a practice address in Pittsburgh, Pennsylvania, and NPI 1285607002, issued on Feb 10, 2006. Check the license (Pennsylvania 054995L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1285607002
Name
William S. Zillweger
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
054995L PA
Self-reported in NPPES; status is on the state search
Practice location
9104 Babcock Blvd, Pittsburgh, PA 15237
Phone
(412) 366-2950
Enumerated
Feb 10, 2006
Record last updated
Jan 12, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(412) 366-2775
Medicare enrollment
Enrolled (PECOS I20100928001484); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →

Also registered at 9104 Babcock Blvd

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. William AbrahamSpecialist1205805587
  2. Whitney Adams, CRNPNurse Practitioner1578996450
  3. Daniel AgnewSpecialist1811966112
  4. Sharon Baer, DOObstetrics & Gynecology Physician1306800917
  5. Paul Baldwin, M.D.Orthopaedic Surgery Physician1578884409
  6. Katie Barry, MSSpeech-Language Pathologist1881996007

Verify William S. Zillweger in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
    Search for license 054995L    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Pennsylvania license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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76% more Medicare Part D claims than the average internal medicine physician in 2024

5,585 Medicare Part D claims for 279 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 281 claims were for opioids.

  1. William Zillweger5,585
  2. Specialty average3,176

Most prescribed

  1. Eliquis295 claims
  2. Levothyroxine Sodium187 claims
  3. Atorvastatin Calcium179 claims
  4. Metoprolol Succinate176 claims
  5. Furosemide151 claims
  6. Amlodipine Besylate146 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: $13.64

1 payment: food and beverage; the largest payer was Tactile Systems Technology Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. William Zillweger$13.64
  2. Specialty average$1,303.06

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Genesis Medical Associates, Inc.Pittsburgh, PA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

William S. Zillweger among 7,300 internal medicine physician records in Pennsylvania

William S. Zillweger, M.D. 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
  • Graduated1982 · median 2008 among the 4,208 with a school on file
  • Record last updated2011 · 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).

750 internal medicine physician records list a practice address in Pittsburgh

They are 750 of the 28,866 NPPES records with a practice address in Pittsburgh, and 7,300 internal medicine physician records in Pennsylvania.

All 7,300 in Pennsylvania → Every provider in Pittsburgh → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. James Boyle, M.D.Pittsburgh, PA 152371578541165
  2. Nancy Carroll, MDPittsburgh, PA 152371982693909
  3. Douglas Clough, MDPittsburgh, PA 152371497765564
  4. Ashim Dayalan, MDPittsburgh, PA 152371376508028
  5. Robin Dietly, M.D.Pittsburgh, PA 152371629056114
  6. Judith EsmanPittsburgh, PA 152371053332304
  7. Raymond Gallon, MDPittsburgh, PA 152371144208810
  8. Donald KlinestiverPittsburgh, PA 152371114904075

Common questions

What is William S. Zillweger, M.D.'s NPI number?

William S. Zillweger, M.D.'s National Provider Identifier (NPI) is 1285607002, issued on Feb 10, 2006. An NPI identifies a provider in billing; it is not a license.

Where is William S. Zillweger, M.D. located?

The NPPES record lists a practice address at 9104 Babcock Blvd, Pittsburgh, PA, 15237. Phone: (412) 366-2950. Providers update this record themselves, so call before visiting.

How can I verify William S. Zillweger, M.D.'s license?

NPPES lists Pennsylvania license number 054995L, 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. Zillweger, M.D. prescribe under Medicare Part D?

In 2024, William S. Zillweger, M.D. had 5,585 Medicare Part D claims for 279 beneficiaries; 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.