Robert E. Williams, MD
Internal Medicine Physician · New Berlin, WI
Robert E. Williams, MD is an internal medicine physician with a practice address in New Berlin, Wisconsin, and NPI 1619909868, issued on Jul 7, 2006. Check the license (Wisconsin 43644, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Robert E. Williams
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 43644 WI
Self-reported in NPPES; status is on the state search - Practice location
- 14555 W National Ave, New Berlin, WI 53151
- Phone
- (262) 827-3636
- Enumerated
- Jul 7, 2006
- Record last updated
- Nov 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 34124200 WI
- Medicare enrollment
- Enrolled (PECOS I20060116000431); accepts Medicare assignment
- Medical or professional school
- Northeastern Ohio University College Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 14555 W National Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Courtney Amborn, DPTPhysical Therapist1629685110
- Sarah Arvelo, APNPNurse Practitioner1326594474
- Michelle Asuncion-Castor, DOFamily Medicine Physician1952044075
Verify Robert E. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 43644Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% more Medicare Part D claims than the average internal medicine physician in 2024
4,092 Medicare Part D claims for 312 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 31 claims were for opioids.
Most prescribed
- Lisinopril245 claims
- Atorvastatin Calcium179 claims
- Pravastatin Sodium166 claims
- Simvastatin153 claims
- Levothyroxine Sodium150 claims
- Amlodipine Besylate123 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.
Bills Medicare through one group practice
- Aurora Advanced Healthcare, Inc.Wauwatosa, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert E. Williams among 2,078 internal medicine physician records in Wisconsin
Robert E. Williams, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% 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, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1997 · median 2002 among the 1,098 with a school on file
- Record last updated2021 · 55% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in New Berlin
They are 17 of the 662 NPPES records with a practice address in New Berlin, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in New Berlin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Basile, M.D.New Berlin, WI 531511962495978
- Andrew Catanzaro, MDNew Berlin, WI 531511003848243
- Steve Chang, MDNew Berlin, WI 531511295897569
- Stephen Desidero, M.D.New Berlin, WI 531511871586818
- Laura Duncan, MDNew Berlin, WI 531511265464408
- Scott Fenske, M.D.New Berlin, WI 531511619960309
- Soo Ah Kim, M.DNew Berlin, WI 531511851529929
- Dennis Mannino, M.D.New Berlin, WI 531511487647186
Common questions
What is Robert E. Williams, MD's NPI number?
Robert E. Williams, MD's National Provider Identifier (NPI) is 1619909868, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert E. Williams, MD located?
The NPPES record lists a practice address at 14555 W National Ave, New Berlin, WI, 53151. Phone: (262) 827-3636. Providers update this record themselves, so call before visiting.
How can I verify Robert E. Williams, MD's license?
NPPES lists Wisconsin license number 43644, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert E. Williams, MD prescribe under Medicare Part D?
In 2024, Robert E. Williams, MD had 4,092 Medicare Part D claims for 312 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.
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.