James J. Greenberg, M.D.
Surgery Physician · Lake Geneva, WI
James J. Greenberg, M.D. is a surgery physician with a practice address in Lake Geneva, Wisconsin, and NPI 1164412136, issued on Oct 21, 2005. Check the license (Wisconsin 53948, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- James J. Greenberg
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License numbers
- 53948 WI
036-087181 IL
Self-reported in NPPES; status is on the state search - Practice location
- N2950 State Road 67, Lake Geneva, WI 53147
- Phone
- (262) 245-0535
- Enumerated
- Oct 21, 2005
- Record last updated
- Sep 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 036087181 IL
- Medicare enrollment
- Enrolled (PECOS I20051116000511); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Kansas City, School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 726 in Wisconsin → Look up another NPI →
Also registered at N2950 State Road 67
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ashley Boro, OTOccupational Therapist1013421908
- Kenneth Bortin, MDCardiovascular Disease Physician1861554743
Verify James J. Greenberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 53948Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average surgery physician in 2024
426 Medicare Part D claims for 188 beneficiaries, against an average of 147 among the 20,115 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 78 claims were for opioids.
Most prescribed
- Pantoprazole Sodium89 claims
- Ondansetron Odt65 claims
- Hydrocodone-Acetaminophen64 claims
- Peg 3350-Electrolyte35 claims
- Omeprazole20 claims
- Hydrocortisone15 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
- Mercy Health System CorporationHarvard, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James J. Greenberg among 726 surgery physician records in Wisconsin
James J. Greenberg, M.D. is one of 726 surgery physician records with a practice address in Wisconsin. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1991 · median 2006 among the 446 with a school on file
- Record last updated2011 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 surgery physician records list a practice address in Lake Geneva
They are 4 of the 366 NPPES records with a practice address in Lake Geneva, and 726 surgery physician records in Wisconsin.
All 726 in Wisconsin → Every provider in Lake Geneva → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Dmitry Pasikhov, MDLake Geneva, WI 531471780791012
- Juanilito Seldera, MDLake Geneva, WI 531471750498945
- Emily Wilczak, M.D.Lake Geneva, WI 531471386969400
- Arthur Angove, D.O.New Berlin, WI 531461083865703
- Mustafa Badrudduja, MDKenosha, WI 531431083744486
- Roger Pacanowski, M.D.Kenosha, WI 531431720112030
- Dennis Vincent, MDNew Berlin, WI 531511386835080
- Jodi Brehm, MDKenosha, WI 531421649216045
Common questions
What is James J. Greenberg, M.D.'s NPI number?
James J. Greenberg, M.D.'s National Provider Identifier (NPI) is 1164412136, issued on Oct 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James J. Greenberg, M.D. located?
The NPPES record lists a practice address at N2950 State Road 67, Lake Geneva, WI, 53147. Phone: (262) 245-0535. Providers update this record themselves, so call before visiting.
How can I verify James J. Greenberg, M.D.'s license?
NPPES lists Wisconsin license number 53948, 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 James J. Greenberg, M.D. prescribe under Medicare Part D?
In 2024, James J. Greenberg, M.D. had 426 Medicare Part D claims for 188 beneficiaries; the average among surgery physician prescribers was 147. 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.