Brett Linzer, M.D.
Internal Medicine Physician · Oconomowoc, WI
Brett Linzer, M.D. is an internal medicine physician with a practice address in Oconomowoc, Wisconsin, and NPI 1083686653, issued on Feb 7, 2006. Check the license (Wisconsin 42014, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Brett Linzer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 42014 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1185 Corporate Center Dr, Oconomowoc, WI 53066
- Phone
- (262) 928-8400
- Enumerated
- Feb 7, 2006
- Entity
- Type 1 · individual
Also registered at 1185 Corporate Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Allen, M.D.Family Medicine Physician1871804336
- Katherine Brockway, NPRegistered Nurse1891500906
- Dan Cleary, MDInternal Medicine Physician1972615136
- Eric Conradson, M.D.Internal Medicine Physician1518976232
- Firas Ghanem, M.D.Internal Medicine Physician1124008529
- John Gucciardi, M.D.Family Medicine Physician1760417430
Verify Brett Linzer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 42014Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
2.3 times the Medicare Part D claims of the average internal medicine physician in 2024
6,344 Medicare Part D claims for 521 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 182 claims were for opioids.
Most prescribed
- Losartan Potassium454 claims
- Atorvastatin Calcium359 claims
- Levothyroxine Sodium296 claims
- Lisinopril261 claims
- Amlodipine Besylate206 claims
- Metoprolol Succinate203 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.
16 internal medicine physician records list a Oconomowoc practice address
They are 16 of the 506 NPPES records with a Oconomowoc practice address, and 2,832 internal medicine physician records in Wisconsin.
All 16 in Oconomowoc → All 2,832 in Wisconsin → Every provider in Oconomowoc →
Other internal medicine physician records in Wisconsin
- Sheetal Aatrai, MDMarshfield, WI1417568965
- Noormuhammad Abbasakoor, M.D.Sheboygan, WI1558645895
- Khalid Abdelgadir, MDManitowoc, WI1407433295
- Kareem Abdelhadi, MDRice Lake, WI1841494432
- Mesfin Abdissa, MDMilwaukee, WI1376579417
- Mohamed Fouzi Abdul Hameed, M.D.Weston, WI1255590899
- Hamza Abdul Majeed, DOMilwaukee, WI1881013282
- Anas Abed, MDMadison, WI1659002566
- Sameem Abedin, MDMilwaukee, WI1063641157
- Vincent Abejuela, DOMilwaukee, WI1356928543
Common questions
What is Brett Linzer, M.D.'s NPI number?
Brett Linzer, M.D.'s National Provider Identifier (NPI) is 1083686653, issued on Feb 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brett Linzer, M.D. located?
The NPPES record lists a practice address at 1185 Corporate Center Dr, Oconomowoc, WI, 53066. Phone: (262) 928-8400. Providers update this record themselves, so call before visiting.
How can I verify Brett Linzer, M.D.'s license?
NPPES lists Wisconsin license number 42014, 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 Brett Linzer, M.D. prescribe under Medicare Part D?
In 2024, Brett Linzer, M.D. had 6,344 Medicare Part D claims for 521 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.