Mark Obermyer, MD
Internal Medicine Physician · Brookfield, WI
Mark Obermyer, MD is an internal medicine physician with a practice address in Brookfield, Wisconsin, and NPI 1669634820, issued on Jun 30, 2008. Check the license (Wisconsin 51868, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark Obermyer
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 51868 WI
036118405 IL
Self-reported in NPPES; status is on the state search - Practice location
- 21700 Intertech Dr, Brookfield, WI 53045
- Phone
- (262) 532-8300
- Enumerated
- Jun 30, 2008
- Record last updated
- Jul 10, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (262) 532-8600
- Medicaid ID
- 1669634820 WI
- Medicare enrollment
- Enrolled (PECOS I20081029000657); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 21700 Intertech Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael CadaInternal Medicine Physician1356529804
- Maria Courchane, DPTPhysical Therapist1831087410
- Anna EdlebeckInternal Medicine Physician1073790804
- Brian Fischer, DPMFoot & Ankle Surgery Podiatrist1750720439
- Patrick Fitzgerald, M.D.Internal Medicine Physician1326010026
- Amanda Hallquist, NPFamily Nurse Practitioner1396247789
Verify Mark Obermyer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 51868Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% more Medicare Part D claims than the average internal medicine physician in 2024
4,636 Medicare Part D claims for 450 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 56 claims were for opioids.
Most prescribed
- Atorvastatin Calcium544 claims
- Losartan Potassium262 claims
- Levothyroxine Sodium237 claims
- Amlodipine Besylate201 claims
- Lisinopril190 claims
- Simvastatin173 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
- Froedtert Andthe Medical College OF Wisconsin Community Physicians IncWest Bend, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Obermyer among 2,078 internal medicine physician records in Wisconsin
Mark Obermyer, 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 2008, is newer than 60% of them.
- NPI issued2008 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2004 · median 2002 among the 1,098 with a school on file
- Record last updated2012 · 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).
39 internal medicine physician records list a practice address in Brookfield
They are 39 of the 2,036 NPPES records with a practice address in Brookfield, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Brookfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael CadaBrookfield, WI 530451356529804
- Anna EdlebeckBrookfield, WI 530451073790804
- Patrick Fitzgerald, M.D.Brookfield, WI 530451326010026
- Barbara Horner-Ibler, MDBrookfield, WI 530451225145840
- Christopher Lieb, MDBrookfield, WI 530451427071240
- Swarnambal Mani, M.D.Brookfield, WI 530451487844353
- Peter Martin, MDBrookfield, WI 530451730444282
- Andrea Woodard, M.D.Brookfield, WI 530451558448100
Common questions
What is Mark Obermyer, MD's NPI number?
Mark Obermyer, MD's National Provider Identifier (NPI) is 1669634820, issued on Jun 30, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mark Obermyer, MD located?
The NPPES record lists a practice address at 21700 Intertech Dr, Brookfield, WI, 53045. Phone: (262) 532-8300. Providers update this record themselves, so call before visiting.
How can I verify Mark Obermyer, MD's license?
NPPES lists Wisconsin license number 51868, 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 Mark Obermyer, MD prescribe under Medicare Part D?
In 2024, Mark Obermyer, MD had 4,636 Medicare Part D claims for 450 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.