Michael J. Westerhaus, M.A., M.D.
Internal Medicine Physician · St Paul, MN
Michael J. Westerhaus, M.A., M.D. is an internal medicine physician with a practice address in St Paul, Minnesota, and NPI 1396882759, issued on Feb 1, 2007. Check the license (Minnesota 54640, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Michael J. Westerhaus
- Credential
- M.A., M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 54640 MN
Self-reported in NPPES; status is on the state search - Practice location
- 451 North Dunlap Street, St Paul, MN 55104
- Phone
- (651) 647-2100
- Enumerated
- Feb 1, 2007
- Record last updated
- May 7, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (651) 647-2201
- Medicare enrollment
- Enrolled (PECOS I20111104000084); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,632 in Minnesota → Look up another NPI →
Also registered at 451 North Dunlap Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tiparpa Chitasombat, CNSClinical Nurse Specialist1417030081
- Jennifer Hines, MDInternal Medicine Physician1437112703
- Kimberly Rathmann, MDPediatrics Physician1134174717
Verify Michael J. Westerhaus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 54640Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% more Medicare Part D claims than the average internal medicine physician in 2024
3,967 Medicare Part D claims for 234 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium361 claims
- Amlodipine Besylate234 claims
- Omeprazole152 claims
- Losartan Potassium118 claims
- Metformin Hcl114 claims
- Lisinopril107 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
- Group Health Plan IncCoon Rapids, MN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael J. Westerhaus among 2,632 internal medicine physician records in Minnesota
Michael J. Westerhaus, M.A., M.D. is one of 2,632 internal medicine physician records with a practice address in Minnesota. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 42% of them.
- NPI issued2007 · 42% of these records are older, 52% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2006 · median 2008 among the 1,700 with a school on file
- Record last updated2020 · 57% 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 Minnesota 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 St Paul
They are 39 of the 815 NPPES records with a practice address in St Paul, and 2,632 internal medicine physician records in Minnesota.
All 2,632 in Minnesota → Every provider in St Paul → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mohamud Afgarshe, MDSaint Paul, MN 551041649246513
- William Brombach, MDSaint Paul, MN 551041225097926
- Mary Jo ConnollySaint Paul, MN 551041730149105
- Brian Flagstad, MDSaint Paul, MN 551041629040993
- Nathan Frink, MDSaint Paul, MN 551041003878760
- Jennifer Hines, MDSt Paul, MN 551041437112703
- Antonio Jhocson, MDSaint Paul, MN 551041295709855
- Michael Kamp, MDSaint Paul, MN 551041073581179
Common questions
What is Michael J. Westerhaus, M.A., M.D.'s NPI number?
Michael J. Westerhaus, M.A., M.D.'s National Provider Identifier (NPI) is 1396882759, issued on Feb 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael J. Westerhaus, M.A., M.D. located?
The NPPES record lists a practice address at 451 North Dunlap Street, St Paul, MN, 55104. Phone: (651) 647-2100. Providers update this record themselves, so call before visiting.
How can I verify Michael J. Westerhaus, M.A., M.D.'s license?
NPPES lists Minnesota license number 54640, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael J. Westerhaus, M.A., M.D. prescribe under Medicare Part D?
In 2024, Michael J. Westerhaus, M.A., M.D. had 3,967 Medicare Part D claims for 234 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.