Mark J. Schaefer, M.D.
Anesthesiology Physician · West Allis, WI
Mark J. Schaefer, M.D. is an anesthesiology physician with a practice address in West Allis, Wisconsin, and NPI 1629052428, issued on Dec 5, 2005. Check the license (Wisconsin 31911-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark J. Schaefer
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- 31911-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 8901 W Lincoln Ave, West Allis, WI 53227
- Phone
- (414) 329-4300
- Enumerated
- Dec 5, 2005
- Record last updated
- Jun 4, 2025
- Medicaid IDs
- 31915900 WI
1629052428 WI - Medicare enrollment
- Enrolled (PECOS I20050915000589); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1989
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,313 in Wisconsin → Look up another NPI →
Also registered at 8901 W Lincoln Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amrou Abdelkader, MDAnatomic Pathology & Clinical Pathology Physician1316364698
- Adekunle Adesokan, M.D.Anatomic Pathology & Clinical Pathology Physician1790777043
- Raheel Akhtar, MDHospitalist Physician1750904132
- Tara Alauf, CRNACertified Registered Nurse Anesthetist1639534191
- Orlando Alvarez, M.D.Hospitalist Physician1093731929
- John Amuzu, M.D.Anesthesiology Physician1609859651
Verify Mark J. Schaefer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 31911-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Aurora Medical Group, Inc.West Allis, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark J. Schaefer among 1,313 anesthesiology physician records in Wisconsin
Mark J. Schaefer, M.D. is one of 1,313 anesthesiology 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, 80% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1989 · median 2006 among the 872 with a school on file
- Record last updated2025 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
29 anesthesiology physician records list a practice address in West Allis
They are 29 of the 1,362 NPPES records with a practice address in West Allis, and 1,313 anesthesiology physician records in Wisconsin.
All 1,313 in Wisconsin → Every provider in West Allis → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- John Amuzu, M.D.West Allis, WI 532271609859651
- Bret Borowski, M.D.West Allis, WI 532271659354629
- Daniel Hellman, M.D.West Allis, WI 532271285617092
- Clifford Opatken, M.D.West Allis, WI 532271386628758
- Lily Qian, MDWest Allis, WI 532271164474862
- James Rusch, M.D.West Allis, WI 532271346211133
- Polisetty Sekhar, M.D.Milwaukee, WI 532271487638649
- Kirsten Simanonok, MDWest Allis, WI 532271225083447
Common questions
What is Mark J. Schaefer, M.D.'s NPI number?
Mark J. Schaefer, M.D.'s National Provider Identifier (NPI) is 1629052428, issued on Dec 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark J. Schaefer, M.D. located?
The NPPES record lists a practice address at 8901 W Lincoln Ave, West Allis, WI, 53227. Phone: (414) 329-4300. Providers update this record themselves, so call before visiting.
How can I verify Mark J. Schaefer, M.D.'s license?
NPPES lists Wisconsin license number 31911-020, 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.
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.