NPPES file of Aug 9, 2026

Magdalena Flejsierowicz, MD

Hematology & Oncology Physician · Milwaukee, WI

Magdalena Flejsierowicz, MD is a hematology & oncology physician with a practice address in Milwaukee, Wisconsin, and NPI 1144246737, issued on Jul 15, 2006. Check the license (Wisconsin 39044, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1144246737
Name
Magdalena Flejsierowicz
Credential
MD
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License number
39044 WI
Self-reported in NPPES; status is on the state search
Practice location
1218 W Kilbourn Ave, Milwaukee, WI 53233
Phone
(414) 219-7370
Enumerated
Jul 15, 2006
Record last updated
Oct 3, 2023
Medicaid ID
32555100 WI
Medicare enrollment
Enrolled (PECOS I20050909000606); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 1218 W Kilbourn Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Aboud Affi, M.D.Gastroenterology Physician1003891250
  2. Saleem Bakhtiar, MDSurgery Physician1528077294
  3. Adam Basler, M.D.Surgery Physician1376983627
  4. Elisabeth Biggs, PA-CPhysician Assistant1073754776
  5. Valerie Black, PA-CPhysician Assistant1710933957
  6. Rachel Crouch, PA-CPhysician Assistant1780269910

Verify Magdalena Flejsierowicz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 39044    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Wisconsin license search

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19% fewer Medicare Part D claims than the average hematology & oncology physician in 2024

709 Medicare Part D claims for 158 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 29 claims were for opioids.

  1. Magdalena Flejsierowicz709
  2. Specialty average877

Most prescribed

  1. Anastrozole239 claims
  2. Prednisone42 claims
  3. Abiraterone Acetate36 claims
  4. Eliquis30 claims
  5. Hydroxyurea28 claims
  6. Tamoxifen Citrate24 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 3 group practices

  1. Aurora Advanced Healthcare, Inc.Mequon, WI
  2. Aurora Health Care Metro, Inc.Milwaukee, WI
  3. Aurora Medical Group, Inc.Milwaukee, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Hematology & Oncology Physician providers in Wisconsin

There are 295 hematology & oncology physician records in Wisconsin.

All 295 in Wisconsin → Every provider in Milwaukee →

Other hematology & oncology physician records in Wisconsin

  1. Chady Abboud Leon, M.D.Marshfield, WI1770737744
  2. Kareem Abdelhadi, MDRice Lake, WI1841494432
  3. Sameem Abedin, MDMilwaukee, WI1063641157
  4. Faith Abodunrin, MDMilwaukee, WI1437768769
  5. Rami Abumasmah, MDOshkosh, WI1972779551
  6. Syed AbutalibMilwaukee, WI1114183290
  7. Kalid Adab, MDMilwaukee, WI1346473345
  8. Jacob Adashek, DOGermantown, WI1144780107
  9. Gulrayz Ahmed, M.D.Milwaukee, WI1033561808
  10. Othman AkhtarMilwaukee, WI1619325404

Common questions

What is Magdalena Flejsierowicz, MD's NPI number?

Magdalena Flejsierowicz, MD's National Provider Identifier (NPI) is 1144246737, issued on Jul 15, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Magdalena Flejsierowicz, MD located?

The NPPES record lists a practice address at 1218 W Kilbourn Ave, Milwaukee, WI, 53233. Phone: (414) 219-7370. Providers update this record themselves, so call before visiting.

How can I verify Magdalena Flejsierowicz, MD's license?

NPPES lists Wisconsin license number 39044, 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 Magdalena Flejsierowicz, MD prescribe under Medicare Part D?

In 2024, Magdalena Flejsierowicz, MD had 709 Medicare Part D claims for 158 beneficiaries; the average among hematology & oncology physician prescribers was 877. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.