MAGDALENA FLEJSIEROWICZ MD
NPI 1144246737
Internal Medicine - Hematology & Oncology in Milwaukee, WI
About Magdalena Flejsierowicz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAGDALENA FLEJSIEROWICZ MD (NPI 1144246737) is an individual hematology & oncology provider in Milwaukee, Wisconsin, licensed in Wisconsin (39044) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS, is affiliated with Aurora St Lukes Medical Center, and is a graduate of Other (1992).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Magdalena Flejsierowicz Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Magdalena Flejsierowicz reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukee, WI 53215
- Reassigned Medicare billing, Wisconsin enrollment
- 4,609 clinicians in this Medicare group
Milwaukee, WI 53215
- Reassigned Medicare billing, Wisconsin enrollment
- 297 clinicians in this Medicare group
Milwaukee, WI 53209
- Reassigned Medicare billing, Wisconsin enrollment
- 1,615 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Aurora St Lukes Medical Center
Acute Care Hospitals · Milwaukee, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53233 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MILWAUKEE, WI 53233
MILWAUKEE, WI 53233
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Magdalena Flejsierowicz's NPI number?
The NPI number for Magdalena Flejsierowicz is 1144246737. It was assigned to this individual provider in the NPPES registry on July 15, 2006.
Where is Magdalena Flejsierowicz located?
Magdalena Flejsierowicz practices at 1218 W Kilbourn Ave Suite 200, Milwaukee, WI 53233. The listed phone number is (414) 219-7370.
What is Magdalena Flejsierowicz's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Magdalena Flejsierowicz enrolled in Medicare?
Yes. Magdalena Flejsierowicz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Magdalena Flejsierowicz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Magdalena Flejsierowicz reassigns Medicare benefits to 3 organizations: Aurora Medical Group, Inc. (Milwaukee, WI), Aurora Health Care Metro, Inc. (Milwaukee, WI) and Aurora Advanced Healthcare, Inc. (Milwaukee, WI). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Magdalena Flejsierowicz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Magdalena Flejsierowicz accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare), HealthPartners and Quartz and 1 other insurer list Magdalena Flejsierowicz as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Magdalena Flejsierowicz affiliated with any hospitals?
According to CMS data, Magdalena Flejsierowicz is affiliated with Aurora St Lukes Medical Center.
When was this NPI record last updated?
The NPPES record for Magdalena Flejsierowicz was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Magdalena Flejsierowicz, MD · NPI 1144246737
Hematology & Oncology physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since July 15, 2006.
## Identity
- **NPI:** 1144246737 (Entity type: Individual)
- **Enumerated:** July 15, 2006
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 39044 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1218 W KILBOURN AVE, SUITE 200, Milwaukee, WI 53233-1330
- **Phone:** (414) 219-7370
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Aurora Medical Group, Inc. (NPI 1427271378, Milwaukee, WI); Aurora Health Care Metro, Inc. (NPI 1861447179, Milwaukee, WI); Aurora Advanced Healthcare, Inc. (NPI 1265629133, Milwaukee, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1992
## Record status
- **NPPES last updated:** September 29, 2026
- **Other identifiers:** Medicaid 32555100 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1144246737) · Data from the CMS NPPES public registry.