ALEXANDRA C ISTL MD MPH
NPI 1477168961
Surgery - Surgical Oncology in Milwaukee, WI
About Alexandra C Istl Md Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDRA C ISTL MD MPH (NPI 1477168961) is an individual surgical oncology provider in Milwaukee, Wisconsin, licensed in Wisconsin (81092) and active in the NPI registry since September 2020. She is enrolled in Medicare PECOS, is affiliated with Froedtert Memorial Lutheran Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
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
Alexandra C Istl Md Mph 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 Reassignment
Medicare enrollment records show Alexandra Istl reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 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 3
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Froedtert Memorial Lutheran Hospital
Acute Care Hospitals · Milwaukee, WIFroedtert Community Hospital
Acute Care Hospitals · New Berlin, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53226 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
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 Alexandra Istl's NPI number?
The NPI number for Alexandra Istl is 1477168961. It was assigned to this individual provider in the NPPES registry on September 10, 2020.
Where is Alexandra Istl located?
Alexandra Istl practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. The listed phone number is (414) 955-1400.
What is Alexandra Istl's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Oncology, with taxonomy code 2086X0206X.
Is Alexandra Istl enrolled in Medicare?
Yes. Alexandra Istl 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 organization bills Medicare for Alexandra Istl's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Istl reassigns Medicare benefits to The Medical College Of Wisconsin, Inc. (Milwaukee, WI). The 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 Alexandra Istl's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alexandra Istl accept?
Health plans from Aspirus Health Plan list Alexandra Istl 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 Alexandra Istl affiliated with any hospitals?
According to CMS data, Alexandra Istl is affiliated with Froedtert Memorial Lutheran Hospital and Froedtert Community Hospital.
When was this NPI record last updated?
The NPPES record for Alexandra Istl was last updated on September 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 37 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.
# Alexandra C Istl, MD MPH · NPI 1477168961
Surgical Oncology physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since September 10, 2020.
## Identity
- **NPI:** 1477168961 (Entity type: Individual)
- **Enumerated:** September 10, 2020
- **Primary specialty:** Surgery - Surgical Oncology · taxonomy 2086X0206X
- **State license:** 81092 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 9200 W WISCONSIN AVE, Milwaukee, WI 53226-3522
- **Phone:** (414) 955-1400 · **Fax:** (414) 955-0197
## 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:** The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** September 17, 2026
- **Other identifiers:** Medicaid 1477168961 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1477168961) · Data from the CMS NPPES public registry.