ALEXANDRA ERNST MD, MPH
NPI 1144845900
Orthopaedic Surgery in Milwaukee, WI
About Alexandra Ernst Md, Mph NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDRA ERNST MD, MPH (NPI 1144845900) is an individual orthopaedic surgery provider in Milwaukee, Wisconsin, licensed in Wisconsin (87965-020) and active in the NPI registry since June 2020. She is enrolled in Medicare PECOS, is affiliated with Renown Regional Medical Center, and is a graduate of Emory University School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses 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 Ernst 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 Reassignments
2Medicare enrollment records show Alexandra Ernst reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fernley, NV 89408
- Reassigned Medicare billing, Nevada enrollment
- 75 clinicians in this Medicare group
Sacramento, CA 95817
- Reassigned Medicare billing, California enrollment
- 2,570 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Renown Regional Medical Center
Acute Care Hospitals · Reno, NVPhysician 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.
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 Ernst's NPI number?
The NPI number for Alexandra Ernst is 1144845900. It was assigned to this individual provider in the NPPES registry on June 8, 2020.
Where is Alexandra Ernst located?
Alexandra Ernst practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. The listed phone number is (414) 805-7400.
What is Alexandra Ernst's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Alexandra Ernst enrolled in Medicare?
Yes. Alexandra Ernst 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 Alexandra Ernst's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Ernst reassigns Medicare benefits to 2 organizations: Reno Orthopaedic Clinic, Ltd (Fernley, NV) and Regents Of The Univ Of Ca (Sacramento, CA). 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 Alexandra Ernst's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alexandra Ernst accept?
Health plans from Anthem Blue Cross and Blue Shield and Network Health list Alexandra Ernst 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 Ernst affiliated with any hospitals?
According to CMS data, Alexandra Ernst is affiliated with Renown Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Alexandra Ernst was last updated on September 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 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 Ernst, MD, MPH · NPI 1144845900
Orthopaedic Surgery physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since June 8, 2020.
## Identity
- **NPI:** 1144845900 (Entity type: Individual)
- **Enumerated:** June 8, 2020
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **State license:** 87965-020 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 9200 W WISCONSIN AVE, Milwaukee, WI 53226-3522
- **Phone:** (414) 805-7400 · **Fax:** (414) 805-7388
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Reno Orthopaedic Clinic, Ltd (NPI 1619839727, Fernley, NV); Regents Of The Univ Of Ca (NPI 1285068783, Sacramento, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Emory University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** September 30, 2026
- **Other identifiers:** Medicaid 1144845900 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1144845900) · Data from the CMS NPPES public registry.