Quick answers
- Does Elizabeth Nielsen accept Medicare assignment?
- Yes. Medicare's clinician data says Elizabeth Nielsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Elizabeth Nielsen see?
- In 2024, CMS data shows 164 Original Medicare patients and 365 services for Elizabeth Nielsen. This counts Original Medicare only and measures volume, not quality.
- What is Elizabeth Nielsen's NPI number?
- 1861842007. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Elizabeth Nielsen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 164 |
|---|---|
| Services billed to Medicare | 365 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Critical care, first 30-74 minutes (99291)160 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)91 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)42 services
- Critical care, each additional 30 minutes (99292)22 services
- Irrigation and suction of lung airways to obtain cells using an endoscope (31624)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease55%
- Heart failure53%
- Chronic kidney disease49%
- Arthritis46%
Hospitals where Elizabeth Nielsen works
Medicare's Facility Affiliation Data lists Elizabeth Nielsen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ascension Columbia St Marys Hospital MilwaukeeMilwaukee, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520051
- Oconomowoc Memorial HospitalOconomowoc, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520062
- Waukesha Memorial HospitalWaukesha, WI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 520008
Practice locations
Addresses where Elizabeth Nielsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 19475 W N AveBrookfield, WI 53045 (414) 453‑7418
- 2301 N Lake DrMilwaukee, WI 53211 (414) 585‑1000
- 725 American AveWaukesha, WI 53188 (262) 928‑7276
Group practices
Medicare enrollment lists Elizabeth Nielsen as a member of these groups (CMS data updated October 2, 2026).
- Prohealth Medical Group Inc479 clinicians in the group
- Midwest Critical Care SC48 clinicians in the group
Specialties
- Hospice/Palliative Careprimary
- Internal Medicinealso
Other palliative care doctors in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Other clinicians in Prohealth Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1861842007 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians