Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Amber Marie Demerath, NP

Individual provider Nurse Practitioner · NPI 1356072417

Amber Marie Demerath, NP is a Nurse Practitioner in Neenah, Wisconsin. Qualified in 2021, 5 years ago. Practices with Fox Valley Nephrology Partners S C, a 12-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
5
Licensed in
WI
In the registry since
2022
What do these letters mean?
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

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Practice location Address checks out

300 N Commercial St # 300
Neenah, WI 54956-2619
Phone: (920) 886-0818
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 670 Cormier Rd, Green Bay, WI 54304-4824 — (920) 496-4700

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 11954-33 (WI)

Record details

NPI number1356072417
Entity typeIndividual (Type 1)
GenderFemale
Credentials NP
Sole proprietorNo
NPI enumeratedJune 20, 2022
Last updated in NPPESApril 23, 2024
Certification dateApril 23, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2021 (5 years in practice)
Group practice Fox Valley Nephrology Partners S C — 12 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients59
Services billed 163 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,130 40 payments · a meal or drink at a meeting or visit, not a fee
Education $41 2 payments · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Fox Valley Nephrology Partners S C

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 12 clinicians in the practice; 9 are shown here.

Other providers in Neenah