Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mariellen C Van Nieuwenhuyzen, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1477167526

Mariellen C Van Nieuwenhuyzen, MD is registered under Family Practice in Boise, Idaho. Graduated from University of California, Davis School of Medicine in 2022, 4 years ago. Practices with Walter Knox Memorial Hospital, a 21-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Idaho.

Years since qualifying
4
Trained at
University of California, Davis School of Medicine
Licensed in
ID
In the registry since
2020
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Boise, ID

No coordinates on file. Search this address in Google Maps

Additional practice locations (2)

  • 4610 X St, Sacramento, CA 95817-2200 — (707) 628-4682
  • 315 E Elm St Ste 100, Caldwell, ID 83605-4858 — (208) 459-7415

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MRM-2165 (ID)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1477167526
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 5, 2020
Last updated in NPPESJune 3, 2022
Certification dateJune 3, 2022

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF CALIFORNIA, DAVIS SCHOOL OF MEDICINE
Graduated 2022 (4 years in practice)
Group practice Walter Knox Memorial Hospital — 21 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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 $15 1 payment · a meal or drink at a meeting or visit, 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 Walter Knox Memorial Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 21 clinicians in the practice; 12 are shown here.

Other providers in Boise