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

Gregory H Downer, MD

Individual provider Nephrology Physician · NPI 1285635367

Gregory H Downer, MD practises Nephrology in Muskegon, Michigan. Graduated from Indiana University School of Medicine in 1981, 45 years ago. Practices with West Michigan Nephrology PLLC, an 8-clinician group and accepts Medicare assignment. Licensed in Michigan.

Years since qualifying
45
Trained at
Indiana University School of Medicine
Licensed in
MI
In the registry since
2005
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

1250 Mercy Dr Ste 101
Muskegon, MI 49444-1881 Not confirmed with CMS for 12 years — call before visiting
Phone: (231) 733-1912
Fax: (231) 737-4603
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence 4301048039 (MI)

Record details

NPI number1285635367
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2005
Last updated in NPPESFebruary 17, 2014

Medicare enrollment

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

Medicare specialtyNEPHROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1981 (45 years in practice)
Group practice West Michigan Nephrology Pllc — 8 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients379
Services billed 888 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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 $86 3 payments · 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. Those with a page here are linked.

  • Spectrum Health Hospital · Grand Rapids, MI · listed as Spectrum Health Hospital
  • DaVita Apple Avenue Dialysis Dialysis facility · Muskegon, MI · listed as Blanco Dialysis LLC
  • DaVita Ludington Dialysis Dialysis facility · Ludington, MI · listed as DVA Renal Healthcare Inc
  • DaVita Muskegon Dialysis Dialysis facility · Muskegon, MI · listed as DVA Renal Healthcare Inc
  • DaVita PDI-Grand Haven Dialysis facility · Grand Haven, MI · listed as Physicians Dialysis Acquisitions Inc
  • Corewell Health Gerber Hospital Hospital · Fremont, MI
  • Corewell Health Ludington Hospital Hospital · Ludington, MI
  • Mercy Health Lakeshore Campus Hospital · Shelby, MI
  • Trinity Health Muskegon Hospital Hospital · Muskegon, MI

Also affiliated with 1 dialysis facility, which CMS identifies by certification number only.

Colleagues at West Michigan Nephrology PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Muskegon