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

Gregory V Warren, MD

Individual provider Nephrology Physician · NPI 1649262544

Gregory V Warren, MD is a Nephrology Physician in Milwaukee, Wisconsin. Practices as a sole proprietor. Licensed in Wisconsin.

Licensed in
WI
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

3120 S 27th St
Milwaukee, WI 53215
Phone: (414) 672-8282
Fax: (414) 672-8284
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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 26514 (WI)

Record details

NPI number1649262544
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 17, 2005
Last updated in NPPESDecember 9, 2021
Certification dateDecember 9, 2021

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 patients195
Services billed 466 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

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