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

Individual provider Internal Medicine Physician · NPI 1861951725

Ryan David Guerrettaz, MD is an Internal Medicine Physician in Milwaukee, Wisconsin. Licensed in Illinois and Wisconsin. Registered with an NPI since 2019.

Licensed in
IL, WI
In the registry since
2019
Specialties on file
3
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

8701 Watertown Plank Rd
Milwaukee, WI 53226-3548
Phone: (414) 955-4575
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Hematology & Oncology Physician (primary) Taxonomy 2080P0207X · Licence 81491-20 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125.074606 (IL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1861951725
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 19, 2019
Last updated in NPPESJune 26, 2023
Certification dateJune 26, 2023

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