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

MS. Kristi Kay Grutzmacher, APNP

Individual provider Family Medicine Physician · NPI 1669887246

MS. Kristi Kay Grutzmacher, APNP is a Nurse Practitioner in Waukesha, Wisconsin. Qualified in 2013, 13 years ago. Practices with Oak Medical SC, a 123-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
13
Licensed in
WI
In the registry since
2014
Specialties on file
2
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Practice location Address checks out

N20W22961 Watertown Rd
Waukesha, WI 53186-1306
Phone: (262) 875-5070
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 5824-33 (WI)
Family Medicine Physician Taxonomy 207Q00000X · Licence 5824 (WI)

Record details

NPI number1669887246
Entity typeIndividual (Type 1)
GenderFemale
Credentials APNP
Sole proprietorYes
NPI enumeratedJune 23, 2014
Last updated in NPPESJanuary 13, 2025
Certification dateJanuary 13, 2025

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Oak Medical Sc — 123 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 patients195
Services billed 757 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Colleagues at Oak Medical SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 123 clinicians in the practice; 12 are shown here.

Other providers in Waukesha