DR. GREGORY WAYNE GRZESIK D.O.
NPI 1316389372
Hospitalist in Weston, WI
About Dr. Gregory Wayne Grzesik D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY WAYNE GRZESIK D.O. (NPI 1316389372) is an individual hospitalist provider in Weston, Wisconsin, licensed in Wisconsin (65797) and active in the NPI registry since July 2013. He is enrolled in Medicare PECOS, is affiliated with Marshfield Medical Center - Rice Lake, and maintains a secondary practice location in Rhinelander.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gregory Wayne Grzesik D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marshfield Medical Center - Rice Lake
Acute Care Hospitals · Rice Lake, WIMarshfield Medical Center
Acute Care Hospitals · Marshfield, WIMarshfield Medical Center - Weston
Acute Care Hospitals · Weston, WIMarshfield Medical Center - Minocqua
Acute Care Hospitals · Minocqua, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54476 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WESTON, WI 54476
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Gregory Grzesik's NPI number?
The NPI number for Gregory Grzesik is 1316389372. It was assigned to this individual provider in the NPPES registry on July 18, 2013.
Where is Gregory Grzesik located?
Gregory Grzesik practices at 3400 Ministry Pkwy, Weston, WI 54476. The listed phone number is (715) 393-1220.
What is Gregory Grzesik's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Gregory Grzesik enrolled in Medicare?
Yes. Gregory Grzesik is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does Gregory Grzesik accept?
Health plans from Medica list Gregory Grzesik as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Gregory Grzesik affiliated with any hospitals?
According to CMS data, Gregory Grzesik is affiliated with Marshfield Medical Center - Rice Lake, Marshfield Medical Center, Marshfield Medical Center - Weston and Marshfield Medical Center - Minocqua.
When was this NPI record last updated?
The NPPES record for Gregory Grzesik was last updated on June 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
