Dr Gregory Wayne Grzesik, DO - Medicare Hospitalist in Weston, WI

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Dr Gregory Wayne Grzesik, DO is a medicare enrolled "Hospitalist" physician in Weston, Wisconsin. He went to Lake Erie College Of Osteopathic Medicine, Erie and graduated in 2013 and has 12 years of diverse experience with area of expertise as Hospitalist. He is a member of the group practice Mchs Hospitals Inc and his current practice location is 3400 Ministry Pkwy, Weston, Wisconsin. You can reach out to his office (for appointments etc.) via phone at (715) 393-1220.

Dr Gregory Wayne Grzesik is licensed to practice in Wisconsin (license number 65797) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1316389372.

Contact Information

Dr Gregory Wayne Grzesik, DO
3400 Ministry Pkwy,
Weston, WI 54476-5220
(715) 393-1220
Not Available

Map and Direction




Physician's Profile

Full NameDr Gregory Wayne Grzesik
GenderMale
SpecialityHospitalist
Experience12 Years
Location3400 Ministry Pkwy, Weston, Wisconsin
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Gregory Wayne Grzesik attended and graduated from Lake Erie College Of Osteopathic Medicine, Erie in 2013
  NPI Data:
  • NPI Number: 1316389372
  • Provider Enumeration Date: 07/18/2013
  • Last Update Date: 06/18/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 2961706643
  • Enrollment ID: I20160705002027

Medical Identifiers

Medical identifiers for Dr Gregory Wayne Grzesik such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1316389372NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 65797-21 (Wisconsin)Secondary
207R00000XInternal Medicine 125-062888 (Illinois)Secondary
208M00000XHospitalist 65797 (Wisconsin)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ascension St Clares HospitalWeston, WIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mchs Hospitals Inc56980711731045

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Gregory Wayne Grzesik allows following entities to bill medicare on his behalf.
Entity NameMarshfield Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952347981
PECOS PAC ID: 2264345206
Enrollment ID: O20031106000590
Entity NameBeaver Dam Community Hospitals Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1972188555
PECOS PAC ID: 2567370539
Enrollment ID: O20040210000666
Entity NameMemorial Hospital Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346239373
PECOS PAC ID: 2365433224
Enrollment ID: O20040519001426
Entity NameFlambeau Hospital, Inc.
Entity TypePart A Provider - Critical Access Hospital
Entity IdentifiersNPI Number: 1700963048
PECOS PAC ID: 9032029871
Enrollment ID: O20070828000478
Entity NameMemorial Hospital Inc
Entity TypePart A Provider - Critical Access Hospital
Entity IdentifiersNPI Number: 1346239373
PECOS PAC ID: 2365433224
Enrollment ID: O20110526000807
Entity NameMchs Hospitals Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1093221434
PECOS PAC ID: 5698071173
Enrollment ID: O20180208000096
Entity NameLakeview Medical Center Inc Of Rice Lake
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1093201832
PECOS PAC ID: 6103737820
Enrollment ID: O20180817001484
Entity NameMchs Hospitals Inc
Entity TypePart A Provider - Critical Access Hospital
Entity IdentifiersNPI Number: 1952890873
PECOS PAC ID: 5698071173
Enrollment ID: O20180904002962
Entity NameFlambeau Hospital, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1194317966
PECOS PAC ID: 9032029871
Enrollment ID: O20210409000059

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Gregory Wayne Grzesik is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Gregory Wayne Grzesik, DO
1000 N Oak Ave,
Marshfield, WI 54449-5702

Ph: (715) 387-5511		Dr Gregory Wayne Grzesik, DO
3400 Ministry Pkwy,
Weston, WI 54476-5220

Ph: (715) 393-1220

Reviews and Comments


Hospitalist Doctors in Weston, WI

Krzysztof Rus, M.D.
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-3000    
Navid A Majid, MD
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-3000    
Dr. Jerzy Sikora, M.D.
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-3000    
Marcus R Sepnafski, MD
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-1000    
Abuzaid Abbas Alawad Medani, MD
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-389-5127    
Charlene Sealy, MD
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-3000    
Dr. Olusolape Ajibola Adegbehingbe, M.D
Hospitalist
Medicare: Accepting Medicare Assignments
Practice Location: 3400 Ministry Pkwy, Weston, WI 54476
Phone: 715-393-3000    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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