Grazyna Joanna Siwy, MD - Medicare General Practice in Chicago, IL

Grazyna Joanna Siwy, MD is a medicare enrolled "Internal Medicine" physician in Chicago, Illinois. She graduated from medical school in 1998 and has 26 years of diverse experience with area of expertise as General Practice. She is a member of the group practice Cook County and her current practice location is 1901 W Harrison St, Chicago, Illinois. You can reach out to her office (for appointments etc.) via phone at (312) 864-6000.

Grazyna Joanna Siwy is licensed to practice in Illinois (license number 036122386) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1447498910.

Contact Information

Grazyna Joanna Siwy, MD
1901 W Harrison St,
Chicago, IL 60612-3714
(312) 864-6000
Not Available

Map and Direction




Physician's Profile

Full NameGrazyna Joanna Siwy
GenderFemale
SpecialityGeneral Practice
Experience26 Years
Location1901 W Harrison St, Chicago, Illinois
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Grazyna Joanna Siwy graduated from medical school in 1998
  NPI Data:
  • NPI Number: 1447498910
  • Provider Enumeration Date: 01/22/2009
  • Last Update Date: 04/30/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 9032390828
  • Enrollment ID: I20110228000336

Medical Identifiers

Medical identifiers for Grazyna Joanna Siwy such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1447498910NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 036122386 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
John H Stroger Jr HospitalChicago, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Cook County2860398088645

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. Grazyna Joanna Siwy allows following entities to bill medicare on her behalf.
Entity NameCook County
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1588612832
PECOS PAC ID: 2860398088
Enrollment ID: O20031209000747

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. Grazyna Joanna Siwy 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
Grazyna Joanna Siwy, MD
8644 W Stolting Rd,
Niles, IL 60714-1817

Ph: (847) 692-2377
Grazyna Joanna Siwy, MD
1901 W Harrison St,
Chicago, IL 60612-3714

Ph: (312) 864-6000

Reviews and Comments


Internal Medicine Doctors in Chicago, IL

Dr. Sorin C Danciu, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3134 N Clark St, Chicago, IL 60657
Phone: 773-880-9722    
Anoopa A. Koshy, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 259 E Erie St Ste 2200, Chicago, IL 60611
Phone: 312-926-6000    
William Edmond Gerardi, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 3730 N Lake Shore Dr, Apartment 2a, Chicago, IL 60613
Phone: 773-244-3060    
Suparna Dutta, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1700 W Van Buren St, Suite 500, Chicago, IL 60612
Phone: 312-942-4200    Fax: 312-942-3568
Alexandra Dumitrescu,
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 5841 S Maryland Ave, Chicago, IL 60637
Phone: 888-824-0200    
Dr. Mitesh Mahesh Kabadi, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1725 W Harrison St Ste 1159, Chicago, IL 60612
Phone: 312-942-5020    
Dr. Marta Batus, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1725 W Harrison St, Suite 809, Chicago, IL 60612
Phone: 312-563-2487    Fax: 312-942-3192

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).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.