Dr Margaret K Williamson, MD - Medicare Emergency Medicine in Oak Lawn, IL

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Dr Margaret K Williamson, MD is a medicare enrolled "Emergency Medicine" physician in Oak Lawn, Illinois. Her current practice location is 4440 W 95th St, Oak Lawn, Illinois. You can reach out to her office (for appointments etc.) via phone at (434) 466-2969.

Dr Margaret K Williamson is licensed to practice in Illinois (license number 036126342) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1154514867.

Contact Information

Dr Margaret K Williamson, MD
4440 W 95th St,
Oak Lawn, IL 60453-2600
(434) 466-2969
Not Available

Map and Direction




Physician's Profile

Full NameDr Margaret K Williamson
GenderFemale
SpecialityEmergency Medicine
Location4440 W 95th St, Oak Lawn, Illinois
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1154514867
  • Provider Enumeration Date: 08/26/2007
  • Last Update Date: 03/12/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 0446420384
  • Enrollment ID: I20110831000604

Medical Identifiers

Medical identifiers for Dr Margaret K Williamson such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1154514867NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 125-052545 (Illinois)Secondary
207P00000XEmergency Medicine 036126342 (Illinois)Primary

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 Margaret K Williamson allows following entities to bill medicare on her behalf.
Entity NameNorthwestern Medical Faculty Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346235314
PECOS PAC ID: 4587576814
Enrollment ID: O20031105000541
Entity NameAdvocate Health And Hospitals Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1700824455
PECOS PAC ID: 7810800935
Enrollment ID: O20031106000064

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 Margaret K Williamson 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 Margaret K Williamson, MD
29373 Network Pl,
Chicago, IL 60673-1293

Ph: (847) 390-5900		Dr Margaret K Williamson, MD
4440 W 95th St,
Oak Lawn, IL 60453-2600

Ph: (434) 466-2969

Reviews and Comments


Emergency Medicine Doctors in Oak Lawn, IL

Michael Cirone, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-684-5375    Fax: 708-684-1028
Peter Peraud, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-684-4077    
Dr. Thomas Kevin Seagraves, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-283-5500    
Dr. Timothy Koplik Henderson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-684-5375    
Elizabeth Kunjummen, DO
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-283-5500    
Ms. Meghan Maureen Hurley, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-684-5354    
Nicolas Kettaneh, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 4440 W 95th St, Oak Lawn, IL 60453
Phone: 708-684-5354    Fax: 708-684-1028

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.