Mercedes M Williams, MD - Medicare Obstetrics & Gynecology in West Allis, WI

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Mercedes M Williams, MD is a medicare enrolled "Obstetrics & Gynecology" physician in West Allis, Wisconsin. Her current practice location is 8905 W Lincoln Ave Ste 515, West Allis, Wisconsin. You can reach out to her office (for appointments etc.) via phone at (414) 328-8650.

Mercedes M Williams is licensed to practice in Wisconsin (license number 74044) 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 1558866079.

Contact Information

Mercedes M Williams, MD
8905 W Lincoln Ave Ste 515,
West Allis, WI 53227-2470
(414) 328-8650
(414) 328-8660

Map and Direction




Physician's Profile

Full NameMercedes M Williams
GenderFemale
SpecialityObstetrics & Gynecology
Location8905 W Lincoln Ave Ste 515, West Allis, Wisconsin
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1558866079
  • Provider Enumeration Date: 03/27/2018
  • Last Update Date: 07/19/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 8123379583
  • Enrollment ID: I20220801001083

Medical Identifiers

Medical identifiers for Mercedes M Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1558866079NPI-NPPES
100205972MedicaidWI

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207V00000XObstetrics & Gynecology 74044 (Wisconsin)Primary
390200000XStudent In An Organized Health Care Education/training Program (Oregon)Secondary

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. Mercedes M Williams allows following entities to bill medicare on her behalf.
Entity NameDean Health Systems Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1053358846
PECOS PAC ID: 7012827983
Enrollment ID: O20031105000584
Entity NameAurora Medical Group, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1427271378
PECOS PAC ID: 6709794258
Enrollment ID: O20031105000725
Entity NameLakeshore Medical Clinic Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1003861188
PECOS PAC ID: 7719890730
Enrollment ID: O20031106000481

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. Mercedes M Williams 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
Mercedes M Williams, MD
Po Box 735044,
Chicago, IL 60673-5044

Ph: (800) 326-2250		Mercedes M Williams, MD
8905 W Lincoln Ave Ste 515,
West Allis, WI 53227-2470

Ph: (414) 328-8650

Reviews and Comments


Obstetrics & Gynecology Doctors in West Allis, WI

Aida Shanti, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8901 W Lincoln Ave, West Allis, WI 53227
Phone: 414-329-4300    
Karen E. Dobbs, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8905 W Lincoln Ave, Suite 501, West Allis, WI 53227
Phone: 414-978-2229    Fax: 414-978-2279
Stacy Michelle Syrcle, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8905 W Lincoln Ave, Suite 501, West Allis, WI 53227
Phone: 414-978-2229    Fax: 414-978-2279
Scott A Kamelle, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8905 W Lincoln Ave, West Allis, WI 53227
Phone: 414-329-5651    
Roa Qato, M.D.
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 555 S 108th St, West Allis, WI 53214
Phone: 414-566-6400    
Lisa B. Lloyd,
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8905 W Lincoln Ave, Suite 501, West Allis, WI 53227
Phone: 414-978-2229    Fax: 414-978-2279
Amarjit S. Jaglan, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 8905 W Lincoln Ave, Suite 501, West Allis, WI 53227
Phone: 414-978-2229    Fax: 414-978-2279

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.