William B Seiden, MD - Medicare Internal Medicine in Lake Forest, IL

William B Seiden, MD is a medicare enrolled "Internal Medicine" physician in Lake Forest, Illinois. He went to University Of Illinois College Of Med (chi/peor/rock/chm-urb) and graduated in 1990 and has 34 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Legacy Healthcare Services Inc, Physiotherapy Associates Inc, Northwestern Medical Faculty Foundation and his current practice location is 800 N Westmoreland Rd Ste 201, Lake Forest, Illinois. You can reach out to his office (for appointments etc.) via phone at (608) 242-6850.

William B Seiden is licensed to practice in Wisconsin (license number 63951) 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 1407915978.

Contact Information

William B Seiden, MD
800 N Westmoreland Rd Ste 201,
Lake Forest, IL 60045-1687
(608) 242-6850
Not Available

Map and Direction




Physician's Profile

Full NameWilliam B Seiden
GenderMale
SpecialityInternal Medicine
Experience34 Years
Location800 N Westmoreland Rd Ste 201, Lake Forest, Illinois
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:
  • William B Seiden attended and graduated from University Of Illinois College Of Med (chi/peor/rock/chm-urb) in 1990
  NPI Data:
  • NPI Number: 1407915978
  • Provider Enumeration Date: 12/08/2006
  • Last Update Date: 07/21/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 9436180320
  • Enrollment ID: I20050831000032

Medical Identifiers

Medical identifiers for William B Seiden such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1407915978NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 036086127 (Illinois)Secondary
207R00000XInternal Medicine 63951 (Wisconsin)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Northwestern Lake Forest HospitalLake forest, ILHospital
Northwestern Memorial HospitalChicago, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Legacy Healthcare Services Inc21633397223341
Physiotherapy Associates Inc3577470442503
Northwestern Medical Faculty Foundation45875768143352

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. William B Seiden allows following entities to bill medicare on his behalf.
Entity NameNorthwestern Medical Faculty Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1346235314
PECOS PAC ID: 4587576814
Enrollment ID: O20031105000541

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. William B Seiden 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
William B Seiden, MD
680 N Lake Shore Dr,
Chicago, IL 60611-4546

Ph: (312) 695-6868
William B Seiden, MD
800 N Westmoreland Rd Ste 201,
Lake Forest, IL 60045-1687

Ph: (608) 242-6850

Reviews and Comments


Internal Medicine Doctors in Lake Forest, IL

Dr. Jason T Garti, M.D.
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Jennifer M Nguyen, MD
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Phone: 847-295-5729    Fax: 847-295-5700
Dr. Denise Verges, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 900 N Westmoreland Rd, Suite 222, Lake Forest, IL 60045
Phone: 847-234-6121    

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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