David Williams, MD - Medicare Emergency Medicine in Chicago, IL

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David Williams, MD is a medicare enrolled "Emergency Medicine" physician in Chicago, Illinois. He went to Harvard Medical School and graduated in 1991 and has 33 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Crandon Emergency Physicians Llc and his current practice location is 4801 S Drexel Blvd, Chicago, Illinois. You can reach out to his office (for appointments etc.) via phone at (708) 229-9500.

David Williams is licensed to practice in Pennsylvania (license number MD447590) 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 1356325328.

Contact Information

David Williams, MD
4801 S Drexel Blvd,
Chicago, IL 60615-1703
(708) 229-9500
Not Available

Map and Direction




Physician's Profile

Full NameDavid Williams
GenderMale
SpecialityEmergency Medicine
Experience33 Years
Location4801 S Drexel Blvd, Chicago, 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:
  • David Williams attended and graduated from Harvard Medical School in 1991
  NPI Data:
  • NPI Number: 1356325328
  • Provider Enumeration Date: 12/02/2005
  • Last Update Date: 05/29/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 5395796197
  • Enrollment ID: I20050209000696

Medical Identifiers

Medical identifiers for David Williams such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1356325328NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 036.087673 (Illinois)Secondary
207PE0004XEmergency Medicine - Emergency Medical Services 036087673 (Illinois)Secondary
207P00000XEmergency Medicine MD447590 (Pennsylvania)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
South Shore HospitalChicago, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Crandon Emergency Physicians Llc10525788045

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. David Williams allows following entities to bill medicare on his behalf.
Entity NameAdvocate Health And Hospitals Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1700824455
PECOS PAC ID: 7810800935
Enrollment ID: O20031106000064
Entity NameCrandon Emergency Physicians Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1376582783
PECOS PAC ID: 1052578804
Enrollment ID: O20120206000570
Entity NameCepamerica Illinois Llp
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1912283110
PECOS PAC ID: 3274793633
Enrollment ID: O20120322000587
Entity NameAurora Emergency Physicians Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1407379423
PECOS PAC ID: 1850657180
Enrollment ID: O20171102000998

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. David 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
David Williams, MD
4801 S Drexel Blvd,
Chicago, IL 60615-1703

Ph: () -		David Williams, MD
4801 S Drexel Blvd,
Chicago, IL 60615-1703

Ph: (708) 229-9500

Reviews and Comments


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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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