Dr William Lewis Riles, MD - Medicare Internal Medicine in Chicago, IL

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Dr William Lewis Riles, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Chicago, Illinois. He went to University Of South Carolina School Of Medicine and graduated in 1998 and has 26 years of diverse experience with area of expertise as Internal Medicine. He is a member of the group practice Cook County, Freeport Memorial Hospital, Freeport Regional Health Care Foundation, Murray-calloway County Public Hospital Corporation and his current practice location is 1901 W Harrison St, Chicago, Illinois. You can reach out to his office (for appointments etc.) via phone at (312) 864-7344.

Dr William Lewis Riles is licensed to practice in Illinois (license number 036-104745) 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 1891705737.

Contact Information

Dr William Lewis Riles, MD
1901 W Harrison St,
Chicago, IL 60612-3714
(312) 864-7344
(312) 864-9624

Map and Direction




Physician's Profile

Full NameDr William Lewis Riles
GenderMale
SpecialityInternal Medicine
Experience26 Years
Location1901 W Harrison St, 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:
  • Dr William Lewis Riles attended and graduated from University Of South Carolina School Of Medicine in 1998
  NPI Data:
  • NPI Number: 1891705737
  • Provider Enumeration Date: 08/09/2006
  • Last Update Date: 03/15/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 3678572500
  • Enrollment ID: I20061204000286

Medical Identifiers

Medical identifiers for Dr William Lewis Riles such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1891705737NPI-NPPES
1891705737OtherILMEDICARE NPI

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology 036-104745 (Illinois)Primary
207R00000XInternal Medicine 036-104745 (Illinois)Secondary
207RG0100XInternal Medicine - Gastroenterology 35093 (Kentucky)Secondary
207RG0100XInternal Medicine - Gastroenterology 29567 (South Carolina)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Fhn Memorial HospitalFreeport, ILHospital
Murray-calloway County HospitalMurray, KYHospital
John H Stroger Jr HospitalChicago, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Cook County2860398088645
Freeport Memorial Hospital842695823298
Freeport Regional Health Care Foundation923404168291
Murray-calloway County Public Hospital Corporation084010329771

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 William Lewis Riles allows following entities to bill medicare on his behalf.
Entity NameFreeport Regional Health Care Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1457337016
PECOS PAC ID: 9234041682
Enrollment ID: O20031104000182
Entity NameCook County
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1588612832
PECOS PAC ID: 2860398088
Enrollment ID: O20031209000747
Entity NameFreeport Memorial Hospital
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1447228788
PECOS PAC ID: 8426958232
Enrollment ID: O20040109000305

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 William Lewis Riles 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 William Lewis Riles, MD
1901 W Harrison St,
Chicago, IL 60612-3714

Ph: (312) 864-7344		Dr William Lewis Riles, MD
1901 W Harrison St,
Chicago, IL 60612-3714

Ph: (312) 864-7344

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).

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.