William A Chadwick, MD - Medicare Obstetrics/gynecology in Belleville, IL

William A Chadwick, MD is a medicare enrolled "Obstetrics & Gynecology" physician in Belleville, Illinois. He graduated from medical school in 1985 and has 39 years of diverse experience with area of expertise as Obstetrics/gynecology. He is a member of the group practice Fairview Heights Medical Group Sc and his current practice location is 4600 Memorial Dr Ste 240, Belleville, Illinois. You can reach out to his office (for appointments etc.) via phone at (618) 234-2390.

William A Chadwick is licensed to practice in Illinois (license number 036-082912) 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 1568454775.

Contact Information

William A Chadwick, MD
4600 Memorial Dr Ste 240,
Belleville, IL 62226-5363
(618) 234-2390
(618) 234-9936

Map and Direction




Physician's Profile

Full NameWilliam A Chadwick
GenderMale
SpecialityObstetrics/gynecology
Experience39 Years
Location4600 Memorial Dr Ste 240, Belleville, 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 A Chadwick graduated from medical school in 1985
  NPI Data:
  • NPI Number: 1568454775
  • Provider Enumeration Date: 08/16/2005
  • Last Update Date: 02/12/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 2365349172
  • Enrollment ID: I20040510000876

Medical Identifiers

Medical identifiers for William A Chadwick such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1568454775NPI-NPPES
1568454775MedicaidIL

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207V00000XObstetrics & Gynecology 036-082912 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Memorial HospitalBelleville, ILHospital
Hshs St Elizabeth's HospitalO fallon, ILHospital
Barnes Jewish HospitalSaint louis, MOHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Fairview Heights Medical Group Sc6800784083342

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 A Chadwick allows following entities to bill medicare on his behalf.
Entity NameFairview Heights Medical Group Sc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1679503668
PECOS PAC ID: 6800784083
Enrollment ID: O20040309000650

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 A Chadwick 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 A Chadwick, MD
4600 Memorial Dr, Suite 400,
Belleville, IL 62226-5366

Ph: (618) 234-2390
William A Chadwick, MD
4600 Memorial Dr Ste 240,
Belleville, IL 62226-5363

Ph: (618) 234-2390

Reviews and Comments


Obstetrics & Gynecology Doctors in Belleville, IL

Dr. Frank F Mussemann, M.D.
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 180 S 3rd St, Suite 200, Belleville, IL 62220
Phone: 618-233-0017    Fax: 618-233-0251
Dr. Michael E Herrmann, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 2900 Frank Scott Pkwy W, Suite 966, Belleville, IL 62223
Phone: 618-235-8600    Fax: 618-235-8869
Dr. Dwight William O'dell, M.D.
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 4550 Memorial Dr, Ste 200, Belleville, IL 62226
Phone: 618-233-5998    Fax: 618-233-6001
Dr. Helen Mussemann, M.D.
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 180 S 3rd St, Suite 200, Belleville, IL 62220
Phone: 618-233-0017    Fax: 618-233-0251
James Hobby, MD
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 7210 W Main St, Belleville, IL 62223
Phone: 618-398-8840    
Walter J Yee, D.O.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 7210 W Main St, Belleville, IL 62223
Phone: 618-394-0712    Fax: 618-394-1346
John A. Hucker, M.D.
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 340 W Lincoln St, Ste 560, Belleville, IL 62220
Phone: 618-355-7745    Fax: 618-355-7759

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.