Quick answers
- Which hospitals does William A. Chadwick work at?
- Medicare's official clinician data lists William A. Chadwick at 3 hospitals: Barnes Jewish Hospital, HSHS St Elizabeth's Hospital and Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William A. Chadwick see patients?
- Medicare's clinician data lists 3 practice locations, including Alton, IL and Belleville, IL. Call before your visit to confirm the address.
- What is William A. Chadwick's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does William A. Chadwick accept Medicare assignment?
- Yes. Medicare's clinician data says William A. Chadwick accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William A. Chadwick?
- (618) 463-7240, as listed in official Medicare / NPI Registry data.
- What is William A. Chadwick's NPI number?
- 1568454775. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William A. Chadwick works
Medicare's Facility Affiliation Data lists William A. Chadwick at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · CCN 260032
- HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · CCN 140187
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
Practice locations
Addresses where William A. Chadwick is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Memorial DrAlton, IL 62002 (618) 463‑7240
- 4500 Memorial DrBelleville, IL 62226 (618) 257‑6220
- 4600 Memorial DrBelleville, IL 62226
Group practices
Medicare enrollment lists William A. Chadwick as a member of this group (CMS data updated 2026-10-02).
- Fairview Heights Medical Group SC444 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Alton
Clinicians with the same Medicare primary specialty in Alton, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568454775 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians