WILLIAM A CHADWICK (M.D.) – Obstetrics & Gynecology Physician, NPI 1568454775
Obstetrics & Gynecology Physician
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Profile Insights
NPPES metrics only — not quality of care.
1,923 OBSTETRICS/GYNECOLOGY in IL
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Provider Addresses for WILLIAM A CHADWICK (M.D.)
4600, Memorial Drive, Royal Heights, Belleville, Saint Clair County, Illinois, 62226, United States
SUITE 400
BELLEVILLE, IL 622265366
Phone: (618) 234-2390
Fax: (618) 234-9936
Type: Location
4600 MEMORIAL DR STE 240
BELLEVILLE, IL 622265363
Phone: (618) 234-2390
Fax: (618) 234-9936
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 22 Open Payments records for all available years, with a total value of $481.
Total Amount is formed as General ($481) + Research ($0) + Ownership ($0) = $481.
Last reported payment date: 2024-11-19 • Largest payer in this snapshot: Astellas Pharma US Inc ($168).
Total Amount
$481
General + Research + Ownership
Payments
22
Total payment records
General Amount
$481
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Astellas Pharma US Inc | $168 |
| Sumitomo Pharma America, Inc. | $67 |
| Meditrina | $51 |
| Organon LLC | $49 |
| Minerva Surgical, Inc | $34 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-05-10
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040510000876 | I | Obstetrics/Gynecology | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 167 | 115 | $0 |
| G0101 | Cervical or vaginal cancer screening; pelvic and clinical breast examination | 108 | 108 | $0 |
| Q0091 | Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory | 47 | 47 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 32 | 32 | $0 |
Insurance plans in this area (ZIP 62226)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| OBSTETRICS/GYNECOLOGY | IL | 81002 | Urinalysis, manual test | 17 | 15 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Physician Assistant | IL | |
| Family Practice | IL | |
| - | MO | |
| O B S T E T R I C S/ G Y N E C O L O G Y | MO | |
| G A S T R O E N T E R O L O G Y | GA | |
| Physician Assistant | IL | |
| - | MO | |
| Gastroenterology, Gastroenterology, Internal Medicine | OH |
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