WILLARD CHAMBERLIN (D.O.) – Anesthesiology Physician, NPI 1437132818
Anesthesiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,228 ANESTHESIOLOGY in MO
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Provider Addresses for WILLARD CHAMBERLIN (D.O.)
South First Capitol Drive, Saint Charles, Saint Charles County, Missouri, 63303, United States
SAINT CHARLES, MO 633012844
Phone: (314) 989-3000
Type: Location
13523 BARRETT PARKWAY DR
SUITE 210
BALLWIN, MO 630213802
Phone: (314) 775-2816
Fax: (314) 775-2821
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $50.
Total Amount is formed as General ($50) + Research ($0) + Ownership ($0) = $50.
Last reported payment date: 2024-10-04 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($50).
Total Amount
$50
General + Research + Ownership
Payments
2
Total payment records
General Amount
$50
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-04
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Merck Sharp & Dohme LLC | $50 |
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: 2010-07-28
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 |
|---|---|---|---|---|
| I20100728000207 | I | Anesthesiology | MO | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 63301)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| ANESTHESIOLOGY | MO | 36620 | Insertion of arterial catheter for blood sampling or infusion, accessed through the skin | 22 | 21 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| A N E S T H E S I O L O G Y | MO | |
| A N E S T H E S I O L O G Y | MO | |
| Certified Registered Nurse Anesthetist (Crna) | MO | |
| - | MO | |
| A N E S T H E S I O L O G Y | MO | |
| - | MO | |
| Certified Registered Nurse Anesthetist (Crna) | MO | |
| Certified Registered Nurse Anesthetist (Crna) | MO | |
| A N E S T H E S I O L O G Y | KS | |
| Certified Registered Nurse Anesthetist (Crna) | MO |
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