STEPHEN K WILLIAMSON (M.D.) – Medical Oncology Physician, NPI 1598859183
Medical Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for STEPHEN K WILLIAMSON (M.D.)
Shawnee Mission Parkway, Westwood, Country Club Plaza, Kansas City, Jackson County, Missouri, 662205, United States
SUITE 210, MS 5003
WESTWOOD, KS 662052005
Phone: (913) 588-6029
Fax: (913) 588-4085
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 7 Open Payments records for all available years, with a total value of $1,010.
Total Amount is formed as General ($0) + Research ($1,010) + Ownership ($0) = $1,010.
Last reported payment date: 2024-05-23 • Largest payer in this snapshot: Regeneron Pharmaceuticals, Inc. ($1,010).
Total Amount
$1,010
General + Research + Ownership
Payments
7
Total payment records
General Amount
$0
General payments
Research Amount
$1,010
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-23
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Regeneron Pharmaceuticals, Inc. | $1,010 |
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: 2006-10-24
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 |
|---|---|---|---|---|
| I20061024000274 | I | Medical Oncology | KS | 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 66205)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Hematology/Oncology, Internal Medicine | KS | |
| Hematology/Oncology, Internal Medicine | KS | |
| - | IL | |
| P A T H O L O G Y | PA | |
| Nurse Practitioner | KS | |
| Hematology/Oncology, Internal Medicine | KS | |
| Nurse Practitioner | KS | |
| Radiation Oncology | MO | |
| Hematology/Oncology, Internal Medicine | KS | |
| Radiation Oncology | MO |
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