WILLIAM LEWIS MCKAY (DO) – Family Medicine Physician, NPI 1265417331
Family Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,330 FAMILY PRACTICE in MO
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Provider Addresses for WILLIAM LEWIS MCKAY (DO)
108, South Hickory Street, Mount Vernon, Lawrence County, Missouri, 65712, United States
MOUNT VERNON, MO 657121407
Phone: (417) 466-4110
Fax: (417) 466-4255
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 56 Open Payments records for all available years, with a total value of $959.
Total Amount is formed as General ($959) + Research ($0) + Ownership ($0) = $959.
Last reported payment date: 2024-08-07 • Largest payer in this snapshot: Lilly USA, LLC ($255).
Total Amount
$959
General + Research + Ownership
Payments
56
Total payment records
General Amount
$959
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-07
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2008-12-05
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 |
|---|---|---|---|---|
| I20081205000103 | I | Family Practice | 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 65712)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | MO | |
| Family Practice | MO | |
| Nurse Practitioner | MO | |
| Clinical Psychologist | MO | |
| Nurse Practitioner | AR | |
| - | OK | |
| Clinical Social Worker | MO | |
| Family Practice, Internal Medicine | MO | |
| Nurse Practitioner | AR | |
| - | MO |
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