DR. WILLIAM B. AHNN (M.D.) – Anesthesiology Physician, NPI 1457338683
Anesthesiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
6,371 ANESTHESIOLOGY in CA
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Provider Addresses for DR. WILLIAM B. AHNN (M.D.)
North Tustin Avenue, Santa Ana, Orange County, California, 92705, United States
SANTA ANA, CA 927053807
Phone: (800) 883-7243
Fax: (714) 647-1245
Type: Mailing
Saint Bernardine Medical Center, 2101, North Waterman Avenue, San Bernardino, San Bernardino County, California, 92404, United States
SAN BERNARDINO, CA 924044836
Phone: (909) 883-3711
Type: Location
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 $58.
Total Amount is formed as General ($58) + Research ($0) + Ownership ($0) = $58.
Last reported payment date: 2024-08-09 • Largest payer in this snapshot: Ethicon US, LLC ($58).
Total Amount
$58
General + Research + Ownership
Payments
2
Total payment records
General Amount
$58
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-09
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Ethicon US, LLC | $58 |
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: 2004-10-04
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 |
|---|---|---|---|---|
| I20041004001190 | I | Anesthesiology | CA | 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 92705)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CA | |
| A N E S T H E S I O L O G Y | CA | |
| - | CA | |
| A N E S T H E S I O L O G Y | MA | |
| Certified Registered Nurse Anesthetist (Crna) | CA | |
| A N E S T H E S I O L O G Y | CA | |
| - | CA | |
| A N E S T H E S I O L O G Y | CA | |
| A N E S T H E S I O L O G Y | CA | |
| A N E S T H E S I O L O G Y | CA |
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