MR. CARL WILLIAM BUCKHORN (M.D.) – Internal Medicine Physician, NPI 1649264847
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,558 INTERNAL MEDICINE in CA
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Provider Addresses for MR. CARL WILLIAM BUCKHORN (M.D.)
Yorba Linda Boulevard, Esperanza, Yorba Linda, Orange County, California, 92887, United States
STE 401
YORBA LINDA, CA 928864056
Phone: (714) 646-8000
Fax: (714) 572-2562
Type: Mailing
Caduceus Medical Group (Specialty), 18300, Yorba Linda Boulevard, Yorba Linda, Orange County, California, 92886, United States
STE 204
YORBA LINDA, CA 928864052
Phone: (714) 577-6031
Fax: (714) 572-2562
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 8 Open Payments records for all available years, with a total value of $700.
Total Amount is formed as General ($700) + Research ($0) + Ownership ($0) = $700.
Last reported payment date: 2024-10-22 • Largest payer in this snapshot: Merck Sharp & Dohme LLC ($310).
Total Amount
$700
General + Research + Ownership
Payments
8
Total payment records
General Amount
$700
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-22
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Merck Sharp & Dohme LLC | $310 |
| AstraZeneca Pharmaceuticals LP | $222 |
| Lilly USA, LLC | $125 |
| Amgen Inc. | $28 |
| ABBVIE INC. | $15 |
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: 2005-12-19
PECOS data refreshed: 2026-06-15
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 |
|---|---|---|---|---|
| I20051219001011 | I | Internal Medicine | 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.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 156 | 58 | $0 |
| 99442 | Telephone medical discussion with physician, 11-20 minutes | 51 | 19 | $0 |
Insurance plans in this area (ZIP 92886)
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