WILLIAM JHONGHOON YOON (M.D.) – Vascular Surgery Physician, NPI 1720368657
Vascular Surgery Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
674 VASCULAR SURGERY in CA
Provider Addresses for WILLIAM JHONGHOON YOON (M.D.)
2221 STOCKTON BLVD., CYPRESS BLDG.
3RD FLOOR
SACRAMENTO, CA 958171418
Phone:
Type: Mailing
4860 Y STREET
SUITE 2100
SACRAMENTO, CA 958171418
Phone: (708) 327-3041
Fax: (708) 327-3489
Type: Location
9650 GROSS POINT RD STE 4900
SKOKIE, IL 600765080
Phone: (847) 663-8050
Fax: (224) 251-4407
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 60 Open Payments records for all available years, with a total value of $7,268.
Total Amount is formed as General ($7,268) + Research ($0) + Ownership ($0) = $7,268.
Last reported payment date: 2024-12-03 • Largest payer in this snapshot: Cook Medical LLC ($1,907).
Total Amount
$7,268
General + Research + Ownership
Payments
60
Total payment records
General Amount
$7,268
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-03
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Cook Medical LLC | $1,907 |
| W. L. Gore & Associates, Inc. | $1,796 |
| Cook Incorporated | $1,507 |
| Bolton Medical Inc | $715 |
| Medtronic, Inc. | $563 |
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: 2026-01-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 5 Medicare enrollment records; no due dates published yet.
Enrollment records
5
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 |
|---|---|---|---|---|
| I20180918000167 | I | Vascular Surgery | CA | TBD |
| I20210421001612 | I | Vascular Surgery | IL | TBD |
| I20221007002191 | I | Vascular Surgery | OH | TBD |
| I20260114001105 | I | Vascular Surgery | MD | TBD |
| I20260114001537 | I | Vascular Surgery | DC | 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 |
|---|---|---|---|---|
| 93880 | Ultrasound of both sides of head and neck blood flow | 99 | 99 | $0 |
| 93970 | Ultrasound study of arm or leg veins with compression and maneuvers | 48 | 46 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 38 | 29 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 37 | 37 | $0 |
| 93922 | Ultrasound study of arm and leg arteries | 35 | 35 | $0 |
Insurance plans in this area (ZIP 95817)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | MD | |
| - | MD | |
| - | MD | |
| - | MD | |
| Internal Medicine | MD | |
| Critical Care (Intensivists), Sleep Medicine, Pulmonary Disease | MD | |
| - | MD | |
| Diagnostic Radiology, Interventional Radiology | PA | |
| Geriatric Medicine, Internal Medicine | MD | |
| Orthopedic Surgery | MD |
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