DR. WON-SEOK JO (M.D.) – Gastroenterology Physician, NPI 1245215144
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,981 GASTROENTEROLOGY in CA
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Provider Addresses for DR. WON-SEOK JO (M.D.)
Redlands, Ullswater Industrial Estate, London Borough of Croydon, London, Greater London, England, CR5 2UH, United Kingdom
REDLANDS, CA 923744548
Phone: (909) 796-0363
Type: Mailing
424 E VANDERBILT WAY STE B
SAN BERNARDINO, CA 924083552
Phone: (909) 796-0363
Fax: (909) 255-7292
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 143 Open Payments records for all available years, with a total value of $2,477.
Total Amount is formed as General ($2,477) + Research ($0) + Ownership ($0) = $2,477.
Last reported payment date: 2024-12-18 • Largest payer in this snapshot: Gilead Sciences, Inc. ($513).
Total Amount
$2,477
General + Research + Ownership
Payments
143
Total payment records
General Amount
$2,477
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-18
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: 2005-07-05
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 |
|---|---|---|---|---|
| I20050705000356 | I | Gastroenterology | 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 |
|---|---|---|---|---|
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 78 | 75 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 65 | 63 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 55 | 55 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 47 | 37 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 46 | 46 | $0 |
Insurance plans in this area (ZIP 92374)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | CA | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 18 | 17 |
| GASTROENTEROLOGY | CA | 45378 | Diagnostic examination of large bowel using an endoscope | 52 | 50 |
| GASTROENTEROLOGY | CA | 45385 | Removal of polyps or growths of large bowel using an endoscope | 102 | 101 |
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