Won-Seok Jo, M.D.
NPI 1245215144 · Gastroenterology Physician · San Bernardino, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Won-Seok Jo, M.D. is a Gastroenterology Physician provider in San Bernardino, CA (NPI 1245215144).
Provider details
- NPI number
- 1245215144
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A91260 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
622 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 113 | $123 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 104 | $250 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 88 | $171 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 68 | $132 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 58 | $179 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 507 | 470 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 295 | 273 |
| Omeprazole | 287 | 87 |
| Famotidine | 274 | 83 |
| Linaclotidebrand: Linzess | 108 | 27 |
| Sucralfate | 84 | 36 |
| Pantoprazole Sodium | 72 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,225 across 65 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-13
- Last updated
- 2023-10-17
- Certified
- 2023-08-28
Frequently asked questions
- What is Won-Seok Jo's NPI number?
- Won-Seok Jo's National Provider Identifier (NPI) is 1245215144, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Won-Seok Jo's specialty?
- Won-Seok Jo is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Won-Seok Jo located?
- Won-Seok Jo's practice location on file with NPPES is 424 E Vanderbilt Way Ste B, San Bernardino, CA 92408-3552.
- What is Won-Seok Jo's phone number?
- The practice phone number listed in the NPPES registry for Won-Seok Jo is (909) 796-0363.
- Does Won-Seok Jo accept Medicare?
- Won-Seok Jo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Won-Seok Jo's NPI active?
- Yes — Won-Seok Jo's NPI (1245215144) is active in the NPPES registry as of the last update on 2023-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.