Won-Seok Jo, M.D.
Gastroenterology Physician · San Bernardino, CA
Won-Seok Jo, M.D. is a gastroenterology physician with a practice address in San Bernardino, California, and NPI 1245215144, issued on Dec 13, 2005. Check the license (California A91260, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Won-Seok Jo
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A91260 CA
Self-reported in NPPES; status is on the state search - Practice location
- 424 E Vanderbilt Way Ste B, San Bernardino, CA 92408
- Phone
- (909) 796-0363
- Enumerated
- Dec 13, 2005
- Record last updated
- Oct 17, 2023
- Fax
- (909) 255-7292
- Medicare enrollment
- Enrolled (PECOS I20050705000356); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Won-Seok Jo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A91260Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average gastroenterology physician in 2024
2,399 Medicare Part D claims for 1,073 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Gavilyte-G507 claims
- Peg-3350 And Electrolytes295 claims
- Omeprazole287 claims
- Famotidine274 claims
- Linzess108 claims
- Sucralfate84 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,225.06
65 payments; by number, the most common kind was food and beverage; the largest payer was Gilead Sciences, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Won-Seok Jo among 2,140 gastroenterology physician records in California
Won-Seok Jo, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1999 · median 2002 among the 1,538 with a school on file
- Record last updated2023 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in San Bernardino → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Gabriella Aitcheson, MDSan Bernardino, CA 924081295230415
- John Evans, MDSan Bernardino, CA 924041245253582
- Arnab Biswas, D.O.Victorville, CA 923951134216930
- Nikhil Gupta, M.D.Victorville, CA 923951982058152
- Richard Huang, MDVictorville, CA 923951124247861
- Henry Lin, M.D.Victorville, CA 923951649483033
- Thomas Thong Nguyen, M.D.,Victorville, CA 923951215126800
- Kumaravelu Balasubramaniam, MDRialto, CA 923771134184708
Common questions
What is Won-Seok Jo, M.D.'s NPI number?
Won-Seok Jo, M.D.'s National Provider Identifier (NPI) is 1245215144, issued on Dec 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Won-Seok Jo, M.D. located?
The NPPES record lists a practice address at 424 E Vanderbilt Way Ste B, San Bernardino, CA, 92408. Phone: (909) 796-0363. Providers update this record themselves, so call before visiting.
How can I verify Won-Seok Jo, M.D.'s license?
NPPES lists California license number A91260, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Won-Seok Jo, M.D. prescribe under Medicare Part D?
In 2024, Won-Seok Jo, M.D. had 2,399 Medicare Part D claims for 1,073 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.