Nancy Jeong-Sun Han, M.D.
Gastroenterology Physician · Fountain Valley, CA
Nancy Jeong-Sun Han, M.D. is a gastroenterology physician with a practice address in Fountain Valley, California, and NPI 1609055300, issued on Oct 30, 2007. Check the license (California A99261, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nancy Jeong-Sun Han
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A99261 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18035 Brookhurst St Ste 2100, Fountain Valley, CA 92708
- Phone
- (657) 241-9090
- Enumerated
- Oct 30, 2007
- Record last updated
- Feb 3, 2023
- Fax
- (714) 665-4603
- Medicare enrollment
- Enrolled (PECOS I20110920000645); accepts Medicare assignment
- Medical or professional school
- Ohio Medical University, 2005
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 18035 Brookhurst St Ste 2100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Erick Argueta, MDGastroenterology Physician1083144638
- Sarah Bartulis, CNMAdvanced Practice Midwife1639554678
- Trisha Chaudhury, DOObstetrics & Gynecology Physician1316688815
- Lizhou Huang, M.D.Gastroenterology Physician1396088977
- Vincent Kao, DOGastroenterology Physician1649570268
- Lena Nguyen, DOObstetrics & Gynecology Physician1467741728
Verify Nancy Jeong-Sun Han in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A99261Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
About as many Medicare Part D claims as the average gastroenterology physician in 2024
809 Medicare Part D claims for 427 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Sod Sulf-Potass Sulf-Mag Sulf294 claims
- Pantoprazole Sodium161 claims
- Omeprazole70 claims
- Gavilyte-G47 claims
- Famotidine27 claims
- Mesalamine18 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: $391.59
16 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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.
Bills Medicare through one group practice
- Memorialcare Medical FoundationFountain Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nancy Jeong-Sun Han among 2,140 gastroenterology physician records in California
Nancy Jeong-Sun Han, 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 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2005 · 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 Fountain Valley → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Jose Luis Aranez, M.D.Fountain Valley, CA 927081932466125
- Erick Argueta, MDFountain Valley, CA 927081083144638
- Fernando Austin, MDFountain Valley, CA 927081174527774
- Babak Firoozi, M.D.Fountain Valley, CA 927081891734828
- Lizhou Huang, M.D.Fountain Valley, CA 927081396088977
- Vincent Kao, DOFountain Valley, CA 927081649570268
- Duke Nguyen, MDFountain Valley, CA 927081679557797
- Ronald Policastro, M.D.Fountain Valley, CA 927081962671636
Common questions
What is Nancy Jeong-Sun Han, M.D.'s NPI number?
Nancy Jeong-Sun Han, M.D.'s National Provider Identifier (NPI) is 1609055300, issued on Oct 30, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nancy Jeong-Sun Han, M.D. located?
The NPPES record lists a practice address at 18035 Brookhurst St Ste 2100, Fountain Valley, CA, 92708. Phone: (657) 241-9090. Providers update this record themselves, so call before visiting.
How can I verify Nancy Jeong-Sun Han, M.D.'s license?
NPPES lists California license number A99261, 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 Nancy Jeong-Sun Han, M.D. prescribe under Medicare Part D?
In 2024, Nancy Jeong-Sun Han, M.D. had 809 Medicare Part D claims for 427 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.