Mary Saeun Hong, M.D.
Internal Medicine Physician · San Leandro, CA
Mary Saeun Hong, M.D. is an internal medicine physician with a practice address in San Leandro, California, and NPI 1861570624, issued on Nov 1, 2006. Check the license (California A61806, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mary Saeun Hong
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A61806 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple Road, San Leandro, CA 94587
- Phone
- (510) 454-1000
- Enumerated
- Nov 1, 2006
- Record last updated
- Feb 2, 2022
- Medicaid ID
- 00A618060 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3553 Whipple Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Saeun Hong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61806Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,576 Medicare Part D claims for 620 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 180 claims were for opioids.
Most prescribed
- Atorvastatin Calcium791 claims
- Amlodipine Besylate584 claims
- Losartan Potassium354 claims
- Levothyroxine Sodium253 claims
- Lisinopril198 claims
- Metformin Hcl Er195 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: $96.35
1 payment: food and beverage; the largest payer was Dentsply Canada Ltd. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Mary Saeun Hong among 17,696 internal medicine physician records in California
Mary Saeun Hong, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2022 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 internal medicine physician records list a practice address in San Leandro
They are 62 of the 4,976 NPPES records with a practice address in San Leandro, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Leandro → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Eric Brondfield, MDUnion City, CA 945871033297882
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- Vanaja Chilukuri, M.D.Union City, CA 945871861578387
- Lolita Chiong, M.D.Union City, CA 945871558387027
- Amrita Deshpande, M.D.Union City, CA 945871154409910
- Apolinar Gacote, MDUnion City, CA 945871831203652
- Yasmeen Haq, MDUnion City, CA 945871457303935
Common questions
What is Mary Saeun Hong, M.D.'s NPI number?
Mary Saeun Hong, M.D.'s National Provider Identifier (NPI) is 1861570624, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Saeun Hong, M.D. located?
The NPPES record lists a practice address at 3553 Whipple Road, San Leandro, CA, 94587. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Mary Saeun Hong, M.D.'s license?
NPPES lists California license number A61806, 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 Mary Saeun Hong, M.D. prescribe under Medicare Part D?
In 2024, Mary Saeun Hong, M.D. had 6,576 Medicare Part D claims for 620 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.