Sing H. Tan, MD
Internal Medicine Physician · Oakland, CA
Sing H. Tan, MD is an internal medicine physician with a practice address in Oakland, California, and NPI 1447212048, issued on Apr 6, 2006. Check the license (California A25140, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sing H. Tan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A25140 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2700 International Blvd, Oakland, CA 94601
- Phone
- (510) 533-9422
- Enumerated
- Apr 6, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (510) 533-2414
- Medicaid ID
- 00A251400 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2700 International Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Bruce O'Neil, M.D.Internal Medicine Physician1255399580
Verify Sing H. Tan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A25140Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
17 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Sing H. Tan among 17,696 internal medicine physician records in California
Sing H. Tan, MD 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 updated2007 · 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).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Zaina El-Isa, MDOakland, CA 946011861623555
- Claire Horton, MDOakland, CA 946011649374109
- Astha Kanani, M.D.Oakland, CA 946011770880163
- Bhrett Lash, MDOakland, CA 946011568489383
- Esteban Lovato, M.D.Oakland, CA 946011376610923
- Joseph Marquis, MDOakland, CA 946011598084329
- John Murphy, M.D.Oakland, CA 946011437119591
- Bruce O'Neil, M.D.Oakland, CA 946011255399580
Common questions
What is Sing H. Tan, MD's NPI number?
Sing H. Tan, MD's National Provider Identifier (NPI) is 1447212048, issued on Apr 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sing H. Tan, MD located?
The NPPES record lists a practice address at 2700 International Blvd, Oakland, CA, 94601. Phone: (510) 533-9422. Providers update this record themselves, so call before visiting.
How can I verify Sing H. Tan, MD's license?
NPPES lists California license number A25140, 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 Sing H. Tan, MD prescribe under Medicare Part D?
In 2024, Sing H. Tan, MD had 17 Medicare Part D claims; 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.