John Terence Tan So, MD
Internal Medicine Physician · Downey, CA
John Terence Tan So, MD is an internal medicine physician with a practice address in Downey, California, and NPI 1801924295, issued on Feb 28, 2007. Check the license (California A98802, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Terence Tan So
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A98802 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10441 Lakewood Blvd Ste AB, Downey, CA 90241
- Phone
- (562) 869-1070
- Enumerated
- Feb 28, 2007
- Record last updated
- Nov 29, 2025
- Fax
- (562) 286-8777
- Medicare enrollment
- Enrolled (PECOS I20070927000959); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 10441 Lakewood Blvd Ste AB
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Terence Tan So in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A98802Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
496 Medicare Part D claims for 152 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Pantoprazole Sodium43 claims
- Levofloxacin33 claims
- Atorvastatin Calcium28 claims
- Prednisone26 claims
- Metoprolol Tartrate21 claims
- Amlodipine Besylate16 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.
Bills Medicare through one group practice
- Healthcare Partners Affiliates Medical GroupLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Terence Tan So among 17,696 internal medicine physician records in California
John Terence Tan So, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1999 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
114 internal medicine physician records list a practice address in Downey
They are 114 of the 3,607 NPPES records with a practice address in Downey, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Downey → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nazar Al-Bussam, MDDowney, CA 902411003999145
- Domingo Barrientos, M.D.Downey, CA 902411184685281
- Arthur Carrasco, M.D.Downey, CA 902411588601595
- Shahryar Davari, MDDowney, CA 902411346244373
- Henry Do, M.D.Downey, CA 902411538115290
- Alan Frischer, M.D.Downey, CA 902411982701454
- Narayana Gunda, M.D.Downey, CA 902411720026271
- Vinod Patel, M.D.Downey, CA 902411043226756
Common questions
What is John Terence Tan So, MD's NPI number?
John Terence Tan So, MD's National Provider Identifier (NPI) is 1801924295, issued on Feb 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Terence Tan So, MD located?
The NPPES record lists a practice address at 10441 Lakewood Blvd Ste AB, Downey, CA, 90241. Phone: (562) 869-1070. Providers update this record themselves, so call before visiting.
How can I verify John Terence Tan So, MD's license?
NPPES lists California license number A98802, 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 John Terence Tan So, MD prescribe under Medicare Part D?
In 2024, John Terence Tan So, MD had 496 Medicare Part D claims for 152 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.