NPPES file of Aug 9, 2026

Gregory San Wong, MD

Geriatric Medicine (Internal Medicine) Physician · Los Angeles, CA

Gregory San Wong, MD is a geriatric medicine (internal medicine) physician with a practice address in Los Angeles, California, and NPI 1336294875, issued on Jan 24, 2007. Check the license (California A96833, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1336294875
Name
Gregory San Wong
Credential
MD
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
A96833 CA
Self-reported in NPPES; status is on the state search
Practice location
1700 Cesar Chavez Ave, Los Angeles, CA 90033
Phone
(323) 307-0800
Enumerated
Jan 24, 2007
Record last updated
Oct 1, 2009 (not updated in 17 years: call before relying on the address or phone)
Fax
(323) 307-0803
Medicaid ID
00A968330 CA
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →

Also registered at 1700 Cesar Chavez Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jose DiazAmbulatory Women's Health Care Registered Nurse1689085714
  2. Azmy Ghaly, MEDICAL DOCTORGeriatric Medicine (Internal Medicine) Physician1194899336
  3. Karla Menjivar, FNPFamily Nurse Practitioner1205155447
  4. Francisco Quijas, MEDICAL DOCTORGeriatric Medicine (Internal Medicine) Physician1659445823

Verify Gregory San Wong in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A96833    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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41% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

2,503 Medicare Part D claims for 137 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims. 39 claims were for opioids.

  1. Gregory Wong2,503
  2. Specialty average4,246

Most prescribed

  1. Atorvastatin Calcium91 claims
  2. Gabapentin91 claims
  3. Rosuvastatin Calcium61 claims
  4. Lisinopril55 claims
  5. Metformin Hcl55 claims
  6. Losartan Potassium43 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: $124.95

1 payment: food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Gregory Wong$124.95
  2. Specialty average$1,720.82

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Gregory San Wong among 532 geriatric medicine (internal medicine) physician records in California

Gregory San Wong, MD is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% 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 54% of them.

  • NPI issued2007 · 54% of these records are older, 34% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileNo · 51% of these records are
  • Record last updated2009 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Internal Medicine) Physician providers in California

There are 532 geriatric medicine (internal medicine) physician records in California.

All 532 in California → Every provider in Los Angeles → Geriatric Medicine (Internal Medicine) Physician nationwide →

The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes

  1. Andrew Chan, MDLos Angeles, CA 900331104975507
  2. Azmy Ghaly, MEDICAL DOCTORLos Angeles, CA 900331194899336
  3. Dohwa Kim, M.D.Los Angeles, CA 900331528083557
  4. Caitlyn Kuwata, M.D.Los Angeles, CA 900331093167611
  5. Francisco Quijas, MEDICAL DOCTORLos Angeles, CA 900331659445823
  6. Casey Yamashita, MDLos Angeles, CA 900331316392673
  7. Michelle Eslami, MDLos Angeles, CA 900361689627143
  8. Robert Wang, PHD MDLos Angeles, CA 900361235293648

Common questions

What is Gregory San Wong, MD's NPI number?

Gregory San Wong, MD's National Provider Identifier (NPI) is 1336294875, issued on Jan 24, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gregory San Wong, MD located?

The NPPES record lists a practice address at 1700 Cesar Chavez Ave, Los Angeles, CA, 90033. Phone: (323) 307-0800. Providers update this record themselves, so call before visiting.

How can I verify Gregory San Wong, MD's license?

NPPES lists California license number A96833, 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 Gregory San Wong, MD prescribe under Medicare Part D?

In 2024, Gregory San Wong, MD had 2,503 Medicare Part D claims for 137 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.