NPPES file of Aug 9, 2026

Michelle Y. Ong, M.D.

Internal Medicine Physician · Orinda, CA

Michelle Y. Ong, M.D. is an internal medicine physician with a practice address in Orinda, California, and NPI 1871671594, issued on Nov 1, 2006. Check the license (California A67566, 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
1871671594
Name
Michelle Y. Ong
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
A67566 CA
Self-reported in NPPES; status is on the state search
Practice location
140 Brookwood RD, Orinda, CA 94563
Phone
(925) 254-9090
Enumerated
Nov 1, 2006
Record last updated
Mar 10, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(925) 254-4399
Medicaid ID
00A675660 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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Also registered at 140 Brookwood RD

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

  1. Maria Andrae-Hammond, M.D.Internal Medicine Physician1942579115
  2. Michelle Bricker, M.D.Internal Medicine Physician1952353963
  3. Sandra Goldstein, M.D.Internal Medicine Physician1467496984
  4. Michele Herman, M.D.Internal Medicine Physician1588600753
  5. Anita Krishnamurthy, M.D.Internal Medicine Physician1811973092
  6. Vyjayanti Ramaswamy, M.D.Internal Medicine Physician1730110784

Verify Michelle Y. Ong in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A67566    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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87% fewer Medicare Part D claims than the average internal medicine physician in 2024

407 Medicare Part D claims for 35 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Michelle Ong407
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium45 claims
  2. Amlodipine Besylate39 claims
  3. Losartan Potassium23 claims
  4. Simvastatin21 claims
  5. Mirtazapine16 claims
  6. Pantoprazole Sodium13 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.

21 internal medicine physician records list a practice address in Orinda

They are 21 of the 278 NPPES records with a practice address in Orinda, and 17,696 internal medicine physician records in California.

All 21 in Orinda → All 17,696 in California → Every provider in Orinda →

Other internal medicine physician records in California

  1. Jacob Aaron, MDSan Francisco, CA1407202518
  2. Alistair Aaronson, MDStanford, CA1457628760
  3. Jose Abad., MDSacramento, CA1144607219
  4. Donna Abare, MDOakland, CA1386722155
  5. Marce AbareScotts Valley, CA1457744708
  6. Samuel Abarte, M.D.Chula Vista, CA1578535498
  7. Alexander Abary, MDLong Beach, CA1104995919
  8. Luba Abascal, MDSan Francisco, CA1023180874
  9. Michael Abate, MDSacramento, CA1548248131
  10. Wali Abawi, D.O.Joshua Tree, CA1104362268

Common questions

What is Michelle Y. Ong, M.D.'s NPI number?

Michelle Y. Ong, M.D.'s National Provider Identifier (NPI) is 1871671594, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Michelle Y. Ong, M.D. located?

The NPPES record lists a practice address at 140 Brookwood RD, Orinda, CA, 94563. Phone: (925) 254-9090. Providers update this record themselves, so call before visiting.

How can I verify Michelle Y. Ong, M.D.'s license?

NPPES lists California license number A67566, 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 Michelle Y. Ong, M.D. prescribe under Medicare Part D?

In 2024, Michelle Y. Ong, M.D. had 407 Medicare Part D claims for 35 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.

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.