Tom T. Nguyen, M.D.
Hospitalist Physician · Walnut Creek, CA
Tom T. Nguyen, M.D. is a hospitalist physician with a practice address in Walnut Creek, California, and NPI 1144269382, issued on Jun 5, 2006. Check the license (California A87794, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tom T. Nguyen
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A87794 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1220 Rossmoor Pkwy, Walnut Creek, CA 94595
- Phone
- (925) 947-3393
- Enumerated
- Jun 5, 2006
- Record last updated
- Jun 21, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (925) 947-3396
- Medicaid ID
- 00A877940 CA
- Medicare enrollment
- Enrolled (PECOS I20050115000166); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 1220 Rossmoor Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Anusha Bakshi, M.D.Internal Medicine Physician1346778909
- Christian Balzer, M.D.Internal Medicine Physician1518104892
Verify Tom T. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A87794Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average hospitalist physician in 2024
202 Medicare Part D claims for 95 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Furosemide13 claims
- Prednisone12 claims
- Cefdinir11 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
- King County Public Hospital District NO 2Kirkland, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tom T. Nguyen among 3,099 hospitalist physician records in California
Tom T. Nguyen, M.D. is one of 3,099 hospitalist physician records with a practice address in California. 90% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated1997 · median 2010 among the 2,505 with a school on file
- Record last updated2012 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
68 hospitalist physician records list a practice address in Walnut Creek
They are 68 of the 6,170 NPPES records with a practice address in Walnut Creek, and 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Walnut Creek → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Mitchell Applegate, M.D.Walnut Creek, CA 945951093803447
- Ansoo Batsha, M.D.Walnut Creek, CA 945951851594089
- Susan Bell, MDWalnut Creek, CA 945951952489783
- Preet Bhambra, D.O.Walnut Creek, CA 945951598919839
- Rami Fasheh, M.D.Walnut Creek, CA 945951265577001
- Robert Feren, M.D.Walnut Creek, CA 945951851453104
- Neetu Gakhar, M.D.Walnut Creek, CA 945951093993099
- Betsy Jacobs, M.D.Walnut Creek, CA 945951124041066
Common questions
What is Tom T. Nguyen, M.D.'s NPI number?
Tom T. Nguyen, M.D.'s National Provider Identifier (NPI) is 1144269382, issued on Jun 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tom T. Nguyen, M.D. located?
The NPPES record lists a practice address at 1220 Rossmoor Pkwy, Walnut Creek, CA, 94595. Phone: (925) 947-3393. Providers update this record themselves, so call before visiting.
How can I verify Tom T. Nguyen, M.D.'s license?
NPPES lists California license number A87794, 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 Tom T. Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Tom T. Nguyen, M.D. had 202 Medicare Part D claims for 95 beneficiaries; the average among hospitalist physician prescribers was 521. 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.