Diem P. Truong, MD
Obstetrics & Gynecology Physician · Milpitas, CA
Diem P. Truong, MD is an obstetrics & gynecology physician with a practice address in Milpitas, California, and NPI 1356428296, issued on Oct 31, 2006. Check the license (California G81474, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diem P. Truong
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G81474 CA
Self-reported in NPPES; status is on the state search - Practice location
- 770 E Calaveras Blvd, Milpitas, CA 95035
- Phone
- (650) 945-2900
- Enumerated
- Oct 31, 2006
- Record last updated
- Dec 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G814740 CA
- Medicare enrollment
- Enrolled (PECOS I20110214000976); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 1993
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 770 E Calaveras Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diem P. Truong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G81474Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
160 Medicare Part D claims for 85 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Estradiol46 claims
- Hydrocortisone23 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
- Permanente Medical Group IncSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diem P. Truong among 5,088 obstetrics & gynecology physician records in California
Diem P. Truong, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% 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, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1993 · median 2004 among the 2,700 with a school on file
- Record last updated2021 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 obstetrics & gynecology physician records list a practice address in Milpitas
They are 9 of the 878 NPPES records with a practice address in Milpitas, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Milpitas → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Katherine Brubaker, MDMilpitas, CA 950351376620211
- Melanie De Guzman, MDMilpitas, CA 950351306918057
- Danna Doering, MDMilpitas, CA 950351336226265
- Chanan Duong, MDMilpitas, CA 950351003379702
- Rita Freimuth, M.D.Milpitas, CA 950351700951423
- I-Ching Gong, MDMilpitas, CA 950351831276765
- Hanh Hoang, M.D.Milpitas, CA 950351093941973
- Janelle Ogura, MDMilpitas, CA 950351083786883
Common questions
What is Diem P. Truong, MD's NPI number?
Diem P. Truong, MD's National Provider Identifier (NPI) is 1356428296, issued on Oct 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diem P. Truong, MD located?
The NPPES record lists a practice address at 770 E Calaveras Blvd, Milpitas, CA, 95035. Phone: (650) 945-2900. Providers update this record themselves, so call before visiting.
How can I verify Diem P. Truong, MD's license?
NPPES lists California license number G81474, 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 Diem P. Truong, MD prescribe under Medicare Part D?
In 2024, Diem P. Truong, MD had 160 Medicare Part D claims for 85 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.