Baotram Nguyen, M.D.
Obstetrics & Gynecology Physician · Castro Valley, CA
Baotram Nguyen, M.D. is an obstetrics & gynecology physician with a practice address in Castro Valley, California, and NPI 1255607727, issued on Mar 28, 2012. Check the license (California A120787, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Baotram Nguyen
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A120787 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20101 Lake Chabot RD FL 4, Castro Valley, CA 94546
- Phone
- (510) 886-3400
- Enumerated
- Mar 28, 2012
- Record last updated
- Mar 14, 2025
- Medicare enrollment
- Enrolled (PECOS I20140714002163); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 20101 Lake Chabot RD FL 4
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susana Harbutt, M.D.Endocrinology, Diabetes & Metabolism Physician1588007678
- Radhika Madhavan, MDObstetrics & Gynecology Physician1457513053
- Samuel Santoro, DOObstetrics & Gynecology Physician1013023795
- Anna Maria Sapugay, MDObstetrics & Gynecology Physician1972514966
- Julie Siegel, LCSWClinical Social Worker1730944240
Verify Baotram Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A120787Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
47 Medicare Part D claims for 24 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol12 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
- Sutter Bay Medical FoundationCastro Valley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Baotram Nguyen among 5,088 obstetrics & gynecology physician records in California
Baotram Nguyen, M.D. 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 2012, is newer than 75% of them.
- NPI issued2012 · 75% of these records are older, 22% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2010 · median 2004 among the 2,700 with a school on file
- Record last updated2025 · 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).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Castro Valley → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Ana BermudezCastro Valley, CA 945461679079065
- Kalaokalani Chandler, M.D.Castro Valley, CA 945461164459947
- Murray Gould, M.D.Castro Valley, CA 945461619985025
- Garima Loharuka, D.O.Castro Valley, CA 945461972897478
- Radhika Madhavan, MDCastro Valley, CA 945461457513053
- Michael McGlynn, MDCastro Valley, CA 945461730255332
- Samuel Santoro, DOCastro Valley, CA 945461013023795
- Anna Maria Sapugay, MDCastro Valley, CA 945461972514966
Common questions
What is Baotram Nguyen, M.D.'s NPI number?
Baotram Nguyen, M.D.'s National Provider Identifier (NPI) is 1255607727, issued on Mar 28, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Baotram Nguyen, M.D. located?
The NPPES record lists a practice address at 20101 Lake Chabot RD FL 4, Castro Valley, CA, 94546. Phone: (510) 886-3400. Providers update this record themselves, so call before visiting.
How can I verify Baotram Nguyen, M.D.'s license?
NPPES lists California license number A120787, 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 Baotram Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Baotram Nguyen, M.D. had 47 Medicare Part D claims for 24 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.