NAM X NGUYEN MD
NPI 1033158704
Obstetrics & Gynecology in Dublin, CA
About Nam X Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NAM X NGUYEN MD (NPI 1033158704) is an individual obstetrics & gynecology provider in Dublin, California, licensed in California (A98320) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Virginia Commonwealth University, School Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Nam X Nguyen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Nam Nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orinda, CA 94563
- Reassigned Medicare billing, California enrollment
- 4,479 clinicians in this Medicare group
Merced, CA 95340
- Reassigned Medicare billing, California enrollment
- 126 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 2
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94568 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DUBLIN, CA 94568
DUBLIN, CA 94568
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Nam Nguyen's NPI number?
The NPI number for Nam Nguyen is 1033158704. It was assigned to this individual provider in the NPPES registry on June 6, 2006.
Where is Nam Nguyen located?
Nam Nguyen practices at 4000 Dublin Blvd, Dublin, CA 94568. The listed phone number is (925) 875-6546.
What is Nam Nguyen's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Nam Nguyen enrolled in Medicare?
Yes. Nam Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Nam Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nam Nguyen reassigns Medicare benefits to 2 organizations: Sutter Bay Medical Foundation (Orinda, CA) and Merced Hospitalist Medical Group, Inc. (Merced, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Nam Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Nam Nguyen was last updated on January 2, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Nam X Nguyen, MD · NPI 1033158704
Obstetrics & Gynecology physician in Dublin, California. Individual provider, active in the CMS NPPES registry since June 6, 2006.
## Identity
- **NPI:** 1033158704 (Entity type: Individual)
- **Enumerated:** June 6, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** A98320 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 4000 DUBLIN BLVD, Dublin, CA 94568
- **Phone:** (925) 875-6546
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Sutter Bay Medical Foundation (NPI 1366898538, Orinda, CA); Merced Hospitalist Medical Group, Inc. (NPI 1730431875, Merced, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Virginia Commonwealth University, School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** January 2, 2025
- **Other identifiers:** Other A98320 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1033158704) · Data from the CMS NPPES public registry.