NAM X NGUYEN (MD) – Obstetrics & Gynecology Physician, NPI 1033158704
Obstetrics & Gynecology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,034 OBSTETRICS/GYNECOLOGY in CA
Provider Addresses for NAM X NGUYEN (MD)
4053 Lone Tree Way Ste 100
Antioch, CA 945316210
Phone: (925) 756-3400
Fax: (510) 506-7728
Type: Location
350 John Muir Pkwy
Brentwood, CA 945135183
Phone: (925) 513-2483
Fax: (510) 506-7727
Type: Location
325, Distel Circle, Los Altos, Santa Clara County, California, 94022, United States
LOS ALTOS, CA 940221408
Phone: (925) 875-6546
Type: Mailing
4000, Dublin Boulevard, Dublin, Alameda County, California, 9458811, United States
DUBLIN, CA 94568
Phone: (925) 875-6546
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-03-11
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20080311000292 | I | Obstetrics/Gynecology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 22 | 19 | $0 |
Insurance plans in this area (ZIP 94531)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| A L L E R G Y/ I M M U N O L O G Y | CA | |
| - | CA | |
| Obstetrics/Gynecology, Hospitalist | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | OR | |
| - | CA | |
| - | CA | |
| - | CA | |
| - | CA | |
| A N E S T H E S I O L O G Y | CA | |
| G A S T R O E N T E R O L O G Y | CA |
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