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ONESTOP MEDICAL CENTER
NPI 1538023510
Family Medicine in Pleasanton, CA

Active since December 12, 2025CLIA 05D2340337 · Waiver
6155 STONERIDGE DR STE 210, PLEASANTON, CA 94588(925) 263-9547(800) 507-0849 Get Directions Write a Review

NPPES record last updated: April 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 29, 2026, Feb 7, 2026, Jan 14, 2026 and 1 more (4 updates tracked since 2025).

About Onestop Medical Center NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ONESTOP MEDICAL CENTER (NPI 1538023510) is a healthcare organization registered as a family medicine in Pleasanton, California and active in the NPI registry since December 2025. The organization holds a CLIA Waiver certificate valid through March 15, 2028, maintains a secondary practice location in Pleasanton, and lists Ashish Gupta, Office Manager, as its authorized official.

NPPES Registry Identity

NPI1538023510
Entity TypeOrganization
Primary Taxonomy207Q00000X
Legal Business NameONESTOP MEDICAL CENTER
Location Address6155 STONERIDGE DR STE 210Pleasanton, CA 94588-3365
Mailing Address6155 Stoneridge Dr Ste 210Pleasanton, CA 94588-3365 · (925) 263-9547 · Fax (800) 507-0849
Phone(925) 263-9547
Fax(800) 507-0849
Organization SubpartNo
Authorized OfficialAshish GuptaOffice Manager · (925) 263-9527
Enumeration DateDecember 12, 2025
Last NPPES UpdateApril 29, 20264 updates tracked since enumeration
NPPES CertifiedApril 29, 2026
✔ NPI 1538023510 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 5

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedMarriage & Family TherapistTaxonomy 106H00000X
Also ListedInternal MedicineTaxonomy 207R00000X
Also ListedPediatricsTaxonomy 208000000X
Also ListedPreventive Medicine · Obesity MedicineTaxonomy 2083B0002X
6155 STONERIDGE DR STE 210, Pleasanton, CA 94588
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Secondary Practice Location 1

Location 15924 Stoneridge Dr Ste 110Pleasanton, CA 94588-5400 · Phone (925) 263-9547 · Fax (800) 507-0849

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Onestop Medical Center is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

5

Medicare enrollment records show 5 clinicians reassign Medicare billing to Onestop Medical Center, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 3 within 10 miles. They are listed nearest first.

Clinicians, nearest first (5)

Jee Hei Chang, RN
Nurse Practitioner
NPI 1174484620
6155 STONERIDGE DR STE 210
Pleasanton, CA 94588
(925) 263-9547
✔ PECOSSame address
Zakia Zaman, MD
Pediatric Medicine
NPI 1336350560
5924 STONERIDGE DR STE 110
Pleasanton, CA 94588
(925) 263-9547
✔ PECOS0.6 mi
Anuja Garg, MD
Internal Medicine
NPI 1841466471
5924 STONERIDGE DR STE 110
Pleasanton, CA 94588
(925) 263-9547
✔ PECOS✔ Accepts Medicare0.6 mi
Akilah Vazquez, MFT
Marriage and Family Therapist
NPI 1144619578
10901 MACARTHUR BLVD STE 201
Oakland, CA 94605
(510) 877-0614
✔ PECOS✔ Accepts Medicare14 mi
Tracy Vuong, NP
Nurse Practitioner
NPI 1841878246
2415 HIGH SCHOOL AVE STE 800
Concord, CA 94520
(909) 558-1000
✔ PECOS✔ Accepts Medicare21 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D2340337

Onestop Medical Center · Pleasanton, CA
Active · expires Mar 15, 2028
CLIA Number05D2340337
Laboratory TypeCommunity Clinic
Certificate Effective DateMarch 16, 2026
Certificate Expiration DateMarch 15, 2028
Laboratory DirectorGarg Anuja
Laboratory Phone(925) 236-9547
Laboratory LocationOnestop Medical Center6155 Stoneridge Dr, Ste 210, Pleasanton, CA 94588
CLIA data matches this NPI record on: Address Name
This certificate is issued to a laboratory to perform only waived tests.

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 Onestop Medical Center's NPI number?

The NPI number for Onestop Medical Center is 1538023510. It was assigned to this organization in the NPPES registry on December 12, 2025.

Where is Onestop Medical Center located?

Onestop Medical Center is located at 6155 Stoneridge Dr Ste 210, Pleasanton, CA 94588. The listed phone number is (925) 263-9547.

What is Onestop Medical Center's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Onestop Medical Center enrolled in Medicare?

Yes. Onestop Medical Center is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Onestop Medical Center?

According to the CMS Revalidation Reassignment List (October 2026 release), 5 clinicians reassign their Medicare billing to Onestop Medical Center, in Internal Medicine, Marriage and Family Therapist, Nurse Practitioner and Pediatric Medicine. A 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 the clinician's services. Of these, 1 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Onestop Medical Center hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D2340337) is associated with this NPI, valid through March 15, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Onestop Medical Center was last updated on April 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.