DR. NAZNEEN UDDIN M.D.
NPI 1023456761
Family Medicine in Walnut Creek, CA
About Dr. Nazneen Uddin M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NAZNEEN UDDIN M.D. (NPI 1023456761) is an individual family medicine provider in Walnut Creek, California, licensed in California (A133267) and active in the NPI registry since June 2013. She is enrolled in Medicare PECOS, is affiliated with Baylor Scott & White Medical Center- Waxahachie, and is a graduate of University Of Michigan Medical School (2013).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
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
Dr. Nazneen Uddin M.d. 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
6Medicare enrollment records show Nazneen Uddin reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 clinicians in this Medicare group
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 650 clinicians in this Medicare group
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 842 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
Lawton, OK 73505
- Reassigned Medicare billing, Oklahoma enrollment
- 35 clinicians in this Medicare group
Fort Worth, TX 76107
- Reassigned Medicare billing, Texas enrollment
- 3,167 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 5
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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Baylor Scott & White Medical Center- Waxahachie
Acute Care Hospitals · Waxahachie, TXBaylor Scott & White Medical Center Grapevine
Acute Care Hospitals · Grapevine, TXBaylor Scott & White Heart & Vascular Hospital - Dallas
Acute Care Hospitals · Dallas, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94595 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.
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 Nazneen Uddin's NPI number?
The NPI number for Nazneen Uddin is 1023456761. It was assigned to this individual provider in the NPPES registry on June 4, 2013.
Where is Nazneen Uddin located?
Nazneen Uddin practices at 1220 Rossmoor Pkwy, Walnut Creek, CA 94595. The listed phone number is (925) 947-3312.
What is Nazneen Uddin's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Nazneen Uddin enrolled in Medicare?
Yes. Nazneen Uddin 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 Nazneen Uddin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nazneen Uddin reassigns Medicare benefits to 6 organizations: John Muir Trauma Physicians Billing Service (Walnut Creek, CA), John Muir Physician Network (Walnut Creek, CA), University Of California Sfgh Medical Group (San Francisco, CA), County Of Santa Clara (Palo Alto, CA), Ies Hsp Oklahoma LLC (Lawton, OK) and 1 more organization, listed in the Medicare section above. 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 Nazneen Uddin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nazneen Uddin accept?
Health plans from Baylor Scott and White Health Plan and Blue Cross and Blue Shield of Texas list Nazneen Uddin as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Nazneen Uddin affiliated with any hospitals?
According to CMS data, Nazneen Uddin is affiliated with Baylor Scott & White Medical Center- Waxahachie, Baylor Scott & White Medical Center Grapevine and Baylor Scott & White Heart & Vascular Hospital - Dallas.
When was this NPI record last updated?
The NPPES record for Nazneen Uddin was last updated on October 20, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years 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.
# Dr. Nazneen Uddin, M.D. · NPI 1023456761
Family Medicine physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since June 4, 2013.
## Identity
- **NPI:** 1023456761 (Entity type: Individual)
- **Enumerated:** June 4, 2013
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A133267 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1220 ROSSMOOR PKWY, Walnut Creek, CA 94595-2501
- **Phone:** (925) 947-3312 · **Fax:** (925) 947-3396
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): John Muir Trauma Physicians Billing Service (NPI 1093864837, Walnut Creek, CA); John Muir Physician Network (NPI 1841407665, Walnut Creek, CA); University Of California Sfgh Medical Group (NPI 1174598296, San Francisco, CA); County Of Santa Clara (NPI 1285228080, Palo Alto, CA); Ies Hsp Oklahoma LLC (NPI 1518724616, Lawton, OK); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Michigan Medical School, class of 2013
## Record status
- **NPPES last updated:** October 20, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1023456761) · Data from the CMS NPPES public registry.