DR. WILLIAM S. TANNER M.D.
NPI 1457383929
Radiology - Body Imaging in Walnut Creek, CA
About Dr. William S. Tanner M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM S. TANNER M.D. (NPI 1457383929) is an individual body imaging provider in Walnut Creek, California, licensed in California (A63125) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Oakland, and is a graduate of University Of Minnesota Medical School (1995).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 3
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. William S. Tanner 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
7Medicare enrollment records show William Tanner reassigns Medicare billing to 7 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
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Sacramento, CA 95825
- Reassigned Medicare billing, California enrollment
- 220 clinicians in this Medicare group
Salinas, CA 93906
- Reassigned Medicare billing, California enrollment
- 31 clinicians in this Medicare group
Encino, CA 91436
- Reassigned Medicare billing, California enrollment
- 329 clinicians in this Medicare group
Los Angeles, CA 90025
- Reassigned Medicare billing, California enrollment
- 372 clinicians in this Medicare group
Los Angeles, CA 90025
- Reassigned Medicare billing, California enrollment
- 311 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.
Other Providers at the Same Location NPPES 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
WALNUT CREEK, CA 94598
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 William Tanner's NPI number?
The NPI number for William Tanner is 1457383929. It was assigned to this individual provider in the NPPES registry on July 7, 2006.
Where is William Tanner located?
William Tanner practices at 2125 Oak Grove Rd Ste 200, Walnut Creek, CA 94598. The listed phone number is (925) 296-7150.
What is William Tanner's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Body Imaging, with taxonomy code 2085B0100X.
Is William Tanner enrolled in Medicare?
Yes. William Tanner 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 William Tanner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Tanner reassigns Medicare benefits to 7 organizations: John Muir Trauma Physicians Billing Service (Walnut Creek, CA), Permanente Medical Group Inc (Vallejo, CA), Diagnostic Radiological Imaging (Sacramento, CA), Salinas Valley Radiologists, Inc. (Salinas, CA), San Fernando Valley Interventional Radiology And Imaging Center (Encino, CA) and 2 more organizations, 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 William Tanner'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 William Tanner was last updated on December 20, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. William S. Tanner, M.D. · NPI 1457383929
Body Imaging physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since July 7, 2006.
## Identity
- **NPI:** 1457383929 (Entity type: Individual)
- **Enumerated:** July 7, 2006
- **Primary specialty:** Radiology - Body Imaging · taxonomy 2085B0100X
- **State license:** A63125 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2125 OAK GROVE RD STE 200, Walnut Creek, CA 94598-2520
- **Phone:** (925) 296-7150
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): John Muir Trauma Physicians Billing Service (NPI 1962551861, Walnut Creek, CA); Permanente Medical Group Inc (NPI 1336222397, Vallejo, CA); Diagnostic Radiological Imaging (NPI 1710931910, Sacramento, CA); Salinas Valley Radiologists, Inc. (NPI 1386609006, Salinas, CA); San Fernando Valley Interventional Radiology And Imaging Center (NPI 1942350889, Encino, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Minnesota Medical School, class of 1995
## Record status
- **NPPES last updated:** December 20, 2021
- **Other identifiers:** Medicaid 00A631250 (CA); Other 00A631250 (CA); Other P00360941
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Source: [NPI Profile](https://npiprofile.com/npi/1457383929) · Data from the CMS NPPES public registry.