THOMAS G ZIMMERMAN M.D.
NPI 1295734127
Emergency Medicine in Grass Valley, CA
About Thomas G Zimmerman M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS G ZIMMERMAN M.D. (NPI 1295734127) is an individual emergency medicine provider in Grass Valley, California, licensed in California (G34117) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
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 (PECOS)
Thomas G Zimmerman M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Thomas Zimmerman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Grass Valley, CA 95945
- Reassigned Medicare billing, California enrollment
- 30 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95945 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.
GRASS VALLEY, CA 95945
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 Thomas Zimmerman's NPI number?
The NPI number for Thomas Zimmerman is 1295734127. It was assigned to this individual provider in the NPPES registry on July 21, 2005.
Where is Thomas Zimmerman located?
Thomas Zimmerman practices at 155 Glasson Way, Grass Valley, CA 95945. The listed phone number is (530) 274-6001.
What is Thomas Zimmerman's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Thomas Zimmerman enrolled in Medicare?
Yes. Thomas Zimmerman is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Thomas Zimmerman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Zimmerman reassigns Medicare benefits to Swope Medical Group Inc (Grass Valley, CA). The 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 Thomas Zimmerman'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 Thomas Zimmerman was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Thomas G Zimmerman, M.D. · NPI 1295734127
Emergency Medicine physician in Grass Valley, California. Individual provider, active in the CMS NPPES registry since July 21, 2005.
## Identity
- **NPI:** 1295734127 (Entity type: Individual)
- **Enumerated:** July 21, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** G34117 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 155 GLASSON WAY, Grass Valley, CA 95945-5723
- **Phone:** (530) 274-6001
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Swope Medical Group Inc (NPI 1972500593, Grass Valley, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 00G341170 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1295734127) · Data from the CMS NPPES public registry.