Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

THOMAS G ZIMMERMAN M.D.
NPI 1295734127
Emergency Medicine in Grass Valley, CA

Q: 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.

Q: What is Thomas Zimmerman's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Q: When was this NPI record last updated?

The NPPES record for Thomas Zimmerman was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since July 21, 2005PECOS Enrolled

155 GLASSON WAY, GRASS VALLEY, CA 95945(530) 274-6001 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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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

NPI1295734127

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameTHOMAS G ZIMMERMANCredential: M.D.

Location Address155 GLASSON WAYGrass Valley, CA 95945-5723

Mailing Address103 Providence Mine Rd, Suite 202Nevada City, CA 95959-2941 · (530) 470-8377 · Fax (530) 470-8906

Phone(530) 274-6001

Sole ProprietorNo

Enumeration DateJuly 21, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1295734127 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in CA · G34117

Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

155 GLASSON WAY, Grass Valley, CA 95945

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Other Identifiers 1

Medicaid00G341170CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Thomas G Zimmerman M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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.

New Patient

$90.32 typical visit price

range $58.87 – $176.60

Typical copayment $22.58 (range $14.71 – $44.15)

Most-billed visit code 99203

Established Patient

$103.36 typical visit price

range $19.28 – $144.60

Typical copayment $25.84 (range $4.82 – $36.15)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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