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GRASS VALLEY RADIATION ONCOLOGY
NPI 1649895194
Radiology - Radiation Oncology in Grass Valley, CA

Active since June 10, 2020
300 SIERRA COLLEGE DR STE 150, GRASS VALLEY, CA 95945(530) 802-6400 Get Directions Write a Review

NPPES record last updated: April 29, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Apr 29, 2026, Feb 7, 2024, Jun 10, 2020 (3 updates tracked since 2020).

About Grass Valley Radiation Oncology NPPES

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

GRASS VALLEY RADIATION ONCOLOGY (NPI 1649895194) is a healthcare organization registered as a radiation oncology in Grass Valley, California and active in the NPI registry since June 2020. The organization maintains a secondary practice location in Grass Valley and lists Clayton B Hess, Owner, as its authorized official.

NPPES Registry Identity

NPI1649895194
Entity TypeOrganization
Primary Taxonomy2085R0001X
Legal Business NameGRASS VALLEY RADIATION ONCOLOGY
Location Address300 SIERRA COLLEGE DR STE 150Grass Valley, CA 95945-5083
Mailing Address300 Sierra College Dr Ste 150Grass Valley, CA 95945-5083 · (530) 802-6400 · Fax (530) 267-6733
Phone(530) 802-6400
Organization SubpartNo
Authorized OfficialClayton B HessOwner · (678) 733-5626
Enumeration DateJune 10, 2020
Last NPPES UpdateApril 29, 20263 updates tracked since enumeration
NPPES CertifiedApril 29, 2026
✔ NPI 1649895194 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0001X
Definition
A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.
300 SIERRA COLLEGE DR STE 150, Grass Valley, CA 95945
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Secondary Practice Location 1

Location 1155 Glasson Way Bldg 3L-20Grass Valley, CA 95945-5723 · Phone (407) 788-1906 ext. 225 · Fax (407) 682-4844

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MEHWISH K KHAN MD
Internal Medicine
300 SIERRA COLLEGE DR STE 150
GRASS VALLEY, CA 95945
Nevada County (530) 274-6600
CONSTANCE E GAULTER M.D.
Family Medicine
300 SIERRA COLLEGE DR STE 150
GRASS VALLEY, CA 95945
Nevada County (530) 802-6400
MS. MARIYA ALDER NP
Nurse Practitioner
300 SIERRA COLLEGE DR STE 150
GRASS VALLEY, CA 95945
Nevada County (530) 274-6600
ELISE MORGAN NP
Nurse Practitioner
300 SIERRA COLLEGE DR STE 150
GRASS VALLEY, CA 95945
Nevada County (530) 274-6600

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 Grass Valley Radiation Oncology's NPI number?

The NPI number for Grass Valley Radiation Oncology is 1649895194. It was assigned to this organization in the NPPES registry on June 10, 2020.

Where is Grass Valley Radiation Oncology located?

Grass Valley Radiation Oncology is located at 300 Sierra College Dr Ste 150, Grass Valley, CA 95945. The listed phone number is (530) 802-6400.

What is Grass Valley Radiation Oncology's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

When was this NPI record last updated?

The NPPES record for Grass Valley Radiation Oncology 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 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.