GRASS VALLEY RADIATION ONCOLOGY
NPI 1649895194
Radiology - Radiation Oncology in Grass Valley, CA
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
Specialties & Licenses
Secondary Practice Location 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Grass Valley Radiation Oncology is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
9Medicare enrollment records show 9 clinicians reassign Medicare billing to Grass Valley Radiation Oncology, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 6 within 10 miles. They are listed nearest first.
Clinicians, nearest first (9)
Grass Valley, CA 95945
Grass Valley, CA 95945
Grass Valley, CA 95945
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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.
Is Grass Valley Radiation Oncology enrolled in Medicare?
Yes. Grass Valley Radiation Oncology is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Grass Valley Radiation Oncology?
According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 4 Medicare specialties reassign their Medicare billing to Grass Valley Radiation Oncology. A 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 the clinician's services. The largest specialties are Family Practice (3), Radiation Oncology (3) and Nurse Practitioner (2). Of these, 4 practice at this address and 6 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 5 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.
# Grass Valley Radiation Oncology · NPI 1649895194
Radiation Oncology organization in Grass Valley, California. Organization record, active in the CMS NPPES registry since June 10, 2020.
## Identity
- **NPI:** 1649895194 (Entity type: Organization)
- **Enumerated:** June 10, 2020
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **Organization subpart:** No
- **Authorized official:** Clayton Hess, OWNER
## Practice location
- **Address:** 300 SIERRA COLLEGE DR STE 150, Grass Valley, CA 95945-5083
- **Phone:** (530) 802-6400
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 9 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Family Practice (3), Radiation Oncology (3), Nurse Practitioner (2); 4 practice at this address and 6 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 29, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1649895194) · Data from the CMS NPPES public registry.