CALIFORNIA KIDNEY SPECIALISTS
NPI 1760497457
Internal Medicine - Nephrology in San Dimas, CA
About California Kidney Specialists NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CALIFORNIA KIDNEY SPECIALISTS (NPI 1760497457) is a healthcare organization registered as a nephrology in San Dimas, California and active in the NPI registry since July 2006. The organization holds a CLIA Waiver certificate valid through August 3, 2028 and lists Roya Tahmassebi, Office Manager, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
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)
California Kidney Specialists is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
20Medicare enrollment records show 20 clinicians reassign Medicare billing to California Kidney Specialists, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 12 within 10 miles. They are listed nearest first.
Clinicians by Medicare Specialty 5
Clinicians, nearest first (20)
San Dimas, CA 91773
San Dimas, CA 91773
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 05D1057202
California Kidney Specialists · San Dimas, CAFrequently 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 California Kidney Specialists's NPI number?
The NPI number for California Kidney Specialists is 1760497457. It was assigned to this organization in the NPPES registry on July 30, 2006.
Where is California Kidney Specialists located?
California Kidney Specialists is located at 1335 W Cypress Ave, San Dimas, CA 91773. The listed phone number is (909) 542-2770.
What is California Kidney Specialists's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is California Kidney Specialists enrolled in Medicare?
Yes. California Kidney Specialists is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through California Kidney Specialists?
According to the CMS Revalidation Reassignment List (October 2026 release), 20 clinicians in 5 Medicare specialties reassign their Medicare billing to California Kidney Specialists. 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 Nephrology (12), Internal Medicine (5) and Family Practice (1). Of these, 4 practice at this address and 12 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does California Kidney Specialists hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D1057202) is associated with this NPI, valid through August 3, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for California Kidney Specialists was last updated on March 16, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# California Kidney Specialists · NPI 1760497457
Nephrology organization in San Dimas, California. Organization record, active in the CMS NPPES registry since July 30, 2006.
## Identity
- **NPI:** 1760497457 (Entity type: Organization)
- **Enumerated:** July 30, 2006
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **Organization subpart:** No
- **Authorized official:** Roya Tahmassebi, OFFICE MANAGER
## Practice location
- **Address:** 1335 W CYPRESS AVE, San Dimas, CA 91773-3537
- **Phone:** (909) 542-2770 · **Fax:** (909) 394-1800
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 20 clinicians in 5 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nephrology (12), Internal Medicine (5), Family Practice (1); 4 practice at this address and 12 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 16, 2012
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1760497457) · Data from the CMS NPPES public registry.