NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

California Kidney Specialists

Nephrology Physician in San Dimas, CA · enumerated 2006 · authorized official Roya Tahmassebi, Office Manager.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1760497457

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name California Kidney Specialists
Practice address 1335 W Cypress Ave, San Dimas, CA, 91773
Phone (909) 542-2770
Fax (909) 394-1800
Enumeration date Jul 30, 2006
Last updated in NPPES Mar 16, 2012

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Secondary
207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Roya Tahmassebi
Title Office Manager
Phone (909) 542-2770

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What type of organization is California Kidney Specialists?
California Kidney Specialists is registered in NPPES as a Nephrology Physician (its primary provider taxonomy).
What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-03-16.