Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Radiological Associates of Sacramento Medical Group

Radiation Oncology Physician in Sacramento, CA · enumerated 2005 · authorized official Jonathan Breslau, President.

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

National Provider Identifier

1922089424

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Registry record

Entity type Organization (Type 2)

Legal business name Radiological Associates of Sacramento Medical Group

Practice address 2800 L St, Suite 10, Sacramento, CA, 95816

Phone (916) 454-6600

Fax (916) 454-6618

Enumeration date Nov 10, 2005

Last updated in NPPES Oct 27, 2011

Taxonomy & classification

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Jonathan Breslau

Title President

Phone (916) 646-8300

Other identifiers

Identifier	Type	State	Issuer
GR002851K	Medicaid	CA	-

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 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.

What type of organization is Radiological Associates of Sacramento Medical Group?

Radiological Associates of Sacramento Medical Group is registered in NPPES as a Radiation Oncology Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-27.