Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Riverside Radiology Medical Group Inc

Diagnostic Radiology Physician in Riverside, CA · enumerated 2005 · authorized official Donal Massee, President.

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

National Provider Identifier

1699776526

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Registry record

Entity type Organization (Type 2)

Legal business name Riverside Radiology Medical Group Inc

Practice address 4445 Magnolia Ave, Riverside, CA, 92501

Phone (951) 788-3400

Fax (951) 788-3194

Enumeration date Aug 2, 2005

Last updated in NPPES Jul 21, 2022

Taxonomy & classification

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Donal Massee

Title President

Phone (951) 781-2270

Other identifiers

Identifier	Type	State	Issuer
GR0104280	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 Riverside Radiology Medical Group Inc?

Riverside Radiology Medical Group Inc is registered in NPPES as a Diagnostic Radiology Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.