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Tustin Irvine Medical Group, PC

Urgent Care Clinic/Center in Valencia, CA · enumerated 2008 · authorized official Joseph Mallas, Assistant Secretary.

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

National Provider Identifier

1053576876

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Registry record

Entity type Organization (Type 2)
Legal business name Tustin Irvine Medical Group, PC
Parent organization U.S. Healthworks Medical Group, PC
Practice address 25124 Springfield Ct, Suite 200, Valencia, CA, 91355
Phone (661) 678-2600
Fax (661) 678-2700
Enumeration date Jul 21, 2008
Last updated in NPPES Feb 9, 2015

Taxonomy & classification

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians Secondary
261QU0200X Urgent Care Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Joseph Mallas
Title Assistant Secretary
Phone (661) 678-2626

Other identifiers

Identifier Type State Issuer
CU798A Other - MEDICARE GROUP PTAN

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.

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Frequently asked questions

What is the NPI number for Tustin Irvine Medical Group, PC?
The NPI for Tustin Irvine Medical Group, PC is 1053576876, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Tustin Irvine Medical Group, PC?
NPPES lists Joseph Mallas (Assistant Secretary) as the authorized official for this organization.

Providers at this address

Browse all →
U.S. Healthworks Medical Group of Arizona, Inc. Urgent Care Clinic/Center · Valencia, CA NPI 1023098845 U.S. Healthworks Medical Group of Alaska, LLC Preventive Medicine/Occupational Environmental Medicine Physician · Valencia, CA NPI 1841270337 Beverly Lassiter-Brown Medical Physician Assistant · Valencia, CA NPI 1962670141 U.S. Healthworks Medical Group of Illinois, PC Preventive Medicine/Occupational Environmental Medicine Physician · Valencia, CA NPI 1467797316 U.S. Healthworks Medical Group of Kansas City, P.A Preventive Medicine/Occupational Environmental Medicine Physician · Valencia, CA NPI 1093152241 U.S. Healthworks Medical Group of Kentucky, Inc. Urgent Care Clinic/Center · Valencia, CA NPI 1619361961 U.S. Healthworks Provider Network of Colorado, Inc. Preventive Medicine/Occupational Environmental Medicine Physician · Valencia, CA NPI 1073970174

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-02-09.