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MAGUIRE & WELSH MEDICAL GROUP
NPI 1164467973
Family Medicine - Geriatric Medicine in Whittier, CA

Active since June 17, 2006CLIA 05D0940537 · Waiver
7624 PAINTER AVE, #100, WHITTIER, CA 90602(562) 945-9333(562) 945-8533 Get Directions Write a Review

NPPES record last updated: February 6, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Maguire & Welsh Medical Group NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MAGUIRE & WELSH MEDICAL GROUP (NPI 1164467973) is a healthcare organization registered as a geriatric medicine in Whittier, California and active in the NPI registry since June 2006. The organization holds a CLIA Waiver certificate valid through February 10, 2028 and lists Michael J Maguire, Physician/owner, as its authorized official.

NPPES Registry Identity

NPI1164467973
Entity TypeOrganization
Primary Taxonomy207QG0300X
Legal Business NameMAGUIRE & WELSH MEDICAL GROUP
Location Address7624 PAINTER AVE, #100Whittier, CA 90602-2357
Mailing Address7624 Painter Ave, #100Whittier, CA 90602-2357 · (562) 945-9333 · Fax (562) 945-8533
Phone(562) 945-9333
Fax(562) 945-8533
Organization SubpartNo
Authorized OfficialMichael J MaguirePhysician/owner · (562) 945-9333
Enumeration DateJune 17, 2006
Last NPPES UpdateFebruary 6, 2023
NPPES CertifiedFebruary 6, 2023
✔ NPI 1164467973 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QG0300X
Licenses✔ Licensed in CA · 20A4248✔ Licensed in CA · 20A4272
Definition
A family medicine physician with special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes, and the hospital.
Also ListedFamily MedicineTaxonomy 207Q00000X · License 20A7501 (CA)
7624 PAINTER AVE, Whittier, CA 90602
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Maguire & Welsh Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

6

Medicare enrollment records show 6 clinicians reassign Medicare billing to Maguire & Welsh Medical Group, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 5 within 10 miles. They are listed nearest first.

Clinicians, nearest first (6)

Sean Welsh, M.D.
Preventive Medicine
NPI 1619232493
7624 PAINTER AVE STE 100
Whittier, CA 90602
(562) 945-9333
✔ PECOS✔ Accepts MedicareSame address
William Welsh, D.O.
Family Practice
NPI 1568401255
7624 PAINTER AVE #100
Whittier, CA 90602
(562) 945-9333
✔ PECOS✔ Accepts MedicareSame address
Esther Wang, FNP-C
Nurse Practitioner
NPI 1700523990
7624 PAINTER AVE
Whittier, CA 90602
(562) 945-9333
✔ PECOS✔ Accepts MedicareSame address
Michael Maguire, D.O.
Family Practice
NPI 1881633063
7624 PAINTER AVE #100
Whittier, CA 90602
(562) 945-9333
✔ PECOS✔ Accepts MedicareSame address
Catherine Buddemeyer, ANP
Nurse Practitioner
NPI 1225692338
12898 TOWNE CENTER DR
Cerritos, CA 90703
(866) 646-3553
✔ PECOS7.5 mi
Whitney Finch
Nurse Practitioner
NPI 1144728718
5966 W CURTISIAN AVE
Boise, ID 83704
(208) 302-5450
✔ PECOS✔ Accepts Medicare672 mi

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 05D0940537

Maguire And Welsh Medical Group · Whittier, CA
Active · expires Feb 10, 2028
CLIA Number05D0940537
Laboratory TypePhysician Office
Certificate Effective DateFebruary 11, 2026
Certificate Expiration DateFebruary 10, 2028
Laboratory DirectorMichael J. Maguire
Laboratory Phone(562) 945-9333
Laboratory LocationMaguire And Welsh Medical Group7624 Painter Avenue #100, Whittier, CA 90602
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

Frequently 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 Maguire & Welsh Medical Group's NPI number?

The NPI number for Maguire & Welsh Medical Group is 1164467973. It was assigned to this organization in the NPPES registry on June 17, 2006.

Where is Maguire & Welsh Medical Group located?

Maguire & Welsh Medical Group is located at 7624 Painter Ave #100, Whittier, CA 90602. The listed phone number is (562) 945-9333.

What is Maguire & Welsh Medical Group's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Geriatric Medicine, with taxonomy code 207QG0300X.

Is Maguire & Welsh Medical Group enrolled in Medicare?

Yes. Maguire & Welsh Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Maguire & Welsh Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 6 clinicians in 3 Medicare specialties reassign their Medicare billing to Maguire & Welsh Medical Group. 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 Nurse Practitioner (3), Family Practice (2) and Preventive Medicine (1). Of these, 4 practice at this address and 5 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Maguire & Welsh Medical Group hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0940537) is associated with this NPI, valid through February 10, 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 Maguire & Welsh Medical Group was last updated on February 6, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.