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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

ISAIAS DE GUZMAN PAJA JR. MD INC
NPI 1053367896
Clinic/Center in Los Angeles, CA

Active since May 25, 2006CLIA 05D2345813 · Waiver
8301 S VERMONT AVE STE B, LOS ANGELES, CA 90044(323) 778-7772(213) 484-9939 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 29, 2026, Sep 9, 2026, Sep 4, 2026 and 5 more (8 updates tracked since 2024).

About Isaias De Guzman Paja Jr. Md Inc NPPES

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

ISAIAS DE GUZMAN PAJA JR. MD INC (NPI 1053367896), doing business as Paja Medical Group, is a healthcare organization registered as a clinic/center in Los Angeles, California and active in the NPI registry since May 2006. The organization holds a CLIA Waiver certificate valid through June 16, 2028, maintains 2 additional practice locations, and lists Isaias Paja, Owner/president, as its authorized official.

NPPES Registry Identity

NPI1053367896
Entity TypeOrganization
Primary Taxonomy261Q00000X
Legal Business NameISAIAS DE GUZMAN PAJA JR. MD INC
Location Address8301 S VERMONT AVE STE BLos Angeles, CA 90044-3470
Mailing Address1800 Wilshire BlvdLos Angeles, CA 90057-3602 · (213) 484-9934 · Fax (213) 484-9939
Phone(323) 778-7772
Fax(213) 484-9939
Organization SubpartNo
Authorized OfficialIsaias PajaOwner/president · (213) 484-9934
Enumeration DateMay 25, 2006
Last NPPES UpdateSeptember 29, 20268 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2026
✔ NPI 1053367896 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinic/CenterAmbulatory Health Care Facilities
Taxonomy Code261Q00000X
Definition
A facility or distinct part of one used for the diagnosis and treatment of outpatients. Clinic/Center is irregularly defined, sometimes being limited to organizations serving specialized treatment requirements or distinct patient/client groups (e.g., radiology, poor, and public health).
8301 S VERMONT AVE STE B, Los Angeles, CA 90044
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Other Names 2

Doing Business AsPaja Medical Group
Other NameIsaias De Guzman Paja Jr. Md,inc

Secondary Practice Locations 2

Location 13500 Whittier Blvd Ste 107Los Angeles, CA 90023-1746 · Phone (213) 493-3976
Location 21511 S Vermont Ave Unit 2Los Angeles, CA 90006-4505 · Phone (213) 318-5015 · Fax (213) 318-5099

Other Identifiers 2

MedicaidGR 0100110CA
Medicaid1053367896CA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Isaias De Guzman Paja Jr. Md Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Isaias De Guzman Paja Jr. MD Inc, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Isaias Paja, M.D.
Family Practice
NPI 1518997709
1800 WILSHIRE BLVD
Los Angeles, CA 90057
(213) 484-9934
✔ PECOS6.5 mi
Quang Tran, PMHNP-BC
Nurse Practitioner
NPI 1497269864
2491 PACIFIC AVE
Long Beach, CA 90806
(562) 989-1322
✔ PECOS12 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 05D2345813

Isaias De Guzman Paja Jr, MD Inc · Los Angeles, CA
Active · expires Jun 16, 2028
CLIA Number05D2345813
Laboratory TypePhysician Office
Certificate Effective DateJune 17, 2026
Certificate Expiration DateJune 16, 2028
Laboratory DirectorIsaias De Duzman Paja
Laboratory Phone(323) 778-7772
Laboratory LocationIsaias De Guzman Paja Jr, MD Inc8301 S Vermont Ave Suite B, Los Angeles, CA 90044
CLIA data matches this NPI record on: Address Name 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 Isaias De Guzman Paja Jr. MD Inc's NPI number?

The NPI number for Isaias De Guzman Paja Jr. MD Inc is 1053367896. It was assigned to this organization in the NPPES registry on May 25, 2006. The provider is doing business as Paja Medical Group. The provider is also known as Isaias De Guzman Paja Jr. Md,inc.

Where is Isaias De Guzman Paja Jr. MD Inc located?

Isaias De Guzman Paja Jr. MD Inc is located at 8301 S Vermont Ave Ste B, Los Angeles, CA 90044. The listed phone number is (323) 778-7772.

What is Isaias De Guzman Paja Jr. MD Inc's specialty?

The primary specialty registered for this NPI is Clinic/Center with taxonomy code 261Q00000X.

Is Isaias De Guzman Paja Jr. MD Inc enrolled in Medicare?

Yes. Isaias De Guzman Paja Jr. MD Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Isaias De Guzman Paja Jr. MD Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Isaias De Guzman Paja Jr. MD Inc, in Family Practice and Nurse Practitioner. 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. Of these, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Isaias De Guzman Paja Jr. MD Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D2345813) is associated with this NPI, valid through June 16, 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 Isaias De Guzman Paja Jr. MD Inc was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 27 days 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.