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MARY CHEN MD INC
NPI 1366591174
Internal Medicine in Walnut, CA

Active since January 10, 2007CLIA 05D1059051 · Waiver
18780 AMAR RD, SUITE 107, WALNUT, CA 91789(626) 810-6777(626) 810-6687 Get Directions Write a Review

NPPES record last updated: April 23, 2020. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Mary Chen Md Inc NPPES

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

MARY CHEN MD INC (NPI 1366591174) is a healthcare organization registered as an internal medicine in Walnut, California and active in the NPI registry since January 2007. The organization holds a CLIA Waiver certificate valid through September 19, 2026 and lists Mary Chen, President, as its authorized official.

NPPES Registry Identity

NPI1366591174
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameMARY CHEN MD INC
Location Address18780 AMAR RD, SUITE 107Walnut, CA 91789-4560
Mailing Address18780 Amar Rd, Suite 107Walnut, CA 91789-4560 · (626) 810-6777
Phone(626) 810-6777
Fax(626) 810-6687
Organization SubpartNo
Authorized OfficialMary ChenPresident · (626) 810-6777
Enumeration DateJanuary 10, 2007
Last NPPES UpdateApril 23, 2020
NPPES CertifiedApril 23, 2020
✔ NPI 1366591174 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A78207
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
18780 AMAR RD, Walnut, CA 91789
Open in Google Maps ↗

Other Identifiers 1

Medicaid00A782070CA

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

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 05D1059051

Mary Chen, MD Inc · Walnut, CA
Active · expires Sep 19, 2026
CLIA Number05D1059051
Laboratory TypePhysician Office
Certificate Effective DateSeptember 20, 2024
Certificate Expiration DateSeptember 19, 2026
Laboratory DirectorMary Chen, MD
Laboratory Phone(626) 810-6777
Laboratory LocationMary Chen, MD Inc18780 Amar Road, Suite 107, Walnut, CA 91789
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ALMA FAMILY SERVICES
Community/Behavioral Health
18780 AMAR RD, SUITE 204
WALNUT, CA 91789
Los Angeles County (626) 965-4463
DR. MARY CHEN M.D.
Internal Medicine
18780 AMAR RD, SUITE 107
WALNUT, CA 91789
Los Angeles County (626) 810-6777
ACCESS HOME HEALTH CARE, INC,.
Home Health
18780 AMAR RD, SUITE #201
WALNUT, CA 91789
Los Angeles County (626) 965-2084
MRS. AFRICA LIZETTE ARROYO B.A.
Counselor (Mental Health)
18780 AMAR RD, SUITE 204
WALNUT, CA 91789
Los Angeles County (626) 965-4463
ABLE HANDS INC.
Home Health
18780 AMAR RD, STE. 207
WALNUT, CA 91789
Los Angeles County (626) 965-2233
ERIKA ROBLES
Rehabilitation Practitioner
18780 AMAR RD, 204
WALNUT, CA 91789
Los Angeles County (626) 965-4463

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 Mary Chen MD Inc's NPI number?

The NPI number for Mary Chen MD Inc is 1366591174. It was assigned to this organization in the NPPES registry on January 10, 2007.

Where is Mary Chen MD Inc located?

Mary Chen MD Inc is located at 18780 Amar Rd Suite 107, Walnut, CA 91789. The listed phone number is (626) 810-6777.

What is Mary Chen MD Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Does Mary Chen MD Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D1059051) is associated with this NPI, valid through September 19, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Mary Chen MD Inc was last updated on April 23, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.