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ELLEN MCDONALD, M.D., INC.
NPI 1639304843
Internal Medicine in Pasadena, CA

Active since May 18, 2009
800 FAIRMOUNT AVE, SUITE 210, PASADENA, CA 91105(626) 872-4195(626) 628-1836 Get Directions Write a Review

NPPES record last updated: December 2, 2010. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Ellen Mcdonald, M.d., Inc. NPPES

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

ELLEN MCDONALD, M.D., INC. (NPI 1639304843) is a healthcare organization registered as an internal medicine in Pasadena, California and active in the NPI registry since May 2009. The organization lists Ellen Kathleen Mcdonald, President, as its authorized official.

NPPES Registry Identity

NPI1639304843
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameELLEN MCDONALD, M.D., INC.
Location Address800 FAIRMOUNT AVE, SUITE 210Pasadena, CA 91105-3150
Mailing Address800 Fairmount Ave, Suite 210Pasadena, CA 91105-3150 · (626) 872-4195 · Fax (626) 628-1836
Phone(626) 872-4195
Fax(626) 628-1836
Organization SubpartNo
Authorized OfficialEllen Kathleen McdonaldPresident · (626) 872-4195
Enumeration DateMay 18, 2009
Last NPPES UpdateDecember 2, 2010
✔ NPI 1639304843 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 · A102543
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.
800 FAIRMOUNT AVE, Pasadena, CA 91105
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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 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)

Ellen Mcdonald, M.d., Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Ellen Mcdonald, M.D., Inc., which bills Medicare for the services this clinician delivers.

Clinician (1)

Ellen Mcdonald, M.D.
Internal Medicine
NPI 1679751408
800 FAIRMOUNT AVE SUITE 210
Pasadena, CA 91105
(626) 872-4195
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Ellen Mcdonald, M.D., Inc.'s NPI number?

The NPI number for Ellen Mcdonald, M.D., Inc. is 1639304843. It was assigned to this organization in the NPPES registry on May 18, 2009.

Where is Ellen Mcdonald, M.D., Inc. located?

Ellen Mcdonald, M.D., Inc. is located at 800 Fairmount Ave Suite 210, Pasadena, CA 91105. The listed phone number is (626) 872-4195.

What is Ellen Mcdonald, M.D., Inc.'s specialty?

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

Is Ellen Mcdonald, M.D., Inc. enrolled in Medicare?

Yes. Ellen Mcdonald, M.D., Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Ellen Mcdonald, M.D., Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Ellen Mcdonald, M.D., Inc.. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Ellen Mcdonald, M.D., Inc. was last updated on December 2, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.