Ellen Mcdonald, M.D., Inc.
NPI 1639304843 · Internal Medicine Physician · Pasadena, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ellen Mcdonald, M.D., Inc. is a Internal Medicine Physician organization in Pasadena, CA (NPI 1639304843).
Provider details
- NPI number
- 1639304843
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Ellen Mcdonald, President(626) 872-4195
- License
- A102543 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-05-18
- Last updated
- 2010-12-02
Frequently asked questions
- What is Ellen Mcdonald, M.D., Inc.'s NPI number?
- Ellen Mcdonald, M.D., Inc.'s National Provider Identifier (NPI) is 1639304843, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Ellen Mcdonald, M.D., Inc.?
- Ellen Mcdonald, M.D., Inc. is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ellen Mcdonald, M.D., Inc. located?
- Ellen Mcdonald, M.D., Inc.'s practice location on file with NPPES is 800 Fairmount Ave, Pasadena, CA 91105-3150.
- What is Ellen Mcdonald, M.D., Inc.'s phone number?
- The practice phone number listed in the NPPES registry for Ellen Mcdonald, M.D., Inc. is (626) 872-4195.
- Does Ellen Mcdonald, M.D., Inc. accept Medicare?
- Ellen Mcdonald, M.D., Inc. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Ellen Mcdonald, M.D., Inc.?
- The authorized official listed on Ellen Mcdonald, M.D., Inc.'s NPPES record is Ellen Mcdonald, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Ellen Mcdonald, M.D., Inc.'s NPI active?
- Yes — Ellen Mcdonald, M.D., Inc.'s NPI (1639304843) is active in the NPPES registry as of the last update on 2010-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.