Donald Simpson, M.D., PH.D.
NPI 1699053397 · Specialist · Northridge, CA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Donald Simpson, M.D., PH.D. is a Specialist provider in Northridge, CA (NPI 1699053397).
Provider details
- NPI number
- 1699053397
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G44436 (CA)
Specialties & taxonomies
Other Service Providers
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 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
- 2011-07-28
- Last updated
- 2011-07-28
Frequently asked questions
- What is Donald Simpson's NPI number?
- Donald Simpson's National Provider Identifier (NPI) is 1699053397, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Donald Simpson's specialty?
- Donald Simpson is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Donald Simpson located?
- Donald Simpson's practice location on file with NPPES is 17425 Parthenia St, Northridge, CA 91325-3240.
- What is Donald Simpson's phone number?
- The practice phone number listed in the NPPES registry for Donald Simpson is (818) 298-1442.
- Does Donald Simpson accept Medicare?
- Donald Simpson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Donald Simpson's NPI active?
- Yes — Donald Simpson's NPI (1699053397) is active in the NPPES registry as of the last update on 2011-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.