James Diffley, M.D.
NPI 1780974626 · Pediatrics Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Diffley, M.D. is a Pediatrics Physician provider in Oakland, CA (NPI 1780974626).
Provider details
- NPI number
- 1780974626
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A114288 (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
15 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
- 2011-04-12
- Last updated
- 2022-02-11
Frequently asked questions
- What is James Diffley's NPI number?
- James Diffley's National Provider Identifier (NPI) is 1780974626, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Diffley's specialty?
- James Diffley is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is James Diffley located?
- James Diffley's practice location on file with NPPES is 747 52nd St, Oakland, CA 94609-1809.
- What is James Diffley's phone number?
- The practice phone number listed in the NPPES registry for James Diffley is (510) 842-3938.
- Does James Diffley accept Medicare?
- James Diffley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Diffley's NPI active?
- Yes — James Diffley's NPI (1780974626) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.