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John Nackley, M.D.
NPI 1528003399 · Pediatrics Physician · Castro Valley, CA
John Nackley, M.D. is a Pediatrics Physician provider in Castro Valley, CA (NPI 1528003399).
Provider details
- NPI number
- 1528003399
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- C33919 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
20126 Stanton Ave
Ste 201
Castro Valley, CA 94546-5271
Phone: (510) 581-2559
Fax: (510) 581-5396
Street-level locationGet directions
Mailing address
27212 Calaroga Ave
Hayward, CA 94545-4339
Registry dates
- Enumerated
- 2006-06-17
- Last updated
- 2008-04-28
Frequently asked questions
- What is John Nackley's NPI number?
- John Nackley's National Provider Identifier (NPI) is 1528003399, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Nackley's specialty?
- John Nackley is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is John Nackley located?
- John Nackley's practice location on file with NPPES is 20126 Stanton Ave, Castro Valley, CA 94546-5271.
- What is John Nackley's phone number?
- The practice phone number listed in the NPPES registry for John Nackley is (510) 581-2559.
- Is John Nackley's NPI active?
- Yes — John Nackley's NPI (1528003399) is active in the NPPES registry as of the last update on 2008-04-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.