John E. Nackley, M.D.
Pediatrics Physician · Castro Valley, CA
John E. Nackley, M.D. is a pediatrics physician with a practice address in Castro Valley, California, and NPI 1528003399, issued on Jun 17, 2006. Check the license (California C33919, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John E. Nackley
- Credential
- M.D.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- C33919 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20126 Stanton Ave, Castro Valley, CA 94546
- Phone
- (510) 581-2559
- Enumerated
- Jun 17, 2006
- Record last updated
- Apr 28, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (510) 581-5396
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 20126 Stanton Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kenneth Smith, PHDAudiologist1467437541
Verify John E. Nackley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C33919Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John E. Nackley among 9,272 pediatrics physician records in California
John E. Nackley, M.D. is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 56% newer
- In a Medicare fileNo · 31% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2008 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 pediatrics physician records list a practice address in Castro Valley
They are 15 of the 999 NPPES records with a practice address in Castro Valley, and 9,272 pediatrics physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 9,272 in California → Every provider in Castro Valley → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Phassarin Chansakul, MDCastro Valley, CA 945461922413038
- Ken Ducker, M.D.Castro Valley, CA 945461922101963
- Kelly Gaughen, D.O.Castro Valley, CA 945461184988008
- Kimberly JohnsonCastro Valley, CA 945461437610573
- Benedikt Kurz, M.D.Castro Valley, CA 945461720037633
- Faruqa Ladha, M.D.Castro Valley, CA 945461124480157
- Yunji LeeCastro Valley, CA 945461861631442
- Pamela LinCastro Valley, CA 945461790281244
Common questions
What is John E. Nackley, M.D.'s NPI number?
John E. Nackley, M.D.'s National Provider Identifier (NPI) is 1528003399, issued on Jun 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John E. Nackley, M.D. located?
The NPPES record lists a practice address at 20126 Stanton Ave, Castro Valley, CA, 94546. Phone: (510) 581-2559. Providers update this record themselves, so call before visiting.
How can I verify John E. Nackley, M.D.'s license?
NPPES lists California license number C33919, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.