Elaine K. Ong, M.D.
Pediatrics Physician · Hayward, CA
Elaine K. Ong, M.D. is a pediatrics physician with a practice address in Hayward, California, and NPI 1053499806, issued on Nov 1, 2006. Check the license (California A64839, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Elaine K. Ong
- Credential
- M.D.
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- A64839 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27303 Sleepy Hollow Ave S, Hayward, CA 94545
- Phone
- (510) 454-1000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A648390 CA
- Entity
- Type 1 · individual
Also registered at 27303 Sleepy Hollow Ave S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Malini Amin, MDPediatrics Physician1801095252
- Madhulika Battu, MDPediatrics Physician1245736370
- Mario Bernaba, MDNephrology Physician1205499506
- Neelam Bhalla, M.D.Nephrology Physician1639118052
- Pooja Bhoopalam, PHARMDPharmacist1871022186
- Natalie CacAllergy & Immunology Physician1205006657
Verify Elaine K. Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46 pediatrics physician records list a practice address in Hayward
They are 46 of the 3,993 NPPES records with a practice address in Hayward, and 9,272 pediatrics physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 46 in Hayward → All 9,272 in California → Every provider in Hayward →
Other pediatrics physician records in California
- Subha Aahlad, M.D.Foster City, CA1780610253
- Rebecca Aaronson, MDPanorama City, CA1487746814
- Gregorio Abad-Santos, M.D.Long Beach, CA1255451894
- Michelle Abajian, MDLa Canada, CA1619176757
- Joseph Abapo, MDRiverside, CA1841348786
- Zvart Abaryan, MDLos Angeles, CA1154940849
- Lauren Abbas, MDLos Angeles, CA1982163796
- Attia Abbasi, M.D.Auburn, CA1922027127
- Denise AbbasiParadise, CA1770062341
- Alexandra Abbott, MDPalo Alto, CA1760018675
Common questions
What is Elaine K. Ong, M.D.'s NPI number?
Elaine K. Ong, M.D.'s National Provider Identifier (NPI) is 1053499806, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Elaine K. Ong, M.D. located?
The NPPES record lists a practice address at 27303 Sleepy Hollow Ave S, Hayward, CA, 94545. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Elaine K. Ong, M.D.'s license?
NPPES lists California license number A64839, 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.