WILLIAM G. ONG MD
NPI 1508944604
Pediatrics in Livermore, CA

Q: What is William Ong's NPI number?

The NPI number for William Ong is 1508944604. It was assigned to this individual provider in the NPPES registry on November 2, 2006.

Q: What is William Ong's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Q: When was this NPI record last updated?

The NPPES record for William Ong was last updated on December 13, 2021. NPI Profile syncs with the weekly NPPES data releases published by CMS.

Active since November 02, 2006PECOS Enrolled

3000 LAS POSITAS RD, LIVERMORE, CA 94551(925) 243-2600 Get Directions Write a Review

NPPES record last updated: December 13, 2021. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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About William G. Ong Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM G. ONG MD (NPI 1508944604) is an individual pediatrics provider in Livermore, California, licensed in California (A82738) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1508944604

Entity TypeIndividualMale

Primary Taxonomy208000000X

Provider Legal NameWILLIAM G. ONGCredential: MD

Location Address3000 LAS POSITAS RDLivermore, CA 94551-9627

Mailing Address1800 Harrison St Fl 7Oakland, CA 94612-3466 · (510) 625-6262

Phone(925) 243-2600

Sole ProprietorNo

Enumeration DateNovember 2, 2006

Last NPPES UpdateDecember 13, 2021

✔ NPI 1508944604 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians

Taxonomy Code208000000X

License✔ Licensed in CA · A82738

Definition

A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

3000 LAS POSITAS RD, Livermore, CA 94551

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Other Identifiers 1

Medicaid00A827380CA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Humana.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William G. Ong Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94551 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$104.51 typical visit price

range $69.00 – $202.35

Typical copayment $26.12 (range $17.25 – $50.58)

Most-billed visit code 99203

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOSE PINAL

Counselor (Mental Health)