Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOSEPH G LEONG MD
NPI 1114555349
Surgery in Pleasanton, CA

Q: What is Joseph Leong's NPI number?

The NPI number for Joseph Leong is 1114555349. It was assigned to this individual provider in the NPPES registry on April 1, 2020.

Q: What is Joseph Leong's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Q: When was this NPI record last updated?

The NPPES record for Joseph Leong was last updated on October 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 01, 2020PECOS Enrolled

5565 W LAS POSITAS BLVD STE 260, PLEASANTON, CA 94588(925) 534-0500 Get Directions Write a Review

NPPES record last updated: October 6, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 6, 2026, Apr 1, 2020 (2 updates tracked since 2020).

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About Joseph G Leong Md NPPES

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

JOSEPH G LEONG MD (NPI 1114555349) is an individual surgery provider in Pleasanton, California, licensed in California (A203814) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1114555349

Entity TypeIndividualMale

Primary Taxonomy208600000X

Provider Legal NameJOSEPH G LEONGCredential: MD

Location Address5565 W LAS POSITAS BLVD STE 260Pleasanton, CA 94588-5807

Mailing Address5565 W Las Positas Blvd Ste 260Pleasanton, CA 94588-5807 · (925) 534-0500

Phone(925) 534-0500

Sole ProprietorNo

Enumeration DateApril 1, 2020

Last NPPES UpdateOctober 6, 20262 updates tracked since enumeration

NPPES CertifiedOctober 6, 2026

✔ NPI 1114555349 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians

Taxonomy Code208600000X

License✔ Licensed in CA · A203814

Definition

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

5565 W LAS POSITAS BLVD STE 260, Pleasanton, CA 94588

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Secondary Practice Location 1

Location 11500 S Fairfield AveChicago, IL 60608-1782 · Phone (408) 612-7694

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Joseph G Leong 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.

Medicare Billing Reassignments

Medicare enrollment records show Joseph Leong reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Stanford Health Care

0.5 mi

Radiation Oncology

5725 W LAS POSITAS BLVD, SUITE 100B
Pleasanton, CA 94588

Reassigned Medicare billing, California enrollment
4,258 clinicians in this Medicare group

NPI 1124561758 (650) 723-4000

University Healthcare Alliance

15 mi

Internal Medicine

7999 GATEWAY BLVD STE 200
Newark, CA 94560

Reassigned Medicare billing, California enrollment
435 clinicians in this Medicare group

NPI 1760531198 (888) 924-1036

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94588 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

$84.91 typical visit price

range $23.44 – $166.46

Typical copayment $21.22 (range $5.86 – $41.61)

Most-billed visit code 99213

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

Other Providers at the Same Location NPPES 4

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

CALVIN K LEI MD

Internal Medicine

5565 W LAS POSITAS BLVD STE 260
PLEASANTON, CA 94588

Alameda County (925) 416-5470

MARY ELIZABETH ESTAKHRI MD

Surgery

5565 W LAS POSITAS BLVD STE 260
PLEASANTON, CA 94588

Alameda County (925) 534-0500

SAMUEL KWONG-MING LIU MD

Surgery

5565 W LAS POSITAS BLVD STE 260
PLEASANTON, CA 94588

Alameda County (925) 416-5470

KEVIN MICHAEL IZQUIERDO MD

Surgery

5565 W LAS POSITAS BLVD STE 260
PLEASANTON, CA 94588

Alameda County (925) 416-5470

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Joseph Leong's NPI number?

The NPI number for Joseph Leong is 1114555349. It was assigned to this individual provider in the NPPES registry on April 1, 2020.

Where is Joseph Leong located?

Joseph Leong practices at 5565 W Las Positas Blvd Ste 260, Pleasanton, CA 94588. The listed phone number is (925) 534-0500.

What is Joseph Leong's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Joseph Leong enrolled in Medicare?

Yes. Joseph Leong is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Joseph Leong's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Leong reassigns Medicare benefits to 2 organizations: Stanford Health Care (Pleasanton, CA) and University Healthcare Alliance (Newark, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Joseph Leong's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Joseph Leong was last updated on October 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.