MARY LEONG O.D.
NPI 1003968249
Optometrist in Brentwood, CA

Q: What is Mary Leong's NPI number?

The NPI number for Mary Leong is 1003968249. It was assigned to this individual provider in the NPPES registry on January 17, 2007.

Q: What is Mary Leong's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Q: When was this NPI record last updated?

The NPPES record for Mary Leong was last updated on May 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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 January 17, 2007PECOS EnrolledAccepts Medicare Assignment

3840 BALFOUR RD STE A, BRENTWOOD, CA 94513(925) 513-0323(925) 513-8649 Get Directions Write a Review

NPPES record last updated: May 25, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: May 25, 2026, Jan 3, 2022 (2 updates tracked since 2022).

On this page

About Mary Leong O.d. NPPES

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

MARY LEONG O.D. (NPI 1003968249) is an individual optometrist in Brentwood, California, licensed in California (11914T) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in Antioch, and is a graduate of Southern California College Of Optometry (2002).

NPPES Registry Identity

NPI1003968249

Entity TypeIndividualFemale

Primary Taxonomy152W00000X

Provider Legal NameMARY LEONGCredential: O.D.

Location Address3840 BALFOUR RD STE ABrentwood, CA 94513-1641

Mailing Address3840 Balfour Rd Ste ABrentwood, CA 94513-1641

Phone(925) 513-0323

Fax(925) 513-8649

Sole ProprietorNo

Medical School CMSSouthern California College Of OptometryGraduated 2002

Enumeration DateJanuary 17, 2007

Last NPPES UpdateMay 25, 20262 updates tracked since enumeration

NPPES CertifiedMay 25, 2026

✔ NPI 1003968249 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers

Taxonomy Code152W00000X

License✔ Licensed in CA · 11914T

Definition

Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

3840 BALFOUR RD STE A, Brentwood, CA 94513

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Secondary Practice Location 1

Location 15109 Lone Tree WayAntioch, CA 94531-8484 · Phone (925) 757-5560

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mary Leong O.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2567627284

PECOS Enrollment IDI20120703000237

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.

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient complete exam of visual system 92014

An established patient complete exam of the visual system involves a thorough check of your eyes and vision. It assesses eye health, checks for diseases, and measures your ability to see clearly at different distances. It's a routine, non-invasive procedure.

22 services22 patients

New patient complete exam of visual system 92004

A new patient complete exam of the visual system is a thorough evaluation of your eyes and vision. It checks for any potential issues and assesses overall eye health. It includes tests for visual acuity, eye movement, and light response.

11 services11 patients

Imaging of optic nerve 92133

Imaging of the optic nerve is a non-invasive procedure that captures detailed pictures of your optic nerve. It helps doctors assess eye health, particularly for conditions like glaucoma. It's painless, quick, and uses safe technology like MRI or OCT (Optical Coherence Tomography).

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94513 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

$153.83 typical visit price

range $69.00 – $202.35

Typical copayment $38.45 (range $17.25 – $50.58)

Most-billed visit code 99204

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

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

BALFOUR VISION OPTIX OPTOMETRY, INC.

Optometrist

3840 BALFOUR RD STE A
BRENTWOOD, CA 94513

Contra Costa County (925) 513-0323

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 Mary Leong's NPI number?

The NPI number for Mary Leong is 1003968249. It was assigned to this individual provider in the NPPES registry on January 17, 2007.

Where is Mary Leong located?

Mary Leong practices at 3840 Balfour Rd Ste A, Brentwood, CA 94513. The listed phone number is (925) 513-0323.

What is Mary Leong's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is Mary Leong enrolled in Medicare?

Yes. Mary Leong is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Mary Leong accept?

Health plans from Providence Health Plan list Mary Leong as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mary Leong was last updated on May 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.