Mary Leong, O.D.
NPI 1003968249 · Optometrist · Brentwood, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Leong, O.D. is a Optometrist provider in Brentwood, CA (NPI 1003968249).
Provider details
- NPI number
- 1003968249
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 11914T (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
44 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Complete Exam of Visual System92014 | 22 | $158 |
| New Patient Complete Exam of Visual System92004 | 11 | $178 |
| Imaging of Optic Nerve92133 | 11 | $42 |
Typical Medicare-allowed amounts for these services range $42–$178 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$615 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 5109 Lone Tree WayAntioch, CA 94531-8484Phone: (925) 757-5560
Registry dates
- Enumerated
- 2007-01-17
- Last updated
- 2026-05-25
- Certified
- 2026-05-25
Frequently asked questions
- What is Mary Leong's NPI number?
- Mary Leong's National Provider Identifier (NPI) is 1003968249, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Leong's specialty?
- Mary Leong is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Mary Leong located?
- Mary Leong's practice location on file with NPPES is 3840 Balfour Rd Ste a, Brentwood, CA 94513-1641.
- What is Mary Leong's phone number?
- The practice phone number listed in the NPPES registry for Mary Leong is (925) 513-0323.
- Does Mary Leong accept Medicare?
- Mary Leong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Leong's NPI active?
- Yes — Mary Leong's NPI (1003968249) is active in the NPPES registry as of the last update on 2026-05-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.