Mary Leong, OD
- Medicare patients, 2024
- 40
- Part D claims, 2024
- 12
- Hospital affiliations
- 1
- Industry payments
- $243
- Medical groups
- 4
- Practice address
- 3840 Balfour Rd A, Brentwood, CA 94513-1641
- Practice phone
- Call (925) 513-0323
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Lone Tree Vision Care
Eye care practice · Brentwood, California
Find Mary Leong's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Mary Leong is an optometrist in Brentwood, California
Mary Leong practices at Lone Tree Vision Care in Brentwood, California.
Mary Leong's NPI, 1003968249, was assigned on January 17, 2007. Mary Leong graduated from Southern California College of Optometry in 2002. Mary Leong holds California license 11914T.
- NPI
- 1003968249NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2567627284
- NPI enumeration date
- January 17, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 513-0323
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Mary Leong practices at Lone Tree Vision Care in Brentwood, California
Mary Leong's primary practice is Lone Tree Vision Care, at 3840 Balfour Rd A, Brentwood, CA 94513-1641. The practice phone is (925) 513-0323.
- Lone Tree Vision Care3840 Balfour Rd A, Brentwood, CA 94513-1641Phone(925) 513-0323
Source: Dmand AI Affiliation Data
Mary Leong is affiliated with 4 sites of care and 4 medical groups
Mary Leong's primary practice is Lone Tree Vision Care in Brentwood, California. Mary Leong is also affiliated with Antioch Medical Center. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Mary Leong to 3 more medical groups and 2 group practices and clinics, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Mary Leong's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mary Leong practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lone Tree Vision Care | Available with a free account |
| +3 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Mary Leong is one of 7,206 optometrists in California
Optometrist is Mary Leong's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Mary Leong is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near Mary Leong
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Mary Leong treated 40 Medicare patients in 2024, average age 76
CMS counts 40 Medicare patients who saw Mary Leong in 2024. The largest group is 65 to 74, with 16 patients. 68% of them have high blood pressure, and 63% have high cholesterol. Their average risk score is 1.04, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Mary Leong's median patient age at 72, with 65% women.
Mary Leong's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Mary Leong's Medicare patients by sex, 2024
- Women2563%
- Men1538%
Chronic conditions among Mary Leong's Medicare patients, 2024
- High blood pressure68%
- High cholesterol63%
- Arthritis43%
Share of Medicare patients with each condition. A patient can have several.
Mary Leong's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women65%
- Men33%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mary Leong wrote 12 Medicare Part D claims in 2024
In 2024, Mary Leong wrote 12 Medicare Part D claims. 100% of them were for generic drugs.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Mary Leong takes part in Medicare
Mary Leong accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Mary Leong received $243 in industry payments in 2025
CMS Open Payments shows 2 general payments to Mary Leong from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $243.
Companies that paid Mary Leong the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Mary Leong graduated from Southern California College of Optometry
Mary Leong graduated from Southern California College of Optometry in 2002.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Mary Leong's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Mary Leong
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mary Leong's NPI number?
Mary Leong's NPI number is 1003968249. It was assigned on January 17, 2007, and it is active in the NPI Registry.
What does Mary Leong specialize in?
Mary Leong is an optometrist in Brentwood, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Mary Leong practice?
Mary Leong practices at 3840 Balfour Rd A, Brentwood, CA 94513-1641. Mary Leong's primary practice is Lone Tree Vision Care in Brentwood, California. Dmand AI also links Mary Leong to 3 medical groups and 2 group practices and clinics.
What is Mary Leong's office phone number?
The practice phone on file for Mary Leong is (925) 513-0323.
What is Mary Leong's medical license number?
Mary Leong holds California license 11914T.
Which hospitals is Mary Leong affiliated with?
Mary Leong is affiliated with Antioch Medical Center.
What medical group is Mary Leong part of?
Mary Leong is linked to The Permanente Medical Group, Inc. Dmand AI links Mary Leong to 3 more medical groups.
Does Mary Leong accept Medicare?
Yes. CMS lists Mary Leong as accepting Medicare assignment.
How many Medicare patients does Mary Leong see?
CMS counts 40 Medicare patients who saw Mary Leong in 2024, with an average age of 76.
Where did Mary Leong go to medical school?
Mary Leong graduated from Southern California College of Optometry in 2002.
Has Mary Leong received payments from drug or device companies?
CMS Open Payments shows $243 in general payments to Mary Leong from 1 company from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Mary Leong been practicing?
Mary Leong graduated from medical school in 2002, 24 years ago.
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