Mary Leong, OD - Medicare Optometrist in Brentwood, CA

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Mary Leong, OD is a medicare enrolled "Optometrist" provider in Brentwood, California. She went to Southern California College Of Optometry and graduated in 2002 and has 24 years of diverse experience with area of expertise as Optometry. She is a member of the group practice Balfour Vision Optix Optometry Inc, Winson Ong Od and her current practice location is 3840 Balfour Rd Ste A, Brentwood, California. You can reach out to her office (for appointments etc.) via phone at (925) 513-0323.

Mary Leong is licensed to practice in California (license number 11914T) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1003968249.

Contact Information

Mary Leong, OD
3840 Balfour Rd Ste A,
Brentwood, CA 94513-1641
(925) 513-0323
(925) 513-8649

Map and Direction




Healthcare Provider's Profile

Full NameMary Leong
GenderFemale
SpecialityOptometry
Experience24 Years
Location3840 Balfour Rd Ste A, Brentwood, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Mary Leong attended and graduated from Southern California College Of Optometry in 2002
  NPI Data:
  • NPI Number: 1003968249
  • Provider Enumeration Date: 01/17/2007
  • Last Update Date: 05/25/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 2567627284
  • Enrollment ID: I20120703000237

Medical Identifiers

Medical identifiers for Mary Leong such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1003968249NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
152W00000XOptometrist 11914T (California)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Balfour Vision Optix Optometry Inc33757072763
Winson Ong Od88204219933

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Mary Leong allows following entities to bill medicare on her behalf.
Provider NamePermanente Medical Group Inc
Provider TypePart B Supplier - Clinic/group Practice
Provider IdentifiersNPI Number: 1073606299
PECOS PAC ID: 8921910225
Enrollment ID: O20031104000710
Provider NameBalfour Vision Optix Optometry Inc.
Provider TypePart B Supplier - Clinic/group Practice
Provider IdentifiersNPI Number: 1760670624
PECOS PAC ID: 3375707276
Enrollment ID: O20120605000400
Provider NameWinson Ong Od
Provider TypePart B Supplier - Clinic/group Practice
Provider IdentifiersNPI Number: 1770130932
PECOS PAC ID: 8820421993
Enrollment ID: O20191203001958
Provider NameDiamond Valley Optometry
Provider TypePart B Supplier - Clinic/group Practice
Provider IdentifiersNPI Number: 1285473611
PECOS PAC ID: 4587198775
Enrollment ID: O20241111002555

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Mary Leong is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Mary Leong, OD
3840 Balfour Rd Ste A,
Brentwood, CA 94513-1641

Ph: () -		Mary Leong, OD
3840 Balfour Rd Ste A,
Brentwood, CA 94513-1641

Ph: (925) 513-0323

Reviews and Comments


Optometrist in Brentwood, CA

Dr. Ashley Darnell-sakata, Od, Optometric Corporation
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Phone: 925-634-0303    Fax: 925-634-0338
Ingrid A. Stevens-farinas, O.d. Inc.
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Phone: 925-240-8520    Fax: 925-240-8546
Delta Vista Optometry Inc.
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Practice Location: 8440 Brentwood Blvd Ste F, Brentwood, CA 94513
Phone: 924-634-0303    Fax: 925-634-0338
Carol A Buchanan, OD
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Medicare: Medicare Enrolled
Practice Location: 8440 Brentwood Blvd Ste F, Brentwood, CA 94513
Phone: 925-634-0303    Fax: 925-634-0338
Dr. Poonam Kaur Bains, O.D.
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Medicare: Not Enrolled in Medicare
Practice Location: 2565 Sand Creek Rd Ste 124, Brentwood, CA 94513
Phone: 925-240-8961    
Ashley Darnell-sakata, O.D.
Optometrist
Medicare: Accepting Medicare Assignments
Practice Location: 8440 Brentwood Blvd Ste F, Brentwood, CA 94513
Phone: 925-634-0303    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.