Vivian To, DO - Medicare Family Practice in Downey, CA

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Vivian To, DO is a medicare enrolled "Hospitalist" physician in Downey, California. She went to West Virginia School Of Osteopathic Medicine and graduated in 2021 and has 4 years of diverse experience with area of expertise as Family Practice. She is a member of the group practice Apollomed Hospitalists A Medical Corporation, Pih Health Physicians and her current practice location is 11500 Brookshire Ave, Downey, California. You can reach out to her office (for appointments etc.) via phone at (562) 904-5000.

Vivian To is licensed to practice in California (license number 20A21692) 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 1043899230.

Contact Information

Vivian To, DO
11500 Brookshire Ave,
Downey, CA 90241-4917
(562) 904-5000
Not Available

Map and Direction




Physician's Profile

Full NameVivian To
GenderFemale
SpecialityFamily Practice
Experience4 Years
Location11500 Brookshire Ave, Downey, 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:
  • Vivian To attended and graduated from West Virginia School Of Osteopathic Medicine in 2021
  NPI Data:
  • NPI Number: 1043899230
  • Provider Enumeration Date: 04/05/2021
  • Last Update Date: 10/29/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 3779945407
  • Enrollment ID: I20230814000196

Medical Identifiers

Medical identifiers for Vivian To such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1043899230NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208M00000XHospitalist 20A21692 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Garfield Medical CenterMonterey park, CAHospital
San Gabriel Valley Medical CenterSan gabriel, CAHospital
Pih Hospital - DowneyDowney, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Apollomed Hospitalists A Medical Corporation599185770830
Pih Health Physicians8426951328509

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. Vivian To allows following entities to bill medicare on her behalf.
Entity NameHealthcare Partners Affiliates Medical Group
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659312593
PECOS PAC ID: 7315842002
Enrollment ID: O20031204001258
Entity NamePih Health Physicians
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1609233899
PECOS PAC ID: 8426951328
Enrollment ID: O20040128001177
Entity NameApollomed Hospitalists A Medical Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1265658595
PECOS PAC ID: 5991857708
Enrollment ID: O20090708000616

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. Vivian To 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
Vivian To, DO
11500 Brookshire Ave,
Downey, CA 90241-4917

Ph: () -		Vivian To, DO
11500 Brookshire Ave,
Downey, CA 90241-4917

Ph: (562) 904-5000

Reviews and Comments


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Dr. Syed Faisal Hussain, M.D.
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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.