Warren Toshiro Yamashita, MD, MPH - Medicare Family Medicine in Tustin, CA

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Warren Toshiro Yamashita, MD, MPH is a medicare enrolled "Family Medicine - Addiction Medicine" physician in Tustin, California. His current practice location is 1 Hope Dr, Tustin, California. You can reach out to his office (for appointments etc.) via phone at (714) 247-0300.

Warren Toshiro Yamashita is licensed to practice in California (license number A167101) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1982137691.

Contact Information

Warren Toshiro Yamashita, MD, MPH
1 Hope Dr,
Tustin, CA 92782-0221
(714) 247-0300
(714) 259-1598

Map and Direction




Physician's Profile

Full NameWarren Toshiro Yamashita
GenderMale
SpecialityFamily Medicine - Addiction Medicine
Location1 Hope Dr, Tustin, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1982137691
  • Provider Enumeration Date: 04/10/2017
  • Last Update Date: 05/05/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 3678993433
  • Enrollment ID: I20201015002454

Medical Identifiers

Medical identifiers for Warren Toshiro Yamashita such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1982137691NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207QA0401XFamily Medicine - Addiction Medicine A167101 (California)Primary

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. Warren Toshiro Yamashita allows following entities to bill medicare on his behalf.
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659450955
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000757
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699885079
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000784
Entity NameHurtt Family Health Clinic Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1306965587
PECOS PAC ID: 4183764814
Enrollment ID: O20110203000426
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Other Medical Care Group
Entity IdentifiersNPI Number: 1629301346
PECOS PAC ID: 1254244973
Enrollment ID: O20110318000170

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. Warren Toshiro Yamashita 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
Warren Toshiro Yamashita, MD, MPH
14642 Newport Ave Ste 300,
Tustin, CA 92780-6059

Ph: (714) 247-0300		Warren Toshiro Yamashita, MD, MPH
1 Hope Dr,
Tustin, CA 92782-0221

Ph: (714) 247-0300

Reviews and Comments


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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.