Tammy Vien, RN - Medicare Nurse Practitioner in Oakland, CA

Tammy Vien, RN is a medicare enrolled "Registered Nurse" in Oakland, California. She graduated from nursing school in 2025 and has 1 years of diverse experience with area of expertise as Nurse Practitioner. She is a member of the group practice Asian Health Services and her current practice location is 818 Webster St, Oakland, California. You can reach out to her office (for appointments etc.) via phone at (510) 986-6800.

Tammy Vien is licensed to practice in California (license number 95230893) 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 1285234195.

Contact Information

Tammy Vien, RN
818 Webster St,
Oakland, CA 94607-4220
(510) 986-6800
Not Available

Map and Direction




Provider's Profile

Full NameTammy Vien
GenderFemale
SpecialityNurse Practitioner
Experience1 Years
Location818 Webster St, Oakland, 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:
  • Tammy Vien graduated from nursing school in 2025
  NPI Data:
  • NPI Number: 1285234195
  • Provider Enumeration Date: 10/29/2020
  • Last Update Date: 10/29/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 4789162447
  • Enrollment ID: I20260203002273

Medical Identifiers

Medical identifiers for Tammy Vien such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1285234195NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
163W00000XRegistered Nurse 95230893 (California)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Asian Health Services024427102193

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. Tammy Vien allows following entities to bill medicare on her behalf.
Entity NameAsian Health Services
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1841331402
PECOS PAC ID: 0244271021
Enrollment ID: O20050523000209

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. Tammy Vien 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
Tammy Vien, RN
2139 Pacific Ave Apt B,
Alameda, CA 94501-1452

Ph: Not Available
Tammy Vien, RN
818 Webster St,
Oakland, CA 94607-4220

Ph: (510) 986-6800

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.