Tammy Vien, RN
Registered Nurse · Oakland, CA
Tammy Vien, RN is a registered nurse with a practice address in Oakland, California, and NPI 1285234195, issued on Oct 29, 2020. Check the license (California 95230893, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Tammy Vien
- Credential
- RN
- Primary taxonomy
- Registered Nurse 163W00000X
- License number
- 95230893 CA
Self-reported in NPPES; status is on the state search - Practice location
- 818 Webster St, Oakland, CA 94607
- Phone
- (510) 986-6800
- Enumerated
- Oct 29, 2020
- Record last updated
- Oct 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20260203002273); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest registered nurse records → All 13,506 in California → Look up another NPI →
Also registered at 818 Webster St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Tammy Vien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 95230893Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Asian Health ServicesOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tammy Vien among 13,506 registered nurse records in California
Tammy Vien, RN is one of 13,506 registered nurse records with a practice address in California. 3% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 48% of them.
- NPI issued2020 · 48% of these records are older, 47% newer
- In a Medicare fileYes · 3% of these records are
- In the CMS Doctors and Clinicians fileYes · 1% of these records are
- Graduated2025 · median 2018 among the 146 with a school on file
- Record last updated2020 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 163W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
436 registered nurse records list a practice address in Oakland
They are 436 of the 18,558 NPPES records with a practice address in Oakland, and 13,506 registered nurse records in California.
All 13,506 in California → Every provider in Oakland → Registered Nurse nationwide →
The 8 registered nurse records with the nearest ZIP codes
- Ty Breathe, RNOakland, CA 946071265850713
- Florence ChanOakland, CA 946071649827593
- Megan CheungOakland, CA 946071699321364
- Yuk Pui ChingOakland, CA 946071316594443
- Connie Chiu, RNOakland, CA 946071629627310
- Dustin Heaton, RNOakland, CA 946071073025342
- Felicia House, RNOakland, CA 946071316187990
- Jessica McCoyOakland, CA 946071437568854
Common questions
What is Tammy Vien, RN's NPI number?
Tammy Vien, RN's National Provider Identifier (NPI) is 1285234195, issued on Oct 29, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Tammy Vien, RN located?
The NPPES record lists a practice address at 818 Webster St, Oakland, CA, 94607. Phone: (510) 986-6800. Providers update this record themselves, so call before visiting.
How can I verify Tammy Vien, RN's license?
NPPES lists California license number 95230893, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.