Tammy Vien, RN
NPI 1285234195 · Registered Nurse · Oakland, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tammy Vien, RN is a Registered Nurse provider in Oakland, CA (NPI 1285234195).
Provider details
- NPI number
- 1285234195
- Entity type
- Individual
- Primary specialty
- Registered NurseNursing Service Providers
- Credential
- RN
- Sex
- Female
- Sole proprietor
- No
- License
- 95230893 (CA)
Specialties & taxonomies
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-10-29
- Last updated
- 2020-10-29
- Certified
- 2020-10-29
Frequently asked questions
- What is Tammy Vien's NPI number?
- Tammy Vien's National Provider Identifier (NPI) is 1285234195, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tammy Vien's specialty?
- Tammy Vien is listed in the NPPES registry with a primary specialty of Registered Nurse (Nursing Service Providers).
- Where is Tammy Vien located?
- Tammy Vien's practice location on file with NPPES is 818 Webster St, Oakland, CA 94607-4220.
- What is Tammy Vien's phone number?
- The practice phone number listed in the NPPES registry for Tammy Vien is (510) 986-6800.
- Does Tammy Vien accept Medicare?
- Tammy Vien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tammy Vien's NPI active?
- Yes — Tammy Vien's NPI (1285234195) is active in the NPPES registry as of the last update on 2020-10-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.