Vivien Sun, MD
NPI 1902243520 · Hospitalist Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vivien Sun, MD is a Hospitalist Physician provider in Palo Alto, CA (NPI 1902243520).
Provider details
- NPI number
- 1902243520
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A134552 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
13 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 505 Parnassus Ave Box 0110San Francisco, CA 94143-0110Phone: (415) 476-5001
Registry dates
- Enumerated
- 2013-05-23
- Last updated
- 2024-04-28
- Certified
- 2024-04-28
Frequently asked questions
- What is Vivien Sun's NPI number?
- Vivien Sun's National Provider Identifier (NPI) is 1902243520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vivien Sun's specialty?
- Vivien Sun is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Vivien Sun located?
- Vivien Sun's practice location on file with NPPES is 725 Welch Rd, Palo Alto, CA 94304-1601.
- What is Vivien Sun's phone number?
- The practice phone number listed in the NPPES registry for Vivien Sun is (650) 497-8000.
- Does Vivien Sun accept Medicare?
- Vivien Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vivien Sun's NPI active?
- Yes — Vivien Sun's NPI (1902243520) is active in the NPPES registry as of the last update on 2024-04-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.