Vivian to, DO
NPI 1043899230 · Hospitalist Physician · Downey, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vivian to, DO is a Hospitalist Physician provider in Downey, CA (NPI 1043899230).
Provider details
- NPI number
- 1043899230
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 20A21692 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
5 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
100 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 47 | $123 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 24 | $99 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 18 | $120 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 11 | $179 |
Typical Medicare-allowed amounts for these services range $99–$179 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 66 | 28 |
| Lisinopril | 27 | 13 |
| Metformin Hcl | 25 | 11 |
| Levothyroxine Sodium | 23 | — |
| Fluticasone Propionate | 19 | 14 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 18 | — |
| Albuterol Sulfate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-05
- Last updated
- 2025-10-29
- Certified
- 2025-10-29
Frequently asked questions
- What is Vivian to's NPI number?
- Vivian to's National Provider Identifier (NPI) is 1043899230, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vivian to's specialty?
- Vivian to is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Vivian to located?
- Vivian to's practice location on file with NPPES is 11500 Brookshire Ave, Downey, CA 90241-4917.
- What is Vivian to's phone number?
- The practice phone number listed in the NPPES registry for Vivian to is (562) 904-5000.
- Does Vivian to accept Medicare?
- Vivian to is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vivian to's NPI active?
- Yes — Vivian to's NPI (1043899230) is active in the NPPES registry as of the last update on 2025-10-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.