Vivian Chau, OD
NPI 1558052951 · Optometrist · Rosemead, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vivian Chau, OD is a Optometrist provider in Rosemead, CA (NPI 1558052951).
Provider details
- NPI number
- 1558052951
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 35427 (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
3 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
83 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 39 | $97 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 30 | $62 |
| Established Patient Complete Exam of Visual System92014 | 14 | $135 |
Typical Medicare-allowed amounts for these services range $62–$135 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 196 | 64 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 48 | 18 |
| Prednisolone Acetate | 41 | 31 |
| Brimonidine Tartrate | 31 | — |
| Bimatoprostbrand: Lumigan | 28 | — |
| Timolol Maleate | 28 | — |
| Ketorolac Tromethamine | 21 | 18 |
| Ofloxacin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$100 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 11525 Brookshire Ave Ste 201aDowney, CA 90241-4985Phone: (800) 898-2020
- 2400 N BroadwayLos Angeles, CA 90031-2219Phone: (800) 898-2020
Registry dates
- Enumerated
- 2023-05-16
- Last updated
- 2023-08-15
- Certified
- 2023-08-15
Frequently asked questions
- What is Vivian Chau's NPI number?
- Vivian Chau's National Provider Identifier (NPI) is 1558052951, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vivian Chau's specialty?
- Vivian Chau is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Vivian Chau located?
- Vivian Chau's practice location on file with NPPES is 1535 Owens Ct, Rosemead, CA 91770-1182.
- What is Vivian Chau's phone number?
- The practice phone number listed in the NPPES registry for Vivian Chau is (626) 757-3129.
- Does Vivian Chau accept Medicare?
- Vivian Chau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vivian Chau's NPI active?
- Yes — Vivian Chau's NPI (1558052951) is active in the NPPES registry as of the last update on 2023-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.