Vivian Lo, PA-C
NPI 1003167453 · Physician Assistant · Concord, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Vivian Lo, PA-C is a Physician Assistant provider in Concord, CA (NPI 1003167453).
Provider details
- NPI number
- 1003167453
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- No
- License
- PA22434 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 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
152 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 Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 79 | $105 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 60 | $111 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 13 | $156 |
Typical Medicare-allowed amounts for these services range $105–$156 (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 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mirtazapine | 217 | 26 |
| Duloxetine Hcl | 211 | 14 |
| Gabapentin | 173 | 18 |
| Divalproex Sodium | 142 | 12 |
| Risperidone | 124 | — |
| Trazodone Hcl | 117 | 16 |
| Escitalopram Oxalate | 107 | 14 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-09-25
- Last updated
- 2012-09-25
Frequently asked questions
- What is Vivian Lo's NPI number?
- Vivian Lo's National Provider Identifier (NPI) is 1003167453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Vivian Lo's specialty?
- Vivian Lo is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Vivian Lo located?
- Vivian Lo's practice location on file with NPPES is 2481 Pacheco St, Concord, CA 94520-2019.
- What is Vivian Lo's phone number?
- The practice phone number listed in the NPPES registry for Vivian Lo is (925) 680-8933.
- Does Vivian Lo accept Medicare?
- Vivian Lo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Vivian Lo's NPI active?
- Yes — Vivian Lo's NPI (1003167453) is active in the NPPES registry as of the last update on 2012-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.