What is Vivian Lo's specialty?

Vivian Lo (NPI 1003167453) is a Medicare-billing provider whose primary specialty is Physician Assistant in Concord, CA.

Where does Vivian Lo practice?

Vivian Lo practices in Concord, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1003167453.

How much does Medicare pay Vivian Lo?

Vivian Lo (NPI 1003167453) received approximately $14K in total Medicare Part B payments, serving 73 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1003167453

Vivian LoPA-C

PRACTICEFRED J VON STIEFF MD A PROFESSIONAL CORPORATIONSee all providers at this practice →

Physician AssistantConcord, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

152

Distinct HCPCS

Medicare payment

$13K

Peer benchmark

Total Medicare services vs. 7,073 Physician Assistant providers in CA — below median (cohort median 224).

PRESCRIBING · PART D · 2024

Total Rx claims

1,552

Beneficiaries

—

Total drug cost

$345K

Distinct drugs

Brand share

10.2%

Top prescribed drugs

Mirtazapine217 claims

Duloxetine Hcl211 claims

Gabapentin173 claims

Divalproex Sodium142 claims

Risperidone124 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$33

Payment records

By payment type

Food and Beverage$33

Top paying entities

Food and Beverage$33

REFERRAL NETWORK

Where Vivian Lo's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 7 inbound referrers · 9 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Yong Liu Internal Medicine · San Francisco, CA	20	108
Linda Damico Nurse Practitioner · Richmond, CA	18	27
ZISMAN, KATERINA	14	14
Elaine Gecht Internal Medicine · San Francisco, CA	12	50
Wei Rao Internal Medicine · San Francisco, CA	12	28
GRANDINETTI, GAIL	12	13
Ka Kam Chan Internal Medicine · San Francisco, CA	12	56

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
MDX-MDL HOLDINGS, LLC	31	235
David Tran Podiatry · San Francisco, CA	30	47
KINDRED NURSING CENTERS WEST, LLC	22	85
Yong Liu Internal Medicine · San Francisco, CA	21	86
Community Mobile Diagnostics Llc Portable X-Ray Supplier · San Leandro, CA	17	48
ZISMAN, KATERINA	17	19
Linda Damico Nurse Practitioner · Richmond, CA	16	33
Elaine Gecht Internal Medicine · San Francisco, CA	12	66
Ka Kam Chan Internal Medicine · San Francisco, CA	11	56

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events