caretrace.iopowered by▸healthparse
SearchCohort Builder
Tools▾
KOL FinderTerritoriesDrug Compare
AI Query
Browse▾
By stateBy specialty
Pricing
SearchCohort BuilderToolsKOL FinderTerritoriesDrug CompareAI QueryBrowseBy stateBy specialtyPricing
PROVIDER PROFILE · NPI 1134144876

Marcus HarrisP.A-C

PRACTICEKAISER FOUNDATION HOSPITALSSee all providers at this practice →
Physician AssistantOntario, CAI
CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore
OIG/SAM exclusion screening, sanctions history
© 2026 CareTrace
PricingContactPrivacyTerms
FACILITY AFFILIATIONS

Hospital & Facility Affiliations (3)

CCN 050426
Hospital
CCN 050586
Hospital
CCN 050758
Hospital
PRESCRIBING · PART D · 2024
Total Rx claims
41
Beneficiaries
—
Total drug cost
$208
Distinct drugs
3
Brand share
34.1%
Top prescribed drugs
Cephalexin16 claims
Hydrocodone/Acetaminophen14 claims
Azithromycin11 claims
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
205
Unique beneficiaries
—
Total services
212
Distinct HCPCS
3
Medicare payment
$21K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 7,073 Physician Assistant providers in CA — above median (cohort median 224).
QUALITY · MIPS · 2024
No data available for this provider in 2024.
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
No data available for this provider in 2024.
REFERRAL NETWORK

Where Marcus Harris'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). 4 inbound referrers · 15 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
POMONA VALLEY HOSPITAL MEDICAL CENTER3774
Hamidreza Torshizy
Diagnostic Radiology · San Diego, CA
1619
Unilab Corporation
Clinical Laboratory · West Hills, CA
1322
SCHAEFER AMBULANCE SERVICE, INC1118
Refers patients to
Outbound — where patients go next
PhysicianPatientsVisits
POMONA VALLEY HOSPITAL MEDICAL CENTER91182
SAN ANTONIO REGIONAL HOSPITAL4268
UHS-CORONA INC3645
Paul Reisch
Diagnostic Radiology · Pomona, CA
2741
SCHAEFER AMBULANCE SERVICE, INC2737
American Medical Response Of Inland Empire
Ambulance Service Provider · Redlands, CA
1621
Daniel Heitz
Diagnostic Radiology · Pomona, CA
1624
Unilab Corporation
Clinical Laboratory · West Hills, CA
1623
Yanle Zhao
Diagnostic Radiology · Pomona, CA
1521
Laboratory Corporation Of America
Clinical Laboratory · San Diego, CA
1420
David Dang
Diagnostic Radiology · Upland, CA
1215
Eddie Lares
Emergency Medicine · Loma Linda, CA
1117
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.