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 1225033111

Mark TsaiM.D.

PRACTICEKOUNG Y CHEN MD, A PROFESSIONAL CORPORATIONSee all providers at this practice →
Internal MedicineParamount, CAI
CROSS-REFERENCE

Related data on other Healthparse brands

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

Hospital & Facility Affiliations (2)

CCN 059019
Home health agency
CCN 050348
Hospital
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
561
Unique beneficiaries
—
Total services
998
Distinct HCPCS
10
Medicare payment
$54K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 10,499 Internal Medicine providers in CA — above median (cohort median 531).
REFERRAL NETWORK

Where Mark Tsai'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 · 8 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
Primex Clinical Laboratories Inc.
Clinical Laboratory · Van Nuys, CA
65167
ST.FRANCIS MEDICAL CENTER2778
Unilab Corporation
Clinical Laboratory · West Hills, CA
2172
UNIVERSITY OF CALIFORNIA IRVINE2077
Wen-Yuan Chiang
Nephrology · South Gate, CA
20220
NPI 12553355351381
TOTAL RENAL CARE INC1278
Refers patients to
Outbound — where patients go next
PhysicianPatientsVisits
Unilab Corporation
Clinical Laboratory · West Hills, CA
3685
Wen-Yuan Chiang
Nephrology · South Gate, CA
23207
ST.FRANCIS MEDICAL CENTER2270
Christopher Lee
Diagnostic Radiology · Orange, CA
1872
UNIVERSITY OF CALIFORNIA IRVINE1854
NPI 12553355351266
TOTAL RENAL CARE INC1170
Primex Clinical Laboratories Inc.
Clinical Laboratory · Van Nuys, CA
1129
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.
QUALITY · MIPS · 2024
No data available for this provider in 2024.
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
Total received
$2K
Payment records
64
By payment type
Food and Beverage$2K
Education$90
PRESCRIBING · PART D · 2024
Total Rx claims
8,744
Beneficiaries
—
Total drug cost
$851K
Distinct drugs
138
Brand share
20.4%
Top prescribed drugs
Atorvastatin Calcium445 claims
Metformin Hcl436 claims
Amlodipine Besylate397 claims
Losartan Potassium266 claims
Albuterol Sulfate248 claims