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PROVIDER PROFILE · NPI 1053321943

David ChapmanM.D.

PRACTICEINTERNAL MEDICAL GROUPSee all providers at this practice →
GastroenterologyYorba Linda, CAI
CROSS-REFERENCE

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FACILITY AFFILIATIONS

Hospital & Facility Affiliations (2)

CCN 050168
Hospital
CCN 050348
Hospital
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
226
Unique beneficiaries
—
Total services
255
Distinct HCPCS
8
Medicare payment
$27K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 1,398 Gastroenterology providers in CA — bottom quintile (cohort median 750).
PRESCRIBING · PART D · 2024
Total Rx claims
204
Beneficiaries
—
Total drug cost
$32K
Distinct drugs
8
Brand share
8.3%
Top prescribed drugs
Omeprazole62 claims
Esomeprazole Magnesium53 claims
Pantoprazole Sodium22 claims
Lipase/Protease/Amylase17 claims
Lactulose14 claims
QUALITY · MIPS · 2024
No data available for this provider in 2024.
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
Total received
$291
Payment records
2
By payment type
Food and Beverage$291
REFERRAL NETWORK

Where David Chapman'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). 19 inbound referrers · 45 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
Kamini Malhotra, M.D Inc
Clinical Laboratory · Fountain Valley, CA
81190
Unilab Corporation
Clinical Laboratory · West Hills, CA
43161
ST JUDE HOSPITAL INC38104
Victor Lee
Pathology · Oceanside, CA
2574
Emergency Ambulance Service Inc
Ambulance Service Provider · Brea, CA
2447
Darice Liu
Interventional Radiology · Orange, CA
2443
John Kirby
Diagnostic Radiology · Anaheim, CA
2375
Hao Ngo
Diagnostic Radiology · Fullerton, CA
2339
Danh Nguyen
Diagnostic Radiology · Riverside, CA
2239
Manisha Goel
Internal Medicine · Fullerton, CA
2160
Michael Chan
Diagnostic Radiology · San Diego, CA
2136
Bruce Omiya
Diagnostic Radiology · Anaheim, CA
1734
Refers patients to
Outbound — where patients go next
PhysicianPatientsVisits
UNIVERSITY OF CALIFORNIA IRVINE177490
ST JUDE HOSPITAL INC52133
Kamini Malhotra, M.D Inc
Clinical Laboratory · Fountain Valley, CA
5271
Unilab Corporation
Clinical Laboratory · West Hills, CA
44168
Laboratory Corporation Of America
Clinical Laboratory · San Diego, CA
4391
Thomas Lee
Diagnostic Radiology · Anaheim, CA
3583
ST JUDE HOSPITAL INC3247
Manisha Goel
Internal Medicine · Fullerton, CA
3280
John Zamarra
Internal Medicine · Laguna Beach, CA
31166
Falck Mobile Health Corp
Ambulance Service Provider · Orange, CA
3051
Michael Brand
Diagnostic Radiology · Anaheim, CA
2855
KIM, YOUN2765
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.