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 1972506913

William ShafferM.D.

PRACTICEKIDNEY SPECIALISTS OF SOUTH TEXAS, P.A.See all providers at this practice →
NephrologyCorpus Christi, TXI
CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore
OIG/SAM exclusion screening, sanctions history
© 2026 CareTrace
PricingContactPrivacyTerms
QUALITY · MIPS · 2024
No data available for this provider in 2024.
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
Total received
$310
Payment records
16
By payment type
Food and Beverage$310
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
543
Unique beneficiaries
—
Total services
944
Distinct HCPCS
8
Medicare payment
$121K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 883 Nephrology providers in TX — below median (cohort median 1,432).
PRESCRIBING · PART D · 2024
Total Rx claims
3,178
Beneficiaries
—
Total drug cost
$947K
Distinct drugs
46
Brand share
31.4%
Top prescribed drugs
Losartan Potassium361 claims
Dapagliflozin Propanediol310 claims
Empagliflozin305 claims
Amlodipine Besylate297 claims
Labetalol Hcl260 claims
REFERRAL NETWORK

Where William Shaffer'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). 81 inbound referrers · 0 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
NPI 1255335535256869
Karim Nooruddin
Nephrology · Aransas Pass, TX
177421
Geeta Reddy
Nephrology · Corpus Christi, TX
174382
BAY AREA HEALTHCARE GROUP, LTD.106246
Kenneth Vanexan
Diagnostic Radiology · Corpus Christi, TX
83174
GUTIERREZ QUEHL, CARLOS82235
Thomas Ertzner
Diagnostic Radiology · Corpus Christi, TX
75194
Clinical Pathology Laboratories, Inc.
Clinical Laboratory · Austin, TX
58190
GEMINI AMBULANCE SERVICE, INC.57102
Divyang Ayar
Interventional Radiology · Pearland, TX
53122
ISD CORPUS CHRISTI LLC50163
David Saldana
Diagnostic Radiology · Corpus Christi, TX
49140
Refers patients to
Outbound — where patients go next
No outbound pairs above the suppression threshold.
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.