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PROVIDER PROFILE · NPI 1649262544

Gregory WarrenMD

NephrologyMilwaukee, WII
CROSS-REFERENCE

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OIG/SAM exclusion screening, sanctions history
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PRESCRIBING · PART D · 2024
Total Rx claims
1,005
Beneficiaries
—
Total drug cost
$161K
Distinct drugs
21
Brand share
17.6%
Top prescribed drugs
Calcitriol152 claims
Losartan Potassium104 claims
Furosemide94 claims
Amlodipine Besylate91 claims
Terazosin Hcl73 claims
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
206
Unique beneficiaries
—
Total services
376
Distinct HCPCS
5
Medicare payment
$41K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 145 Nephrology providers in WI — below median (cohort median 835).
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 Gregory Warren'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). 177 inbound referrers · 0 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
Kathleen Uy
Nephrology · Milwaukee, WI
2261,104
Vasundhara Ganne
Nephrology · Milwaukee, WI
2111,098
Ryan Hilbelink
Diagnostic Radiology · St Francis, WI
120385
Joseph Whitnah
Diagnostic Radiology · New Berlin, WI
114359
William Macdonald
Diagnostic Radiology · St Francis, WI
92278
NPI 141793082785214
Vikram Nangia
Clinical Cardiac Electrophysiology · Milwaukee, WI
78260
Lynn Gilles
Diagnostic Radiology · Milwaukee, WI
77205
Andrew Simon
Diagnostic Radiology · St Francis, WI
77277
Bell Ambulance, Inc.
Ambulance Service Provider · Milwaukee, WI
76602
Robert Neimon
Diagnostic Radiology · Milwaukee, WI
73250
Deepak Sharma
Nephrology · Milwaukee, WI
70186
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.