What is Gregory Warren's specialty?

Gregory Warren (NPI 1649262544) is a Medicare-billing provider whose primary specialty is Nephrology in Milwaukee, WI.

Where does Gregory Warren practice?

Gregory Warren practices in Milwaukee, WI, based on the location reported in the CMS Medicare provider datasets for NPI 1649262544.

How much does Medicare pay Gregory Warren?

Gregory Warren (NPI 1649262544) received approximately $45K in total Medicare Part B payments, serving 195 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1649262544

Gregory WarrenMD

NephrologyMilwaukee, WII

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

206

Unique beneficiaries

—

Total services

376

Distinct HCPCS

Medicare payment

$41K

Peer benchmark

Total Medicare services vs. 145 Nephrology providers in WI — below median (cohort median 835).

PRESCRIBING · PART D · 2024

Total Rx claims

1,005

Beneficiaries

—

Total drug cost

$161K

Distinct drugs

Brand share

17.6%

Top prescribed drugs

Calcitriol152 claims

Losartan Potassium104 claims

Furosemide94 claims

Amlodipine Besylate91 claims

Terazosin Hcl73 claims

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

Physician	Patients	Visits
Kathleen Uy Nephrology · Milwaukee, WI	226	1,104
Vasundhara Ganne Nephrology · Milwaukee, WI	211	1,098
Ryan Hilbelink Diagnostic Radiology · St Francis, WI	120	385
Joseph Whitnah Diagnostic Radiology · New Berlin, WI	114	359
William Macdonald Diagnostic Radiology · St Francis, WI	92	278
NPI 1417930827	85	214
Vikram Nangia Clinical Cardiac Electrophysiology · Milwaukee, WI	78	260
Lynn Gilles Diagnostic Radiology · Milwaukee, WI	77	205
Andrew Simon Diagnostic Radiology · St Francis, WI	77	277
Bell Ambulance, Inc. Ambulance Service Provider · Milwaukee, WI	76	602
Robert Neimon Diagnostic Radiology · Milwaukee, WI	73	250
Deepak Sharma Nephrology · Milwaukee, WI	70	186

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.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events