Dr. Gregory V. Warren, MD
- Medicare services, 2024
- 376
- Medicare patients, 2024
- 195
- Part D claims, 2024
- 1,193
- Industry payments
- $1,372
- Affiliated sites
- 3
- Practice address
- 3237 S 16th St, Milwaukee, WI 53215
- Practice phone
- Call (414) 649-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Aurora St Lukes Medical Center
Milwaukee, Wisconsin
Find Dr. Warren's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Gregory V. Warren is a nephrologist in Milwaukee, Wisconsin
Dr. Warren practices at Aurora St Lukes Medical Center in Milwaukee, Wisconsin.
Dr. Warren's NPI, 1649262544, was assigned on August 17, 2005. Dr. Warren holds Wisconsin license 26514.
- NPI
- 1649262544NPI Registry (opens in a new tab)
- NPI enumeration date
- August 17, 2005
- NPI status
- Active
- Practice phone
- (414) 649-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Gregory V. Warren practices at Aurora St Lukes Medical Center in Milwaukee, Wisconsin
Dr. Warren's primary practice is Aurora St Lukes Medical Center, at 3237 S 16th St, Milwaukee, WI 53215 in Milwaukee County. The practice phone is (414) 649-6000.
- Aurora St Lukes Medical Center3237 S 16th St, Milwaukee, WI 53215 · Milwaukee CountyPhone(414) 649-6000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory V. Warren is affiliated with 4 sites of care and 3 medical groups
Dr. Warren's primary practice is Aurora St Lukes Medical Center in Milwaukee, Wisconsin. The medical group on file is Aurora Medical Group. Dmand AI also links Dr. Warren to 3 more group practices and clinics and 2 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory V. Warren's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Warren practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Aurora St Lukes Medical Center | Available with a free account |
| +3 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory V. Warren is one of 168 nephrologists in Wisconsin
Nephrology is Dr. Warren's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Warren is licensed in Wisconsin.
Specialties and state licenses
- Nephrology, WisconsinPrimary
Nephrologists near Dr. Warren
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory V. Warren billed Medicare for 376 services in 2024
CMS data shows 376 Medicare services from Dr. Warren across 5 procedure codes in 2024, for 195 Medicare patients. Medicare paid $40,712 for them.
Dr. Warren's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4732024: 31778%
- Tests and treatments
- 2023: 6352024: 5991%
Where Dr. Warren's Medicare services took place, 2024
- In an office15742%
- In a facility21958%
Dr. Warren compared with the Wisconsin median for nephrologists, 2024
- Dr. Warren
- Wisconsin median
- Medicare services
- 376vs 67744% below
- Medicare patients
- 195vs 23617% below
- Part D claims
- 1,005vs 65154% above
Medians across 167 nephrologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Warren's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Warren and other nephrologists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory V. Warren treated 195 Medicare patients in 2024, average age 74
CMS counts 195 Medicare patients who saw Dr. Warren in 2024. The largest group is 65 to 74, with 77 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 23% are also on Medicaid. Their average risk score is 4.23, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Warren's median patient age at 65, with 44% women.
Dr. Warren's Medicare patients by age, 2024
Dr. Warren's Medicare patients by sex, 2024
- Women8443%
- Men11157%
Chronic conditions among Dr. Warren's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Heart failure64%
- Ischemic heart disease64%
- Diabetes59%
- Arthritis54%
- Atrial fibrillation48%
Share of Medicare patients with each condition. A patient can have several.
Dr. Warren's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women44%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory V. Warren wrote 1,193 Medicare Part D claims in 2024
In 2024, Dr. Warren wrote 1,193 Medicare Part D claims for 274 patients. 86% of them were for generic drugs. CMS names the drug for 1,005 of them, across 21 drugs with 11 or more claims each, at $161,238 in total drug cost. In 2023, CMS named 1,920 claims across 33 drugs.
Dr. Warren's Part D claims by kind of drug, 2024
- Generic1,031 claims86%
- Brand-name162 claims14%
Dr. Warren's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,9202024: 1,00548%
Drugs named by CMS: 21 in 2024, 33 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Gregory V. Warren received $1,372 in industry payments from 2017 to 2022
CMS Open Payments shows 16 general payments to Dr. Warren from 10 drug and device companies from 2017 to 2022. Food and beverage make up the largest share, 90% of the total. Amgen Inc. paid the most, $478.
General payments to Dr. Warren by program year, 2017 to 2022
General payments to Dr. Warren by kind, 2017 to 2022
- Food and beverage$1,23290%
- Education$14010%
Companies that paid Dr. Warren the most, 2017 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Gregory V. Warren's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory V. Warren
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory V. Warren's NPI number?
Dr. Gregory V. Warren's NPI number is 1649262544. It was assigned on August 17, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory V. Warren?
Dr. Gregory V. Warren is a nephrologist in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Gregory V. Warren practice?
Dr. Warren practices at 3237 S 16th St, Milwaukee, WI 53215. Dr. Warren's primary practice is Aurora St Lukes Medical Center in Milwaukee, Wisconsin. Dmand AI also links Dr. Warren to 3 group practices and clinics and 2 medical groups.
What is Dr. Gregory V. Warren's office phone number?
The practice phone on file for Dr. Warren is (414) 649-6000.
What is Dr. Gregory V. Warren's medical license number?
Dr. Warren holds Wisconsin license 26514.
What medical group is Dr. Gregory V. Warren part of?
Dr. Warren is linked to Aurora Medical Group. Dmand AI links Dr. Warren to 2 more medical groups.
Does Dr. Gregory V. Warren accept Medicare?
Yes. CMS data shows Dr. Warren billed Medicare for 376 services in 2024.
How many Medicare patients does Dr. Gregory V. Warren see?
CMS counts 195 Medicare patients who saw Dr. Warren in 2024, with an average age of 74.
What services does Dr. Gregory V. Warren bill to Medicare?
In 2024, Dr. Warren's most billed Medicare services were hospital inpatient care (99233), office visit, established patient (99214) and dialysis (90960).
What drugs does Dr. Gregory V. Warren prescribe most?
In 2024 Medicare Part D data, Dr. Warren's most prescribed drugs by claims were Calcitriol, Losartan Potassium and Furosemide.
Has Dr. Gregory V. Warren received payments from drug or device companies?
CMS Open Payments shows $1,372 in general payments to Dr. Warren from 10 companies from 2017 to 2022. The largest total came from Amgen Inc.
How long has Dr. Gregory V. Warren been practicing?
Dr. Warren graduated from medical school in 1975, 51 years ago.
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