Dr. John F. Brennan, MD
- Medicare services, 2024
- 702
- Medicare patients, 2024
- 260
- Part D claims, 2024
- 4,065
- MIPS score, 2024
- 75
- Hospital affiliations
- 3
- Practice address
- 400 W River Woods Pkwy, Milwaukee, WI 53212
- Practice phone
- Call (262) 632-0120
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Harbor View Dialysis
Milwaukee, Wisconsin
Find Dr. Brennan'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. John F. Brennan is a nephrologist in Milwaukee, Wisconsin
Dr. Brennan practices at Harbor View Dialysis in Milwaukee, Wisconsin.
Dr. Brennan's NPI, 1154351153, was assigned on July 4, 2006. Dr. Brennan graduated from Chicago Medical School/Rosalind Franklin University of Medicine Science in 1991. Dr. Brennan holds Wisconsin license 37698.
- NPI
- 1154351153NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375647894
- NPI enumeration date
- July 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (262) 632-0120
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 61
- Medical school graduation
- 1991
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John F. Brennan practices at Harbor View Dialysis in Milwaukee, Wisconsin
Dr. Brennan's primary practice is Harbor View Dialysis, at 400 W River Woods Pkwy, Milwaukee, WI 53212 in Milwaukee County. The practice phone is (262) 632-0120.
- Harbor View Dialysis400 W River Woods Pkwy, Milwaukee, WI 53212 · Milwaukee CountyPhone(262) 632-0120
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John F. Brennan is affiliated with 10 sites of care and 2 medical groups
Dr. Brennan's primary practice is Harbor View Dialysis in Milwaukee, Wisconsin. Dr. Brennan is also affiliated with Ascension SE Wisconsin Hospital - St. Joseph. The medical group on file is Ascension Medical Group. Dmand AI also links Dr. Brennan to 2 more hospitals, 2 dialysis centers, 2 group practices and clinics, 2 home health agencies and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John F. Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harbor View Dialysis | Available with a free account |
| +9 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John F. Brennan is one of 168 nephrologists in Wisconsin
Nephrology is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Brennan is board certified in internal medicine by the American Board of Internal Medicine. Dr. Brennan is licensed in Wisconsin.
Specialties and state licenses
- Nephrology, WisconsinPrimary
Clinical focus
Dmand AI lists acute kidney failure, chronic kidney disease, fluid and electrolyte imbalances, hypercalcemia and kidney disease among the conditions Dr. Brennan treats.
Nephrologists near Dr. Brennan
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. John F. Brennan billed Medicare for 702 services in 2024
CMS data shows 702 Medicare services from Dr. Brennan across 10 procedure codes in 2024, for 260 Medicare patients. Medicare paid $82,010 for them.
Dr. Brennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4372024: 439No change
- Tests and treatments
- 2023: 3532024: 26325%
Where Dr. Brennan's Medicare services took place, 2024
- In an office26337%
- In a facility43963%
Dr. Brennan compared with the Wisconsin median for nephrologists, 2024
- Dr. Brennan
- Wisconsin median
- Medicare services
- 702vs 677Close to median
- Medicare patients
- 260vs 23610% above
- Part D claims
- 3,616vs 6515.6 times
Medians across 167 nephrologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Brennan'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. Brennan and other nephrologists in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John F. Brennan treated 260 Medicare patients in 2024, average age 72
CMS counts 260 Medicare patients who saw Dr. Brennan in 2024. The largest group is 75 to 84, with 81 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 30% are also on Medicaid. Their average risk score is 3.80, 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. Brennan's median patient age at 71, with 48% women.
Dr. Brennan's Medicare patients by age, 2024
Dr. Brennan's Medicare patients by sex, 2024
- Women12749%
- Men13351%
Chronic conditions among Dr. Brennan's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes56%
- Arthritis50%
- Ischemic heart disease37%
- Heart failure35%
- Atrial fibrillation29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Brennan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John F. Brennan wrote 4,065 Medicare Part D claims in 2024
In 2024, Dr. Brennan wrote 4,065 Medicare Part D claims for 396 patients. 92% of them were for generic drugs. CMS names the drug for 3,616 of them, across 77 drugs with 11 or more claims each, at $250,866 in total drug cost. In 2023, CMS named 3,396 claims across 74 drugs.
Dr. Brennan's Part D claims by kind of drug, 2024
- Generic3,740 claims92%
- Brand-name312 claims8%
- Other13 claims0%
Dr. Brennan'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.
Drug classes CMS tracks in Dr. Brennan's Part D claims, 2024
- Antibiotics2%100 of 4,065 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,3962024: 3,6166%
Drugs named by CMS: 77 in 2024, 74 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
Dr. John F. Brennan scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Brennan for performance year 2024, reported through an alternative payment model (APM). Dr. Brennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
- MIPS final score, 2024
- 75 of 100
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. John F. Brennan received $1,536 in industry payments from 2016 to 2024
CMS Open Payments shows 72 general payments to Dr. Brennan from 29 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 86% of the total. Baxter Healthcare paid the most, $246.
General payments to Dr. Brennan by program year, 2016 to 2024
General payments to Dr. Brennan by kind, 2016 to 2024
- Food and beverage$1,31986%
- Education$21714%
Companies that paid Dr. Brennan the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John F. Brennan has 1 award and honors on record
Dmand AI lists 1 award for Dr. Brennan, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Brennan
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. John F. Brennan graduated from Chicago Medical School/Rosalind Franklin University of Medicine Science
Dr. Brennan graduated from Chicago Medical School/Rosalind Franklin University of Medicine Science in 1991.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. John F. Brennan accepts plans from 15 insurance carriers
Dr. Brennan is in network with 15 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Elevance
- HCSC
- Molina
- Regence Health Plans
- Alliant Health Plans
- +7 more carriersWith a free account
Plan types Dr. Brennan accepts, by number of carriers
- PPO8
- HMO7
- Medicare6
- EPO4
- POS4
- Medicaid2
Source: Dmand AI Insurance Network Data
Sources for Dr. John F. Brennan'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 DataDmand AI Org Hierarchy 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| 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. John F. Brennan
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. John F. Brennan's NPI number?
Dr. John F. Brennan's NPI number is 1154351153. It was assigned on July 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John F. Brennan?
Dr. John F. Brennan is a nephrologist in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. John F. Brennan practice?
Dr. Brennan practices at 400 W River Woods Pkwy, Milwaukee, WI 53212. Dr. Brennan's primary practice is Harbor View Dialysis in Milwaukee, Wisconsin. Dmand AI also links Dr. Brennan to 2 hospitals, 2 dialysis centers, 2 group practices and clinics, 2 home health agencies and 1 medical group.
What is Dr. John F. Brennan's office phone number?
The practice phone on file for Dr. Brennan is (262) 632-0120.
What is Dr. John F. Brennan's medical license number?
Dr. Brennan holds Wisconsin license 37698.
Which hospitals is Dr. John F. Brennan affiliated with?
Dr. Brennan is affiliated with Ascension SE Wisconsin Hospital - St. Joseph. Dmand AI links Dr. Brennan to 2 more hospitals.
What medical group is Dr. John F. Brennan part of?
Dr. Brennan is linked to Ascension Medical Group. Dmand AI links Dr. Brennan to 1 more medical group.
Does Dr. John F. Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 702 services in 2024, and Dr. Brennan accepts Medicare assignment.
What is Dr. John F. Brennan's MIPS score?
Dr. Brennan's MIPS final score for performance year 2024 is 75 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. John F. Brennan see?
CMS counts 260 Medicare patients who saw Dr. Brennan in 2024, with an average age of 72.
Show 7 more questionsShow fewer questions
Is Dr. John F. Brennan board certified?
Yes. Dr. Brennan is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. John F. Brennan bill to Medicare?
In 2024, Dr. Brennan's most billed Medicare services were office visit, established patient (99213), dialysis (90960) and hospital inpatient care (99231).
Where did Dr. John F. Brennan go to medical school?
Dr. Brennan graduated from Chicago Medical School/Rosalind Franklin University of Medicine Science in 1991.
What drugs does Dr. John F. Brennan prescribe most?
In 2024 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Amlodipine Besylate, Losartan Potassium and Furosemide.
Has Dr. John F. Brennan received payments from drug or device companies?
CMS Open Payments shows $1,536 in general payments to Dr. Brennan from 29 companies from 2016 to 2024. The largest total came from Baxter Healthcare.
How long has Dr. John F. Brennan been practicing?
Dr. Brennan graduated from medical school in 1991, 35 years ago.
What insurance does Dr. John F. Brennan accept?
Dr. Brennan is in network with 15 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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