Physician

John F. Brennan, MD

According to 2025 Medicare claims, John Brennan, MD (NPI: 1154351153) practices nephrology in the Racine-Mount Pleasant, WI market, with the plurality of this provider's patient population coming from Racine, WI. This provider's primary affiliated billing organization is ASCENSION MEDICAL GROUP-SOUTHEAST WISCONSIN INC (NPI: 1609881077; TIN: 391791586) and primary practice location at 53403-1176. Brennan is affiliated with the Ascension Care Management Health Partners Wisconsin, LLC (ACO ID: A5329), participating under the MSSP model.

Brennan's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 260 traditional Medicare patients, billed 777 HCPCS/CPT codes, and received $84,452 in Medicare payments. The top billing code was 90960 (Dialysis services, 4 or more physician visits per month (20 years or older)). Part D data shows 4,065 prescription claims across 396 beneficiaries totaling $334,227 in drug costs, led by Xphozah (Tenapanor Hcl). DME data shows 59 claims. Open Payments data shows 5 records totaling $230. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.

Over the past 10 years, this provider's Medicare Part B carrier billing has declined steadily, from $165,313 to $84,452. Similarly, Part D prescription costs have declined steadily, from $539,772 to $334,227. In contrast, DME billing represents a smaller volume and started with an early spike, then settled into a lower baseline, moving from $5,102 to $1,488.

Part B Carrier Billing Trend

Medicare payment trend, with N of patients and claim lines in the table.

Year	Patients	Clm Lines	Payment
2015	512	1,711	$165,313
2016	494	1,550	$134,861
2017	487	1,729	$173,444
2018	472	1,762	$183,884
2019	464	1,788	$183,690
2020	423	1,526	$163,309
2021	383	1,257	$147,781
2022	312	946	$110,183
2023	278	843	$107,581
2024	260	777	$84,452

Part D Events Trend

Drug cost trend, with N of patients and prescription claims in the table.

Year	Patients	Claims	Drug Cost
2015	379	5,887	$539,772
2016	372	5,207	$518,390
2017	365	4,864	$569,626
2018	374	4,559	$391,182
2019	362	4,217	$346,330
2020	369	3,831	$286,937
2021	375	3,752	$262,504
2022	363	3,769	$374,898
2023	376	3,861	$350,001
2024	396	4,065	$334,227

DME Billing Trend

Medicare payment trend, with N of patients and DME claim records in the table.

Year	Patients	Claims	Payment
2015	35	182	$6,017
2016	19	151	$4,752
2017	13	116	$3,181
2018	12	73	$2,272
2019	N/R	72	$2,067
2020	N/R	26	$418
2021	N/R	13	$193
2022	N/R	55	$2,420
2023	N/R	55	$910
2024	N/R	59	$843

* / # = suppressed by CMS; 0 = reported zero; N/R = not reported or blank.

Top 5 Part B carrier billing codes in 2024

By total payments.

Code	Description	Patients	Clm Lines	Total Payment
90960	Dialysis services, 4 or more physician visits per month (20 years or older)	47	137	$262
90961	Dialysis services, 2-3 physician visits per month (20 years or older)	41	59	$218
99221	Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes	23	25	$60
99213	Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more	143	260	$43
99231	Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes	37	92	$35

Top 5 Part D drugs in 2024

By total drug costs.

Drug	Generic	Claims	Total Day Supply	Total Drug Cost
Xphozah	Tenapanor Hcl	32	1,080	$99,834
Lokelma	Sodium Zirconium Cyclosilicate	37	1,161	$21,632
Sevelamer Carbonate	Sevelamer Carbonate	146	6,468	$20,373
Jardiance	Empagliflozin	14	840	$16,871
Veltassa	Patiromer Calcium Sorbitex	17	583	$10,128

Top 5 DME services in 2024

By Total Medicare Payment Amount.

HCPCS Code	HCPCS Description	Supplier Rental Indicator	Total Supplier Beneficiaries	Total Supplier Claims	Total Medicare Payment Amount
Q0511	Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period	N	N/R	18	$301
J7517	Mycophenolate mofetil, oral, 250 mg	N	N/R	21	$278
Q0512	Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for a subsequent prescription in a 30-day period	N	N/R	20	$263

Open Payments Summary in 2024

Category	Definition	Records	Total Reported Amount	Top Related Entity
General Payments	Reported payment or transfer-of-value amount.	5	$230	Baxter Healthcare
Research Payments	Reported research-related payment or transfer-of-value amount.	0	$0	N/R
Ownership / Investment Interests	Reported value of ownership or investment interests.	0	$0	N/R

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FAQ

What Medicare data is available for John F. Brennan, MD?

Tedicare shows public-source Medicare data for John F. Brennan, MD (NPI 1154351153), including provider identity, specialty, market context, Medicare Part B activity, Part D prescribing, DME records, Open Payments where available, billing organization details, and ACO affiliation signals where available. Profile data covers 2015-2024, with current attribution based on 2025 claims where available.

Does John F. Brennan, MD have ACO affiliation data?

John F. Brennan, MD is shown with ACO affiliation data for Ascension Care Management Health Partners Wisconsin, LLC (MSSP, ACO ID A5329).

What billing organization is linked to John F. Brennan, MD?

John F. Brennan, MD is linked to ASCENSION MEDICAL GROUP-SOUTHEAST WISCONSIN INC (billing NPI 1609881077) in the available physician profile data.

Does John F. Brennan, MD have Open Payments data?

John F. Brennan, MD has 5 connected Open Payments records in the available 2024 summary data.

Can I download physician-level Medicare data from Tedicare?

Yes. Tedicare provides sample physician export data and paid custom physician data exports for research, planning, outreach, and market analysis. Exports can include physician profile fields, market and specialty context, billing organization details, ACO affiliation signals where available, and Medicare utilization data.