Deep Brain StimulationParkinson Disease
Dr. Ryan Tomas Brennan, DO
NPI1649561978PAC ID0042527764
- Medicare services, 2024
- 667
- Medicare patients, 2024
- 213
- Part D claims, 2024
- 2,865
- Publications
- 2
- Hospital affiliations
- 1
- Practice address
- 9200 W Wisconsin Ave, Milwaukee, WI 53226
- Practice phone
- Call (414) 805-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Brennan's professional email, personal email and mobile number
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Dr. Ryan Tomas Brennan is a neurologist in Milwaukee, Wisconsin
Dr. Brennan practices at Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health.
Dr. Brennan's NPI, 1649561978, was assigned on April 20, 2011. Dr. Brennan graduated from Michigan State University College Of Osteopathic Medicine in 2011. Dr. Brennan holds Wisconsin license 60539.
NPI and contact details
- NPI
- 1649561978NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0042527764
- NPI enumeration date
- April 20, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (414) 805-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ryan Tomas Brennan practices at Froedtert Hospital in Milwaukee, Wisconsin
Dr. Brennan's primary practice is Froedtert Hospital, at 9200 W Wisconsin Ave, Milwaukee, WI 53226 in Milwaukee County. The practice phone is (414) 805-3000.
- Froedtert Hospital9200 W Wisconsin Ave, Milwaukee, WI 53226 · Milwaukee CountyPhone(414) 805-3000
Source: Dmand AI Affiliation Data
Dr. Ryan Tomas Brennan is affiliated with 1 site of care and 2 medical groups
Dr. Brennan's primary practice is Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health. The medical group on file is Froedtert & the Medical College of Wisconsin Community Physicians. Dmand AI also links Dr. Brennan to 1 more medical group, named with a free account.
Froedtert & the Medical College of Wisconsin Community Physicians1 medical groupName with a free account
See all 3 affiliations for Dr. BrennanSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ryan Tomas Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Froedtert Hospital | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Ryan Tomas Brennan is one of 330 neurologists in Wisconsin
Neurology is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 2084N0400X. Dr. Brennan is board certified in neurology by the American Board of Psychiatry and Neurology. Dmand AI has Dr. Brennan's licenses on file in 2 states: Wisconsin and Nebraska.
Specialties and state licenses
- Neurology, WisconsinPrimary
- Nebraska license
Clinical focus
Dmand AI lists essential tremor, neuropathy, parkinson's disease and restless legs syndrome among the conditions Dr. Brennan treats.
Neurologists near Dr. Brennan
Counts of neurologists 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. Ryan Tomas Brennan billed Medicare for 667 services in 2024
CMS data shows 667 Medicare services from Dr. Brennan across 7 procedure codes in 2024, for 213 Medicare patients. Medicare paid $28,493 for them.
Medicare services, 2024667
Medicare patients213
Paid by Medicare$28,493
Procedure codes7
Dr. Brennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3602024: 361No change
- Other services
- 2023: 02024: 253
- Tests and treatments
- 2023: 552024: 534%
Where Dr. Brennan's Medicare services took place, 2024
- In an office24837%
- In a facility41963%
Dr. Brennan compared with the Wisconsin median for neurologists, 2024
- Dr. Brennan
- Wisconsin median
- Medicare services
- 667vs 2492.7 times
- Medicare patients
- 213vs 16430% above
- Part D claims
- 2,736vs 5564.9 times
Medians across 332 neurologists 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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ryan Tomas Brennan treated 213 Medicare patients in 2024, average age 74
CMS counts 213 Medicare patients who saw Dr. Brennan in 2024. The largest group is 65 to 74, with 106 patients. 69% of them have high cholesterol, and 69% have parkinson's disease. 9% are also on Medicaid. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Brennan's median patient age at 73, with 39% women.
Medicare patients, 2024213
Average age74
Average risk score1.37
Also on Medicaid9%
Dr. Brennan's Medicare patients by age, 2024
Dr. Brennan's Medicare patients by sex, 2024
- Women8138%
- Men13262%
Chronic conditions among Dr. Brennan's Medicare patients, 2024
- High cholesterol69%
- Parkinson's disease69%
- High blood pressure62%
- Arthritis40%
- Anxiety35%
- Mood disorders33%
- Depression31%
- Ischemic heart disease25%
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 73
Patient panel by sex, all payers
- Women39%
- Men61%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ryan Tomas Brennan wrote 2,865 Medicare Part D claims in 2024
In 2024, Dr. Brennan wrote 2,865 Medicare Part D claims for 372 patients. 81% of them were for generic drugs. CMS names the drug for 2,736 of them, across 35 drugs with 11 or more claims each, at $1,099,782 in total drug cost. In 2023, CMS named 2,456 claims across 33 drugs.
Part D claims, 20242,865
Drugs named by CMS35
Total drug cost$1.1M
Part D patients372
Dr. Brennan's Part D claims by kind of drug, 2024
- Generic2,330 claims81%
- Brand-name535 claims19%
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
- Opioids0%12 of 2,865 claims
- Antibiotics0%14 of 2,865 claims
- Antipsychotics, patients 65 and over4%115 of 2,865 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: 2,4562024: 2,73611%
Drugs named by CMS: 35 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
Dr. Ryan Tomas Brennan offers telehealth to Medicare patients
Dr. Brennan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Brennan as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ryan Tomas Brennan has 2 publications on record
Dmand AI links 2 papers to Dr. Brennan, published from 2020 to 2024. Dr. Brennan's most frequent co-authors are Sana Aslam, DO, John M. Bertoni, MD, PhD and Dominic Bryan Fee, MD.
Papers2
Years published2020 to 2024
Dr. Brennan's most frequent co-authors
- Sana Aslam, DO1 shared paper
- John M. Bertoni, MD, PhD1 shared paper
- Dominic Bryan Fee, MD1 shared paper
Recent publications by Dr. Brennan
Parkinsonism Relat Disord
DepressionDynactin ComplexHypoventilation
See who Dr. Brennan researches with
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Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Ryan Tomas Brennan received $28,243 in industry payments from 2016 to 2025
CMS Open Payments shows 145 general payments to Dr. Brennan from 11 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 44% of the total. Abbvie Inc. paid the most, $18,927.
General payments to Dr. Brennan by program year, 2016 to 2025
General payments to Dr. Brennan by kind, 2016 to 2025
$28.2Kin total
- Speaker and faculty fees$12,35044%
- Food and beverage$5,73320%
- Travel and lodging$5,55520%
- Consulting fees$4,57516%
- Education$300%
Companies that paid Dr. Brennan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ryan Tomas Brennan graduated from Michigan State University College Of Osteopathic Medicine
Dr. Brennan graduated from Michigan State University College Of Osteopathic Medicine in 2011.
- Medical school
- Board certified in neurology
- Board certified in 2015 - 2018
- Board certified in 2013 - 2025
Source: Dmand AI Professional Profile Data
Dr. Ryan Tomas Brennan accepts plans from 19 insurance carriers
Dr. Brennan is in network with 19 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
- Aetna
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Aspirus Health Plan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Humana
- +11 more carriersWith a free account
Plan types Dr. Brennan accepts, by number of carriers
- PPO11
- Medicare10
- HMO8
- POS5
- EPO4
- Medicaid2
Source: Dmand AI Insurance Network Data
Sources for Dr. Ryan Tomas 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Ryan Tomas 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. Ryan Tomas Brennan's NPI number?
Dr. Ryan Tomas Brennan's NPI number is 1649561978. It was assigned on April 20, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Ryan Tomas Brennan?
Dr. Ryan Tomas Brennan is a neurologist in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Neurology Physician (taxonomy code 2084N0400X).
Where does Dr. Ryan Tomas Brennan practice?
Dr. Brennan practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. Dr. Brennan's primary practice is Froedtert Hospital in Milwaukee, Wisconsin, part of Froedtert ThedaCare Health. Dmand AI also links Dr. Brennan to 1 medical group.
What is Dr. Ryan Tomas Brennan's office phone number?
The practice phone on file for Dr. Brennan is (414) 805-3000.
What is Dr. Ryan Tomas Brennan's medical license number?
Dr. Brennan holds Wisconsin license 60539, one of the licenses on file in 2 states.
Which states has Dr. Ryan Tomas Brennan been licensed in?
Dmand AI has state licenses on file for Dr. Brennan in Wisconsin and Nebraska.
Which hospitals is Dr. Ryan Tomas Brennan affiliated with?
Dr. Brennan practices at Froedtert Hospital in Milwaukee, Wisconsin.
What medical group is Dr. Ryan Tomas Brennan part of?
Dr. Brennan is linked to Froedtert & the Medical College of Wisconsin Community Physicians. Dmand AI links Dr. Brennan to 1 more medical group.
Does Dr. Ryan Tomas Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 667 services in 2024, and Dr. Brennan accepts Medicare assignment.
Does Dr. Ryan Tomas Brennan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Brennan as offering telehealth services.
Show 10 more questionsShow fewer questions
How many Medicare patients does Dr. Ryan Tomas Brennan see?
CMS counts 213 Medicare patients who saw Dr. Brennan in 2024, with an average age of 74.
Is Dr. Ryan Tomas Brennan board certified?
Yes. Dr. Brennan is board certified in neurology by the American Board of Psychiatry and Neurology.
What services does Dr. Ryan Tomas Brennan bill to Medicare?
In 2024, Dr. Brennan's most billed Medicare services were medicare service (G2211), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Ryan Tomas Brennan go to medical school?
Dr. Brennan graduated from Michigan State University College Of Osteopathic Medicine in 2011.
What drugs does Dr. Ryan Tomas Brennan prescribe most?
In 2024 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Carbidopa-Levodopa, Rytary and Carbidopa-Levodopa ER.
Has Dr. Ryan Tomas Brennan received payments from drug or device companies?
CMS Open Payments shows $28,243 in general payments to Dr. Brennan from 11 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Ryan Tomas Brennan been practicing?
Dr. Brennan graduated from medical school in 2011, 15 years ago.
Does Dr. Ryan Tomas Brennan do research?
Dmand AI links 2 publications to Dr. Brennan, published from 2020 to 2024.
Who does Dr. Ryan Tomas Brennan publish with?
Dr. Brennan's most frequent co-authors are Sana Aslam, DO (1 shared paper), John M. Bertoni, MD, PhD (1 shared paper) and Dominic Bryan Fee, MD (1 shared paper).
What insurance does Dr. Ryan Tomas Brennan accept?
Dr. Brennan is in network with 19 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 11. Check the plan with the practice before a visit.
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