Dr. Patrick J. Brennan, MD, PhD
- Medicare services, 2024
- 307
- Medicare patients, 2024
- 79
- Part D claims, 2024
- 160
- Hospital affiliations
- 1
- Industry payments
- $84
- Practice address
- 75 Francis Street, Boston, MA 02115
- Practice phone
- Call (617) 732-5500
- 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
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. Patrick J. Brennan is an internist in Boston, Massachusetts
Dr. Brennan practices at Brigham and Women's Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Brennan's NPI, 1053458406, was assigned on February 1, 2007. Dr. Brennan graduated from Perelman School of Med at the University of Pennsylvania in 2005. Dr. Brennan holds Massachusetts license 231427.
- NPI
- 1053458406NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5799963419
- NPI enumeration date
- February 1, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 732-5500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Patrick J. Brennan practices at Brigham and Women's Hospital in Boston, Massachusetts
Dr. Brennan's primary practice is Brigham and Women's Hospital, at 75 Francis Street, Boston, MA 02115 in Suffolk County. The practice phone is (617) 732-5500.
- Brigham and Women's Hospital75 Francis Street, Boston, MA 02115 · Suffolk CountyPhone(617) 732-5500
Source: Dmand AI Affiliation Data
Dr. Patrick J. Brennan is affiliated with 2 sites of care and 1 medical group
Dr. Brennan's primary practice is Brigham and Women's Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Brigham and Women's Hospital. Dmand AI also links Dr. Brennan to 1 more hospital outpatient department, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Patrick J. Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Brigham and Women's Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Patrick J. Brennan is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Brennan is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Brennan
Counts of internists 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. Patrick J. Brennan billed Medicare for 307 services in 2024
CMS data shows 307 Medicare services from Dr. Brennan across 4 procedure codes in 2024, for 79 Medicare patients. Medicare paid $9,357 for them. Every service was in an office.
Dr. Brennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 02024: 217
- Office and hospital visits
- 2023: 202024: 90350%
Dr. Brennan compared with the Massachusetts median for internists, 2024
- Dr. Brennan
- Massachusetts median
- Medicare services
- 307vs 43129% below
- Medicare patients
- 79vs 19459% below
- Part D claims
- 94vs 40277% below
Medians across 5,369 internists in Massachusetts 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. Patrick J. Brennan treated 79 Medicare patients in 2024, average age 72
CMS counts 79 Medicare patients who saw Dr. Brennan in 2024. The largest group is 65 to 74, with 46 patients. 70% of them have high cholesterol, and 66% have high blood pressure. Their average risk score is 0.90, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Brennan's median patient age at 57, with 69% women.
Dr. Brennan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Brennan's Medicare patients by sex, 2024
- Women5671%
- Men2329%
Chronic conditions among Dr. Brennan's Medicare patients, 2024
- High cholesterol70%
- High blood pressure66%
- Arthritis46%
- Anxiety32%
- Mood disorders29%
- Asthma25%
- Depression25%
- Osteoporosis23%
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 57
Patient panel by sex, all payers
- Women69%
- Men31%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Patrick J. Brennan wrote 160 Medicare Part D claims in 2024
In 2024, Dr. Brennan wrote 160 Medicare Part D claims for 50 patients. 63% of them were for generic drugs. CMS names the drug for 94 of them, across 4 drugs with 11 or more claims each, at $15,276 in total drug cost. In 2023, CMS named 51 claims across 3 drugs.
Dr. Brennan's Part D claims by kind of drug, 2024
- Generic101 claims63%
- Brand-name59 claims37%
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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 512024: 9484%
Drugs named by CMS: 4 in 2024, 3 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. Patrick J. 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. Patrick J. Brennan received $84 in industry payments from 2017 to 2018
CMS Open Payments shows 5 general payments to Dr. Brennan from 3 drug and device companies from 2017 to 2018. Food and beverage make up the largest share, 100% of the total. Shire North American Group Inc paid the most, $55.
General payments to Dr. Brennan by program year, 2017 to 2018
Companies that paid Dr. Brennan the most, 2017 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Patrick J. Brennan graduated from Perelman School of Med at the University of Pennsylvania
Dr. Brennan graduated from Perelman School of Med at the University of Pennsylvania in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Patrick J. 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Patrick J. 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. Patrick J. Brennan's NPI number?
Dr. Patrick J. Brennan's NPI number is 1053458406. It was assigned on February 1, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Patrick J. Brennan?
Dr. Patrick J. Brennan is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Patrick J. Brennan practice?
Dr. Brennan practices at 75 Francis Street, Boston, MA 02115. Dr. Brennan's primary practice is Brigham and Women's Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Brennan to 1 hospital outpatient department.
What is Dr. Patrick J. Brennan's office phone number?
The practice phone on file for Dr. Brennan is (617) 732-5500.
What is Dr. Patrick J. Brennan's medical license number?
Dr. Brennan holds Massachusetts license 231427.
Which hospitals is Dr. Patrick J. Brennan affiliated with?
Dr. Brennan practices at Brigham and Women's Hospital in Boston, Massachusetts.
What medical group is Dr. Patrick J. Brennan part of?
Dr. Brennan is linked to Brigham and Women's Hospital.
Does Dr. Patrick J. Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 307 services in 2024, and Dr. Brennan accepts Medicare assignment.
Does Dr. Patrick J. Brennan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Brennan as offering telehealth services.
How many Medicare patients does Dr. Patrick J. Brennan see?
CMS counts 79 Medicare patients who saw Dr. Brennan in 2024, with an average age of 72.
Show 5 more questionsShow fewer questions
What services does Dr. Patrick J. Brennan bill to Medicare?
In 2024, Dr. Brennan's most billed Medicare services were allergy test or treatment (95004), office visit, new patient (99204) and office visit, established patient (99214).
Where did Dr. Patrick J. Brennan go to medical school?
Dr. Brennan graduated from Perelman School of Med at the University of Pennsylvania in 2005.
What drugs does Dr. Patrick J. Brennan prescribe most?
In 2024 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Ipratropium Bromide, Azelastine HCl and Epinephrine.
Has Dr. Patrick J. Brennan received payments from drug or device companies?
CMS Open Payments shows $84 in general payments to Dr. Brennan from 3 companies from 2017 to 2018. The largest total came from Shire North American Group Inc.
How long has Dr. Patrick J. Brennan been practicing?
Dr. Brennan graduated from medical school in 2005, 21 years ago.
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