Am J Emerg Med
Academic Medical CentersClinical CompetenceEducational Measurement
Dr. John P. Brennan, MD
NPI1851339071PAC ID3577637487
- Medicare services, 2024
- 1,721
- Medicare patients, 2024
- 658
- Part D claims, 2024
- 3,337
- Publications
- 2
- Hospital affiliations
- 4
- Practice address
- 3 Alumni Dr, Exeter, NH 03833
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Core Physicians - HOPD
Acute Care Hospital outpatient department · Exeter, New Hampshire
Find Dr. Brennan's professional email, personal email and mobile number
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Dr. John P. Brennan is a pulmonologist in Exeter, New Hampshire
Dr. Brennan practices at Core Physicians - HOPD in Exeter, New Hampshire.
Dr. Brennan's NPI, 1851339071, was assigned on June 2, 2006. Dr. Brennan graduated from Tufts University School of Medicine in 2002. Dr. Brennan holds New Hampshire license 13816.
NPI and contact details
- NPI
- 1851339071NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3577637487
- NPI enumeration date
- June 2, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John P. Brennan practices at Core Physicians - HOPD in Exeter, New Hampshire
Dr. Brennan's primary practice is Core Physicians - HOPD, at 3 Alumni Dr, Exeter, NH 03833.
- Core Physicians - HOPD3 Alumni Dr, Exeter, NH 03833
Source: Dmand AI Affiliation Data
Dr. John P. Brennan is affiliated with 8 sites of care and 2 medical groups
Dr. Brennan's primary practice is Core Physicians - HOPD in Exeter, New Hampshire. Dr. Brennan is also affiliated with Exeter Hospital. The medical group on file is Core Physicians. Dmand AI also links Dr. Brennan to 3 more hospitals, 2 group practices and clinics, 1 hospice and 1 medical group, each named with a free account. Dr. Brennan's employer is on file too: a hospital.
Core Physicians - HOPDPrimary
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John P. Brennan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Brennan practices, 8 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Core Physicians - HOPD | Available with a free account |
| +7 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John P. Brennan is one of 74 pulmonologists in New Hampshire
Pulmonary disease is Dr. Brennan's primary specialty in the NPI Registry, under taxonomy code 207RP1001X. Dr. Brennan is licensed in New Hampshire.
Specialties and state licenses
- Pulmonary disease, New HampshirePrimary
Pulmonologists near Dr. Brennan
Counts of pulmonologists with a Dmand AI profile, by place and practice. Each opens the list.
74pulmonologists in New Hampshire
5pulmonologists in Exeter
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. John P. Brennan billed Medicare for 1,721 services in 2024
CMS data shows 1,721 Medicare services from Dr. Brennan across 17 procedure codes in 2024, for 658 Medicare patients. Medicare paid $109,811 for them.
Medicare services, 20241,721
Medicare patients658
Paid by Medicare$109,811
Procedure codes17
Dr. Brennan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,0292024: 9448%
- Tests and treatments
- 2023: 1982024: 658232%
- Surgery
- 2023: 1482024: 10628%
- Lab and pathology
- 2023: 182024: 1328%
- Other services
- 2023: 112024: 0100%
Where Dr. Brennan's Medicare services took place, 2024
- In an office97357%
- In a facility74843%
Dr. Brennan compared with the New Hampshire median for pulmonologists, 2024
- Dr. Brennan
- New Hampshire median
- Medicare services
- 1,721vs 5862.9 times
- Medicare patients
- 658vs 34094% above
- Part D claims
- 3,199vs 7824.1 times
Medians across 76 pulmonologists in New Hampshire 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 pulmonologists in New Hampshire.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John P. Brennan treated 658 Medicare patients in 2024, average age 75
CMS counts 658 Medicare patients who saw Dr. Brennan in 2024. The largest group is 75 to 84, with 270 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 8% are also on Medicaid. Their average risk score is 1.55, 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 73, with 56% women.
Medicare patients, 2024658
Average age75
Average risk score1.55
Also on Medicaid8%
Dr. Brennan's Medicare patients by age, 2024
Dr. Brennan's Medicare patients by sex, 2024
- Women40762%
- Men25138%
Chronic conditions among Dr. Brennan's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- COPD57%
- Arthritis51%
- Ischemic heart disease35%
- Anxiety33%
- Mood disorders27%
- Atrial fibrillation25%
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
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John P. Brennan wrote 3,337 Medicare Part D claims in 2024
In 2024, Dr. Brennan wrote 3,337 Medicare Part D claims for 513 patients. 45% of them were for generic drugs. CMS names the drug for 3,199 of them, across 30 drugs with 11 or more claims each, at $1,150,663 in total drug cost. In 2023, CMS named 2,264 claims across 29 drugs.
Part D claims, 20243,337
Drugs named by CMS30
Total drug cost$1.2M
Part D patients513
Dr. Brennan's Part D claims by kind of drug, 2024
- Generic1,516 claims45%
- Brand-name1,821 claims55%
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
- Antibiotics18%590 of 3,337 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: 2,2642024: 3,19941%
Drugs named by CMS: 30 in 2024, 29 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 P. 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. John P. Brennan has 2 publications on record
Dmand AI links 2 papers to Dr. Brennan, published from 2015 to 2017. The most frequent topics are Emergency Service, Hospital. Dr. Brennan's most frequent co-authors are Stephen C. Dorner, MD and Anand M. Prabhakar, MD.
Papers2
Years published2015 to 2017
Topics Dr. Brennan writes about most
- Emergency Service, Hospital
Dr. Brennan's most frequent co-authors
Recent publications by Dr. Brennan
Emergency Service, HospitalFinancial Management, HospitalTime and Motion Studies
See who Dr. Brennan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Brennan works with, so you can find a warm path to the right pulmonologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. John P. Brennan received $275 in industry payments from 2016 to 2025
CMS Open Payments shows 10 general payments to Dr. Brennan from 7 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 96% of the total. Merck Sharp & Dohme Corporation paid the most, $93.
General payments to Dr. Brennan by program year, 2016 to 2025
General payments to Dr. Brennan by kind, 2016 to 2025
$275in total
- Food and beverage$26396%
- Education$124%
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. John P. Brennan graduated from Tufts University School of Medicine
Dr. Brennan graduated from Tufts University School of Medicine in 2002.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John P. 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 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 |
| 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 P. 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 P. Brennan's NPI number?
Dr. John P. Brennan's NPI number is 1851339071. It was assigned on June 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John P. Brennan?
Dr. John P. Brennan is a pulmonologist in Exeter, New Hampshire. The primary specialty in the NPI Registry is Pulmonary Disease Physician (taxonomy code 207RP1001X).
Where does Dr. John P. Brennan practice?
Dr. Brennan practices at 3 Alumni Dr, Exeter, NH 03833. Dr. Brennan's primary practice is Core Physicians - HOPD in Exeter, New Hampshire. Dmand AI also links Dr. Brennan to 3 hospitals, 2 group practices and clinics, 1 hospice and 1 medical group.
What is Dr. John P. Brennan's medical license number?
Dr. Brennan holds New Hampshire license 13816.
Which hospitals is Dr. John P. Brennan affiliated with?
Dr. Brennan is affiliated with Exeter Hospital. Dmand AI links Dr. Brennan to 3 more hospitals.
What medical group is Dr. John P. Brennan part of?
Dr. Brennan is linked to Core Physicians. Dmand AI links Dr. Brennan to 1 more medical group.
Does Dr. John P. Brennan accept Medicare?
Yes. CMS data shows Dr. Brennan billed Medicare for 1,721 services in 2024, and Dr. Brennan accepts Medicare assignment.
Does Dr. John P. Brennan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Brennan as offering telehealth services.
How many Medicare patients does Dr. John P. Brennan see?
CMS counts 658 Medicare patients who saw Dr. Brennan in 2024, with an average age of 75.
What services does Dr. John P. Brennan bill to Medicare?
In 2024, Dr. Brennan's most billed Medicare services were office visit, established patient (99214), lung function service (94060) and lung function service (94729).
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Where did Dr. John P. Brennan go to medical school?
Dr. Brennan graduated from Tufts University School of Medicine in 2002.
What drugs does Dr. John P. Brennan prescribe most?
In 2024 Medicare Part D data, Dr. Brennan's most prescribed drugs by claims were Trelegy Ellipta, Albuterol Sulfate Hfa and Azithromycin.
Has Dr. John P. Brennan received payments from drug or device companies?
CMS Open Payments shows $275 in general payments to Dr. Brennan from 7 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. John P. Brennan been practicing?
Dr. Brennan graduated from medical school in 2002, 24 years ago.
Does Dr. John P. Brennan do research?
Dmand AI links 2 publications to Dr. Brennan, published from 2015 to 2017.
Who does Dr. John P. Brennan publish with?
Dr. Brennan's most frequent co-authors are Stephen C. Dorner, MD (1 shared paper) and Anand M. Prabhakar, MD (1 shared paper).
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