Dennis K. Duffy, PA
- Medicare patients, 2024
- 19
- Part D claims, 2024
- 21
- Hospital affiliations
- 1
- Medical groups
- 2
- State license
- 1
- Practice address
- 201 Manor Pl, Greenport, NY 11944
- Practice phone
- Call (631) 477-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Eastern Long Island Hospital
Greenport, New York
Find Dennis Duffy'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.
Dennis K. Duffy is a physician assistant in Greenport, New York
Dennis Duffy practices at Eastern Long Island Hospital in Greenport, New York.
Dennis Duffy's NPI, 1932136447, was assigned on June 28, 2006. Dennis Duffy graduated from State University of New York at Stony Brook, School of Medicine in 1992. Dennis Duffy holds New York license 004529.
- NPI
- 1932136447NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2860480720
- NPI enumeration date
- June 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (631) 477-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dennis K. Duffy practices at Eastern Long Island Hospital in Greenport, New York
Dennis Duffy's primary practice is Eastern Long Island Hospital, at 201 Manor Pl, Greenport, NY 11944 in Suffolk County. The practice phone is (631) 477-1000.
- Eastern Long Island Hospital201 Manor Pl, Greenport, NY 11944 · Suffolk CountyPhone(631) 477-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dennis K. Duffy is affiliated with 4 sites of care and 2 medical groups
Dennis Duffy's primary practice is Eastern Long Island Hospital in Greenport, New York. Dennis Duffy is also affiliated with Stony Brook University Hospital. The medical group on file is Northwell Health Physician Partners Cardiology at Great Neck. Dmand AI also links Dennis Duffy to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dennis K. Duffy's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dennis Duffy practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Eastern Long Island Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dennis K. Duffy is one of 11,456 physician assistants in New York
Physician assistant is Dennis Duffy's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Dennis Duffy is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA). Dennis Duffy is licensed in New York.
Specialties and state licenses
- Physician assistant, New YorkPrimary
Physician assistants near Dennis Duffy
Counts of physician assistants 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
Dennis K. Duffy treated 19 Medicare patients in 2024, average age 79
CMS counts 19 Medicare patients who saw Dennis Duffy in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 2.30, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dennis Duffy's median patient age at 64, with 0% women.
Chronic conditions among Dennis Duffy's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis68%
- Ischemic heart disease58%
- Mood disorders58%
- Stroke or TIA58%
Share of Medicare patients with each condition. A patient can have several.
Dennis Duffy's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women0%
- Men100%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dennis K. Duffy wrote 21 Medicare Part D claims in 2024
In 2024, Dennis Duffy wrote 21 Medicare Part D claims for 13 patients. 90% of them were for generic drugs.
Dennis Duffy's Part D claims by kind of drug, 2024
- Generic19 claims90%
- Brand-name and other2 claims10%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dennis K. Duffy takes part in Medicare
Dennis Duffy accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dennis K. Duffy graduated from State University of New York at Stony Brook, School of Medicine
Dennis Duffy graduated from State University of New York at Stony Brook, School of Medicine in 1992. Dennis Duffy is a member of AAPA, NCCPA and Neurocritical Care Society.
- Medical school
- Board certified in certified physician assistant
Source: Dmand AI Professional Profile Data
Sources for Dennis K. Duffy'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 Data |
| 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 (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) |
| 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 Dennis K. Duffy
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dennis K. Duffy's NPI number?
Dennis K. Duffy's NPI number is 1932136447. It was assigned on June 28, 2006, and it is active in the NPI Registry.
What does Dennis K. Duffy specialize in?
Dennis K. Duffy is a physician assistant in Greenport, New York. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Dennis K. Duffy practice?
Dennis Duffy practices at 201 Manor Pl, Greenport, NY 11944. Dennis Duffy's primary practice is Eastern Long Island Hospital in Greenport, New York. Dmand AI also links Dennis Duffy to 2 group practices and clinics and 1 medical group.
What is Dennis K. Duffy's office phone number?
The practice phone on file for Dennis Duffy is (631) 477-1000.
What is Dennis K. Duffy's medical license number?
Dennis Duffy holds New York license 004529.
Which hospitals is Dennis K. Duffy affiliated with?
Dennis Duffy is affiliated with Stony Brook University Hospital.
What medical group is Dennis K. Duffy part of?
Dennis Duffy is linked to Northwell Health Physician Partners Cardiology at Great Neck. Dmand AI links Dennis Duffy to 1 more medical group.
Does Dennis K. Duffy accept Medicare?
Yes. CMS lists Dennis Duffy as accepting Medicare assignment.
How many Medicare patients does Dennis K. Duffy see?
CMS counts 19 Medicare patients who saw Dennis Duffy in 2024, with an average age of 79.
Is Dennis K. Duffy board certified?
Yes. Dennis Duffy is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA).
Where did Dennis K. Duffy go to medical school?
Dennis Duffy graduated from State University of New York at Stony Brook, School of Medicine in 1992.
How long has Dennis K. Duffy been practicing?
Dennis Duffy graduated from medical school in 1992, 34 years ago.
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