Jillian Anne O'Brien, PA
- Medicare patients, 2024
- 15
- Part D claims, 2024
- 34
- Hospital affiliations
- 1
- Industry payments
- $94
- Medical groups
- 2
- Practice address
- Health Sciences Center Suny, Stony Brook, NY 11794
- Practice phone
- Call (631) 444-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Jillian O'Brien'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.
Jillian Anne O'Brien is a physician assistant in Stony Brook, New York
Jillian O'Brien practices at Stony Brook University Hospital in Stony Brook, New York, part of Stony Brook University.
Jillian O'Brien's NPI, 1558626614, was assigned on July 5, 2012. Jillian O'Brien holds New York license 015675.
- NPI
- 1558626614NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5799932463
- NPI enumeration date
- July 5, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (631) 444-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Jillian Anne O'Brien practices at 2 locations in Stony Brook, New York
Jillian O'Brien's primary practice is Stony Brook University Hospital, at Health Sciences Center Suny, Stony Brook, NY 11794 in Suffolk County. The practice phone is (631) 444-4000. Jillian O'Brien also practices at Stony Brook University Hospital, 101 Nicolls Rd, Stony Brook, NY 11794.
- Stony Brook University HospitalPrimaryHealth Sciences Center Suny, Stony Brook, NY 11794 · Suffolk CountyPhone(631) 444-4000
- Stony Brook University Hospital101 Nicolls Rd, Stony Brook, NY 11794 · Suffolk CountyPhone(631) 444-4100
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Jillian Anne O'Brien is affiliated with 4 sites of care and 2 medical groups
Jillian O'Brien's primary practice is Stony Brook University Hospital in Stony Brook, New York, part of Stony Brook University. The medical group on file is Northwell Health Physician Partners Cardiology at Great Neck. Dmand AI also links Jillian O'Brien to 2 more group practices and clinics, 1 clinical lab and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Jillian Anne O'Brien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Jillian O'Brien practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Stony Brook University Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Stony Brook University and 6.2K+ hospitals, with verified contacts in the same login.
Jillian Anne O'Brien is one of 11,456 physician assistants in New York
Physician assistant is Jillian O'Brien's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Jillian O'Brien is licensed in New York.
Specialties and state licenses
- Physician assistant, New YorkPrimary
Physician assistants near Jillian O'Brien
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
Jillian Anne O'Brien treated 15 Medicare patients in 2024, average age 71
CMS counts 15 Medicare patients who saw Jillian O'Brien in 2024. 75% of them have arthritis, and 75% have high cholesterol. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Jillian O'Brien's median patient age at 63, with 52% women.
Chronic conditions among Jillian O'Brien's Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure73%
Share of Medicare patients with each condition. A patient can have several.
Jillian O'Brien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women52%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Jillian Anne O'Brien wrote 34 Medicare Part D claims in 2024
In 2024, Jillian O'Brien wrote 34 Medicare Part D claims for 21 patients. 100% of them were for generic drugs.
Drug classes CMS tracks in Jillian O'Brien's Part D claims, 2024
- Opioids35%12 of 34 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Jillian Anne O'Brien takes part in Medicare
Jillian O'Brien 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)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Jillian Anne O'Brien received $94 in industry payments in 2025
CMS Open Payments shows 3 general payments to Jillian O'Brien from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Ferring Pharmaceuticals Inc. paid the most, $94.
Companies that paid Jillian O'Brien the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Jillian Anne O'Brien'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 Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 Jillian Anne O'Brien
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Jillian Anne O'Brien's NPI number?
Jillian Anne O'Brien's NPI number is 1558626614. It was assigned on July 5, 2012, and it is active in the NPI Registry.
What does Jillian Anne O'Brien specialize in?
Jillian Anne O'Brien is a physician assistant in Stony Brook, New York. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Jillian Anne O'Brien practice?
Jillian O'Brien practices at Health Sciences Center Suny, Stony Brook, NY 11794. Jillian O'Brien also practices at 101 Nicolls Rd, Stony Brook, NY 11794. Jillian O'Brien's primary practice is Stony Brook University Hospital in Stony Brook, New York, part of Stony Brook University. Dmand AI also links Jillian O'Brien to 2 group practices and clinics, 1 clinical lab and 1 medical group.
What is Jillian Anne O'Brien's office phone number?
The practice phone on file for Jillian O'Brien is (631) 444-4000.
What is Jillian Anne O'Brien's medical license number?
Jillian O'Brien holds New York license 015675.
Which hospitals is Jillian Anne O'Brien affiliated with?
Jillian O'Brien practices at Stony Brook University Hospital in Stony Brook, New York.
What medical group is Jillian Anne O'Brien part of?
Jillian O'Brien is linked to Northwell Health Physician Partners Cardiology at Great Neck. Dmand AI links Jillian O'Brien to 1 more medical group.
Does Jillian Anne O'Brien accept Medicare?
Yes. CMS lists Jillian O'Brien as accepting Medicare assignment.
How many Medicare patients does Jillian Anne O'Brien see?
CMS counts 15 Medicare patients who saw Jillian O'Brien in 2024, with an average age of 71.
Has Jillian Anne O'Brien received payments from drug or device companies?
CMS Open Payments shows $94 in general payments to Jillian O'Brien from 1 company from 2025 to 2025. The largest total came from Ferring Pharmaceuticals Inc.
How long has Jillian Anne O'Brien been practicing?
Jillian O'Brien graduated from medical school in 2012, 14 years ago.
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