Robert J. O'Brien III, PA-C
- Hospital affiliations
- 1
- Industry payments
- $23
- Medical group
- 1
- State licenses
- 2
- Year NPI issued
- 2014
- Practice address
- 535 East 70th Street, New York, NY 10021
- Practice phone
- Call (212) 606-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Robert 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.
Robert J. O'Brien III is a physician assistant in New York, New York
Robert O'Brien practices at Hospital for Special Surgery in New York, New York, part of Hospital for Special Surgery.
Robert O'Brien's NPI, 1245654797, was assigned on February 4, 2014. Robert O'Brien holds New York license 019211.
- NPI
- 1245654797NPI Registry (opens in a new tab)
- NPI enumeration date
- February 4, 2014
- NPI status
- Active
- Practice phone
- (212) 606-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Robert J. O'Brien III practices at Hospital for Special Surgery in New York, New York
Robert O'Brien's primary practice is Hospital for Special Surgery, at 535 East 70th Street, New York, NY 10021 in New York County. The practice phone is (212) 606-1000.
- Hospital for Special Surgery535 East 70th Street, New York, NY 10021 · New York CountyPhone(212) 606-1000
Source: Dmand AI Affiliation Data
Robert J. O'Brien III is affiliated with 2 sites of care and 1 medical group
Robert O'Brien's primary practice is Hospital for Special Surgery in New York, New York, part of Hospital for Special Surgery. The medical group on file is Gregory S. DiFelice, MD. Dmand AI also links Robert O'Brien to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Robert J. O'Brien III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Robert O'Brien practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hospital for Special Surgery | Available with a free account |
| +1 more affiliated site | 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 Hospital for Special Surgery and 6.2K+ hospitals, with verified contacts in the same login.
Robert J. O'Brien III is one of 11,456 physician assistants in New York
Physician assistant is Robert O'Brien's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Dmand AI has Robert O'Brien's licenses on file in 2 states: New York and New Jersey.
Specialties and state licenses
- Physician assistant, New YorkPrimary
- New Jersey license
Physician assistants near Robert 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
Robert J. O'Brien III's patients have a median age of 36
Across all payers, Dmand AI patient panel data puts Robert O'Brien's median patient age at 36, with 50% women.
Robert 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 36
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Robert J. O'Brien III received $23 in industry payments in 2025
CMS Open Payments shows 1 general payment to Robert O'Brien from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $23.
Companies that paid Robert 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 Robert J. O'Brien III'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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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 Robert J. O'Brien III
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Robert J. O'Brien III's NPI number?
Robert J. O'Brien III's NPI number is 1245654797. It was assigned on February 4, 2014, and it is active in the NPI Registry.
What does Robert J. O'Brien III specialize in?
Robert J. O'Brien III is a physician assistant in New York, New York. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does Robert J. O'Brien III practice?
Robert O'Brien practices at 535 East 70th Street, New York, NY 10021. Robert O'Brien's primary practice is Hospital for Special Surgery in New York, New York, part of Hospital for Special Surgery. Dmand AI also links Robert O'Brien to 1 group practice or clinic.
What is Robert J. O'Brien III's office phone number?
The practice phone on file for Robert O'Brien is (212) 606-1000.
What is Robert J. O'Brien III's medical license number?
Robert O'Brien holds New York license 019211, one of the licenses on file in 2 states.
Which states has Robert J. O'Brien III been licensed in?
Dmand AI has state licenses on file for Robert O'Brien in New York and New Jersey.
Which hospitals is Robert J. O'Brien III affiliated with?
Robert O'Brien practices at Hospital for Special Surgery in New York, New York.
What medical group is Robert J. O'Brien III part of?
Robert O'Brien is linked to Gregory S. DiFelice, MD.
Has Robert J. O'Brien III received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Robert O'Brien from 1 company from 2025 to 2025. The largest total came from Boston Scientific Corporation.
How long has Robert J. O'Brien III been practicing?
Robert O'Brien graduated from medical school in 2013, 13 years ago.
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