Quick answers
- Does Kristen A. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Kristen A. Obrien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Kristen A. Obrien see?
- In 2024, CMS data shows 394 Original Medicare patients and 2,535 services for Kristen A. Obrien. This counts Original Medicare only and measures volume, not quality.
- What is Kristen A. Obrien's NPI number?
- 1811922529. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Kristen A. Obrien, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 394 |
|---|---|
| Services billed to Medicare | 2,535 |
| Different services or procedures | 41 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)495 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)381 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)278 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)196 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)86 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure70%
- Arthritis43%
- Ischemic heart disease36%
- Osteoporosis27%
- Diabetes24%
Hospitals where Kristen A. Obrien works
Medicare's Facility Affiliation Data lists Kristen A. Obrien at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- John T Mather Memorial Hospital of Port JeffersonPort Jefferson, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330185
- North Shore University HospitalManhasset, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330106
- Ns/Lij HS Southside HospitalBay Shore, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330043
- St Charles HospitalPort Jefferson, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330246
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330393
Practice locations
Addresses where Kristen A. Obrien is enrolled with Medicare (CMS data updated October 2, 2026).
- 3 Technology Dr, Suite 100East Setauket, NY 11733 (631) 331‑1000
Group practices
Medicare enrollment lists Kristen A. Obrien as a member of this group (CMS data updated October 2, 2026).
- Harbor View Medical Services PC58 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in East Setauket
Clinicians with the same Medicare primary specialty in East Setauket, NY — not a recommendation.
Other clinicians in Harbor View Medical Services PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Buffalo School Of Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1811922529 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians