Quick answers
- Does Courtney O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Courtney O'Brien 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 Courtney O'Brien see?
- In 2024, CMS data shows 24 Original Medicare patients and 210 services for Courtney O'Brien. This counts Original Medicare only and measures volume, not quality.
- What is Courtney O'Brien's NPI number?
- 1821372442. 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 Courtney O'Brien, 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 | 24 |
|---|---|
| Services billed to Medicare | 210 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Psychotherapy, 1 hour (90837)148 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%
- Anxiety75%
- Depression63%
- High blood pressure58%
- Arthritis54%
Practice locations
Addresses where Courtney O'Brien is enrolled with Medicare (CMS data updated October 2, 2026).
- 169 Putnam Hall, South CampusStony Brook, NY 11794 (631) 632‑8850
Group practices
Medicare enrollment lists Courtney O'Brien as a member of this group (CMS data updated October 2, 2026).
- Stony Brook Psychiatric Associates University Faculty Practice Corpor104 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Stony Brook
Clinicians with the same Medicare primary specialty in Stony Brook, NY — not a recommendation.
Other clinicians in Stony Brook Psychiatric Associates University Faculty Practice Corpor
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2011 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1821372442 |
| 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
- 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