Quick answers
- Which hospitals does Olivia Demarco work at?
- Medicare's official clinician data lists Olivia Demarco at 2 hospitals: Peconic Bay Medical Center and Suny/Stony Brook University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Olivia Demarco see patients?
- Medicare's clinician data lists 2 practice locations, including Riverhead, NY. Call before your visit to confirm the address.
- What is Olivia Demarco's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Olivia Demarco accept Medicare assignment?
- Yes. Medicare's clinician data says Olivia Demarco accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Olivia Demarco?
- (631) 727-1600, as listed in official Medicare / NPI Registry data.
- What is Olivia Demarco's NPI number?
- 1962019760. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Olivia Demarco works
Medicare's Facility Affiliation Data lists Olivia Demarco at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Peconic Bay Medical CenterRiverhead, NY · Acute Care Hospital · CCN 330107
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · CCN 330393
Practice locations
Addresses where Olivia Demarco is enrolled with Medicare (CMS data updated 2026-10-02).
- 34 Commerce AveRiverhead, NY 11901 (631) 727‑1600
- 64 Commerce AveRiverhead, NY 11901 (631) 369‑5000
Group practices
Medicare enrollment lists Olivia Demarco as a member of this group (CMS data updated 2026-10-02).
- Peconic Bay Primary Medical Care71 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Riverhead
Clinicians with the same Medicare primary specialty in Riverhead, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962019760 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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