Quick answers
- Which hospitals does Mariusz Olesiak work at?
- Medicare's official clinician data lists Mariusz Olesiak at 1 hospital: Boston Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mariusz Olesiak see patients?
- Medicare's clinician data lists 4 practice locations, including Boston, MA. Call before your visit to confirm the address.
- What is Mariusz Olesiak's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Mariusz Olesiak accept Medicare assignment?
- Yes. Medicare's clinician data says Mariusz Olesiak 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 Mariusz Olesiak?
- (617) 638-8605, as listed in official Medicare / NPI Registry data.
- What is Mariusz Olesiak's NPI number?
- 1417204496. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mariusz Olesiak works
Medicare's Facility Affiliation Data lists Mariusz Olesiak at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Boston Medical CenterBoston, MA · Acute Care Hospital · CCN 220031
Practice locations
Addresses where Mariusz Olesiak is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Boston Medical Ctr PlBoston, MA 02118 (617) 638‑8605
- 1 Boston Medical Ctr Pl, C500Boston, MA 02118 (617) 638‑8609
- 732 Harrison AveBoston, MA 02118
- 732 Harrison Ave Fl 3, Preston BldgBoston, MA 02118 (617) 638‑7350
Group practices
Medicare enrollment lists Mariusz Olesiak as a member of this group (CMS data updated 2026-10-02).
- Boston University General Surgical Associates, Inc.84 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Graduation year | 2011 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417204496 |
| 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