Quick answers
- Which hospitals does Marek M. Kowalski work at?
- Medicare's official clinician data lists Marek M. Kowalski at 2 hospitals: Ronald Reagan UCLA Medical Center and Santa Monica - UCLA Medical Center & Orthopaedic Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marek M. Kowalski see patients?
- Medicare's clinician data lists 1 practice location in Los Angeles, CA. Call before your visit to confirm the address.
- What is Marek M. Kowalski's specialty?
- Medicare lists Hospitalist as the primary specialty, and also Internal Medicine.
- Does Marek M. Kowalski accept Medicare assignment?
- Medicare's clinician data says Marek M. Kowalski may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Marek M. Kowalski's NPI number?
- 1720665409. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marek M. Kowalski works
Medicare's Facility Affiliation Data lists Marek M. Kowalski at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050262
- Santa Monica - UCLA Medical Center & Orthopaedic HospitalSanta Monica, CA · Acute Care Hospital · CCN 050112
Practice locations
Addresses where Marek M. Kowalski is enrolled with Medicare (CMS data updated 2026-10-02).
- 5767 W Century Blvd, Suite 400Los Angeles, CA 90045
Specialties
- Hospitalistprimary
- Internal Medicinealso
Other hospitalists in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Clinician information
| Medical school | Boston University School Of Medicine |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1720665409 |
| 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