Quick answers
- Which hospitals does Marissa C. Maas work at?
- Medicare's official clinician data lists Marissa C. Maas at 4 hospitals: Lac/Rancho Los Amigos National Rehabilitation Center, Los Angeles General Medical Center, Temple Health - Chestnut Hill Hospital and Temple University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marissa C. Maas see patients?
- Medicare's clinician data lists 2 practice locations, including Philadelphia, PA. Call before your visit to confirm the address.
- What is Marissa C. Maas's specialty?
- Medicare lists Urology as the primary specialty.
- Does Marissa C. Maas accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa C. Maas 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 Marissa C. Maas?
- (215) 707-2111, as listed in official Medicare / NPI Registry data.
- What is Marissa C. Maas's NPI number?
- 1023644671. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marissa C. Maas works
Medicare's Facility Affiliation Data lists Marissa C. Maas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lac/Rancho Los Amigos National Rehabilitation CenterDowney, CA · Acute Care Hospital · CCN 050717
- Los Angeles General Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050373
- Temple Health - Chestnut Hill HospitalPhiladelphia, PA · Acute Care Hospital · CCN 390026
- Temple University HospitalPhiladelphia, PA · Acute Care Hospital · CCN 390027
Practice locations
Addresses where Marissa C. Maas is enrolled with Medicare (CMS data updated 2026-10-02).
- 333 Cottman AvePhiladelphia, PA 19111 (215) 707‑2111
- 3509 N Broad StPhiladelphia, PA 19140 (215) 707‑2111
Group practices
Medicare enrollment lists Marissa C. Maas as a member of this group (CMS data updated 2026-10-02).
- Temple Faculty Practice Plan Inc1,368 clinicians in the group
Specialties
- Urologyprimary
Other urologists in Philadelphia
Clinicians with the same Medicare primary specialty in Philadelphia, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Southern California Keck School Of Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023644671 |
| 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