Quick answers
- Which hospitals does Mara Horwitz work at?
- Medicare's official clinician data lists Mara Horwitz at 1 hospital: Tacoma General Allenmore Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mara Horwitz see patients?
- Medicare's clinician data lists 2 practice locations, including Auburn, WA and Kent, WA. Call before your visit to confirm the address.
- What is Mara Horwitz's specialty?
- Medicare lists Rheumatology as the primary specialty, and also Pediatric Medicine.
- Does Mara Horwitz accept Medicare assignment?
- Yes. Medicare's clinician data says Mara Horwitz 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 Mara Horwitz?
- (253) 372-7788, as listed in official Medicare / NPI Registry data.
- What is Mara Horwitz's NPI number?
- 1649613332. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mara Horwitz works
Medicare's Facility Affiliation Data lists Mara Horwitz at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Tacoma General Allenmore HospitalTacoma, WA · Acute Care Hospital · CCN 500129
Practice locations
Addresses where Mara Horwitz is enrolled with Medicare (CMS data updated 2026-10-02).
- 202 N Division StAuburn, WA 98001
- 222 State Ave NKent, WA 98030 (253) 372‑7788
Group practices
Medicare enrollment lists Mara Horwitz as a member of this group (CMS data updated 2026-10-02).
- Multicare Health System2,325 clinicians in the group
Specialties
- Rheumatologyprimary
- Pediatric Medicinealso
Other rheumatologists in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Southern Illinois University School Of Medicine |
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649613332 |
| 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