Quick answers
- Which hospitals does Mary E. Zahnle work at?
- Medicare's official clinician data lists Mary E. Zahnle at 1 hospital: MercyOne North Iowa Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary E. Zahnle see patients?
- Medicare's clinician data lists 2 practice locations, including Fort Worth, TX and Los Angeles, CA. Call before your visit to confirm the address.
- What is Mary E. Zahnle's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Mary E. Zahnle accept Medicare assignment?
- Medicare's clinician data says Mary E. Zahnle may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Mary E. Zahnle's NPI number?
- 1598517716. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary E. Zahnle works
Medicare's Facility Affiliation Data lists Mary E. Zahnle at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- MercyOne North Iowa Medical CenterMason City, IA · Acute Care Hospital · CCN 160064
Practice locations
Addresses where Mary E. Zahnle is enrolled with Medicare (CMS data updated 2026-10-02).
- 4100 International PlzFort Worth, TX 76109
- PO BoxLos Angeles, CA 90074
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Fort Worth
Clinicians with the same Medicare primary specialty in Fort Worth, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2024 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1598517716 |
| 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