Quick answers
- Which hospitals does Mason Marshall work at?
- Medicare's official clinician data lists Mason Marshall at 5 hospitals: Fort Memorial Hospital, Sauk Prairie Hospital, Southwest Health Center, SSM Health St Mary's Hospital - Janesville and SSM Health St Mary's Hospital - Madison. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mason Marshall see patients?
- Medicare's clinician data lists 1 practice location in Madison, WI. Call before your visit to confirm the address.
- What is Mason Marshall's specialty?
- Medicare lists Pathology as the primary specialty.
- Does Mason Marshall accept Medicare assignment?
- Yes. Medicare's clinician data says Mason Marshall 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 Mason Marshall?
- (608) 251-6100, as listed in official Medicare / NPI Registry data.
- What is Mason Marshall's NPI number?
- 1609401736. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mason Marshall works
Medicare's Facility Affiliation Data lists Mason Marshall at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Fort Memorial HospitalFort Atkinson, WI · Acute Care Hospital · CCN 520071
- Sauk Prairie HospitalPrairie Du Sac, WI · Acute Care Hospital · CCN 520095
- Southwest Health CenterPlatteville, WI · Critical Access Hospital · CCN 521354
- SSM Health St Mary's Hospital - JanesvilleJanesville, WI · Acute Care Hospital · CCN 520208
- SSM Health St Mary's Hospital - MadisonMadison, WI · Acute Care Hospital · CCN 520083
Practice locations
Addresses where Mason Marshall is enrolled with Medicare (CMS data updated 2026-10-02).
- 700 S Park StMadison, WI 53715 (608) 251‑6100
Group practices
Medicare enrollment lists Mason Marshall as a member of this group (CMS data updated 2026-10-02).
- Associated Pathologists, SC19 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Madison
Clinicians with the same Medicare primary specialty in Madison, WI — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609401736 |
| 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