Quick answers
- Which hospitals does Mark Brenner work at?
- Medicare's official clinician data lists Mark Brenner at 2 hospitals: St Vincent Hospital and The Monroe Clinic. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Brenner see patients?
- Medicare's clinician data lists 2 practice locations, including Worcester, MA and Monroe, WI. Call before your visit to confirm the address.
- What is Mark Brenner's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Mark Brenner accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Brenner 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 Mark Brenner?
- (608) 324-2000, as listed in official Medicare / NPI Registry data.
- What is Mark Brenner's NPI number?
- 1902873409. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Brenner works
Medicare's Facility Affiliation Data lists Mark Brenner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Vincent HospitalWorcester, MA · Acute Care Hospital · CCN 220176
- The Monroe ClinicMonroe, WI · Acute Care Hospital · CCN 520028
Practice locations
Addresses where Mark Brenner is enrolled with Medicare (CMS data updated 2026-10-02).
- 123 Summer StWorcester, MA 01608
- 515 22nd AveMonroe, WI 53566 (608) 324‑2000
Group practices
Medicare enrollment lists Mark Brenner as a member of these groups (CMS data updated 2026-10-02).
- The Monroe Clinic, Inc.199 clinicians in the group
- Saint Vincent Physician Services Inc71 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902873409 |
| 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