Quick answers
- Where does Marc T. Fields see patients?
- Medicare's clinician data lists 1 practice location in Rohnert Park, CA. Call before your visit to confirm the address.
- What is Marc T. Fields's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does Marc T. Fields accept Medicare assignment?
- Yes. Medicare's clinician data says Marc T. Fields 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 Marc T. Fields?
- (707) 584-2200, as listed in official Medicare / NPI Registry data.
- What is Marc T. Fields's NPI number?
- 1730143066. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Marc T. Fields is enrolled with Medicare (CMS data updated 2026-10-02).
- 301 Professional Ctr DrRohnert Park, CA 94928 (707) 584‑2200
Group practices
Medicare enrollment lists Marc T. Fields as a member of this group (CMS data updated 2026-10-02).
- Cancer Therapy Medical Group Inc13 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Rohnert Park
Clinicians with the same Medicare primary specialty in Rohnert Park, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Missouri, Kansas City, School Of Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1730143066 |
| 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
- 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