CredentialingRadiotherapy, Intensity-ModulatedRadiotherapy Planning, Computer-Assisted
Dr. Marc T. Fields, MD
NPI1730143066PAC ID0941226138
- Medicare services, 2023
- 12
- Part D claims, 2024
- 160
- Publications
- 3
- Industry payments
- $135
- Affiliated sites
- 2
- Practice address
- 301 Professional Center Dr, Rohnert Park, CA 94928
- Practice phone
- Call (707) 584-2200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Rohnert Park Cancer Center
Rohnert Park, California
Find Dr. Fields' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marc T. Fields is a radiation oncologist in Rohnert Park, California
Dr. Fields practices at Rohnert Park Cancer Center in Rohnert Park, California.
Dr. Fields' NPI, 1730143066, was assigned on April 13, 2006. Dr. Fields graduated from UMKC School of Medicine in 1994. Dr. Fields' California license number on file is C52087.
NPI and contact details
- NPI
- 1730143066NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0941226138
- NPI enumeration date
- April 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 584-2200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marc T. Fields practices at Rohnert Park Cancer Center in Rohnert Park, California
Dr. Fields' primary practice is Rohnert Park Cancer Center, at 301 Professional Center Dr, Rohnert Park, CA 94928 in Sonoma County. The practice phone is (707) 584-2200.
- Rohnert Park Cancer Center301 Professional Center Dr, Rohnert Park, CA 94928 · Sonoma CountyPhone(707) 584-2200
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Marc T. Fields is affiliated with 3 sites of care and 2 medical groups
Dr. Fields' primary practice is Rohnert Park Cancer Center in Rohnert Park, California. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Fields to 2 more group practices and clinics and 1 medical group, each named with a free account.
Rohnert Park Cancer CenterPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marc T. Fields' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fields practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Rohnert Park Cancer Center | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marc T. Fields is one of 685 radiation oncologists in California
Radiation oncology is Dr. Fields' primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Fields is board certified in radiation oncology by the American Board of Radiology. Dmand AI has Dr. Fields' licenses on file in 3 states: California, Arizona and Michigan.
Specialties and state licenses
- Radiation oncology, CaliforniaPrimary
- Arizona license
- Michigan license
Radiation oncologists near Dr. Fields
Counts of radiation oncologists with a Dmand AI profile, by place and practice. Each opens the list.
685radiation oncologists in California
4radiation oncologists in Rohnert Park
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marc T. Fields billed Medicare for 12 services in 2023
CMS data shows 12 Medicare services from Dr. Fields across 1 procedure code in 2023. Medicare paid $3,053 for them. Every service was in an office.
Medicare services, 202312
Paid by Medicare$3,053
Procedure codes1
Dr. Fields' Medicare services by type, 2022 to 2023
- 2022
- 2023
- Imaging
- 2022: 172023: 1229%
Dr. Fields compared with the California median for radiation oncologists, 2023
- Dr. Fields
- California median
- Medicare services
- 12vs 1,44499% below
- Part D claims
- 66vs 322.1 times
Medians across 633 radiation oncologists in California with Dmand AI profiles that report each measure.
Dr. Fields' most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Fields?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Fields and other radiation oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marc T. Fields' patients have a median age of 72
Across all payers, Dmand AI patient panel data puts Dr. Fields' median patient age at 72, with 48% women.
Dr. Fields' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women48%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Marc T. Fields wrote 160 Medicare Part D claims in 2024
In 2024, Dr. Fields wrote 160 Medicare Part D claims for 57 patients. 89% of them were for generic drugs. CMS names the drug for 66 of them, across 3 drugs with 11 or more claims each, at $2,881 in total drug cost. In 2023, CMS named 19 claims across 1 drug.
Part D claims, 2024160
Drugs named by CMS3
Total drug cost$2,881
Part D patients57
Dr. Fields' Part D claims by kind of drug, 2024
- Generic142 claims89%
- Brand-name and other18 claims11%
Dr. Fields' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Fields' Part D claims, 2024
- Opioids13%21 of 160 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 192024: 66247%
Drugs named by CMS: 3 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Marc T. Fields takes part in Medicare
Dr. Fields accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marc T. Fields has 3 publications on record
Dmand AI links 3 papers to Dr. Fields in 2019. The most frequent topics are Radiotherapy Planning, Computer-Assisted. Dr. Fields' most frequent co-authors are Douglas W. Arthur, MD, Jose Gilberto Bazan, MD and Sally B. Cheston, MD.
Papers3
Topics Dr. Fields writes about most
- Radiotherapy Planning, Computer-Assisted
Dr. Fields' most frequent co-authors
- Douglas W. Arthur, MD1 shared paper
- Jose Gilberto Bazan, MD1 shared paper
- Sally B. Cheston, MD1 shared paper
Recent publications by Dr. Fields
BrachytherapyComputer SimulationIodine Radioisotopes
Int J Radiat Oncol Biol Phys
Antimetabolites, AntineoplasticBody WeightCarcinoma, Squamous Cell
See who Dr. Fields researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Fields works with, so you can find a warm path to the right radiation oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Marc T. Fields received $135 in industry payments from 2017 to 2018
CMS Open Payments shows 4 general payments to Dr. Fields from 3 drug and device companies from 2017 to 2018. Food and beverage make up the largest share, 100% of the total. GE Healthcare paid the most, $89.
General payments to Dr. Fields by program year, 2017 to 2018
Companies that paid Dr. Fields the most, 2017 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marc T. Fields graduated from UMKC School of Medicine
Dr. Fields graduated from UMKC School of Medicine in 1994. Dr. Fields is a member of ASCO.
- Medical school
- Board certified in radiation oncology
Source: Dmand AI Professional Profile Data
Dr. Marc T. Fields accepts plans from 8 insurance carriers
Dr. Fields is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Kaiser Permanente. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Humana
- Regence Health Plans
- CMS Medicare
Plan types Dr. Fields accepts, by number of carriers
- Medicare7
- PPO6
- POS3
- EPO2
- HMO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Marc T. Fields's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marc T. Fields
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marc T. Fields' NPI number?
Dr. Marc T. Fields' NPI number is 1730143066. It was assigned on April 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marc T. Fields?
Dr. Marc T. Fields is a radiation oncologist in Rohnert Park, California. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Marc T. Fields practice?
Dr. Fields practices at 301 Professional Center Dr, Rohnert Park, CA 94928. Dr. Fields' primary practice is Rohnert Park Cancer Center in Rohnert Park, California. Dmand AI also links Dr. Fields to 2 group practices and clinics and 1 medical group.
What is Dr. Marc T. Fields' office phone number?
The practice phone on file for Dr. Fields is (707) 584-2200.
What is Dr. Marc T. Fields' medical license number?
Dr. Fields' California license number on file is C52087, one of the licenses on file in 3 states.
Which states has Dr. Marc T. Fields been licensed in?
Dmand AI has state licenses on file for Dr. Fields in California (2005 to 2025), Arizona (2001 to 2007) and Michigan (1999 to 2006).
What medical group is Dr. Marc T. Fields part of?
Dr. Fields is linked to The Permanente Medical Group, Inc. Dmand AI links Dr. Fields to 1 more medical group.
Does Dr. Marc T. Fields accept Medicare?
Yes. CMS data shows Dr. Fields billed Medicare for 12 services in 2023, and Dr. Fields accepts Medicare assignment.
Is Dr. Marc T. Fields board certified?
Yes. Dr. Fields is board certified in radiation oncology by the American Board of Radiology.
What services does Dr. Marc T. Fields bill to Medicare?
In 2023, Dr. Fields' most billed Medicare services were radiation oncology (77280).
Show 7 more questionsShow fewer questions
Where did Dr. Marc T. Fields go to medical school?
Dr. Fields graduated from UMKC School of Medicine in 1994.
What drugs does Dr. Marc T. Fields prescribe most?
In 2024 Medicare Part D data, Dr. Fields' most prescribed drugs by claims were Lidocaine HCl Viscous, Chlorhexidine Gluconate and Hydrocodone-Acetaminophen.
Has Dr. Marc T. Fields received payments from drug or device companies?
CMS Open Payments shows $135 in general payments to Dr. Fields from 3 companies from 2017 to 2018. The largest total came from GE Healthcare.
How long has Dr. Marc T. Fields been practicing?
Dr. Fields graduated from medical school in 1994, 32 years ago.
Does Dr. Marc T. Fields do research?
Dmand AI links 3 publications to Dr. Fields.
Who does Dr. Marc T. Fields publish with?
Dr. Fields' most frequent co-authors are Douglas W. Arthur, MD (1 shared paper), Jose Gilberto Bazan, MD (1 shared paper) and Sally B. Cheston, MD (1 shared paper).
What insurance does Dr. Marc T. Fields accept?
Dr. Fields is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Kaiser Permanente. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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