Dr. William Breen, MD

Dr. Breen practices at Mayo Clinic Hospital, Saint Marys Campus in Rochester, Minnesota, part of Mayo Clinic.

Dr. Breen's NPI, 1437683562, was assigned on April 15, 2017. Dr. Breen holds Minnesota license 64064.

Dr. Breen's primary practice is Mayo Clinic Hospital, Saint Marys Campus, at 1216 Second Street Southwest, Rochester, MN 55902 in Olmsted County. The practice phone is (507) 255-5123.

Dr. Breen's primary practice is Mayo Clinic Hospital, Saint Marys Campus in Rochester, Minnesota, part of Mayo Clinic. The medical group on file is Mayo Clinic. Dmand AI also links Dr. Breen to 3 more medical groups and 1 hospice, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Breen practices, 2 sites in all. Vendor and product names are available with a free account.

Radiation oncology is Dr. Breen's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Breen is licensed in Minnesota.

CMS data shows 1,860 Medicare services from Dr. Breen across 16 procedure codes in 2024, for 234 Medicare patients. Medicare paid $134,441 for them.

CMS counts 234 Medicare patients who saw Dr. Breen in 2024. The largest group is 65 to 74, with 125 patients. 71% of them have high cholesterol, and 68% have high blood pressure. 6% are also on Medicaid. Their average risk score is 2.12, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Breen's median patient age at 67, with 40% women.

In 2024, Dr. Breen wrote 47 Medicare Part D claims for 30 patients. 96% of them were for generic drugs. CMS names the drug for 17 of them, across 1 drug with 11 or more claims each, at $119 in total drug cost. In 2023, CMS named 25 claims across 2 drugs.

Dr. Breen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Breen as offering telehealth.

Dmand AI links 39 papers to Dr. Breen, published from 2023 to 2025. 2024 was the busiest year, with 16. The most frequent topics are Brain Neoplasms, Glioblastoma and Immunotherapy, Adoptive. Dr. Breen has published most often in Adv Radiat Oncol. Dr. Breen's most frequent co-authors are Nadia Nicole Issa Laack, MD, Paul D. Brown, MD and Anita Mahajan, MD.

CMS Open Payments shows 1 general payment to Dr. Breen from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Telix Pharmaceuticals paid the most, $119.