Radiation Oncology in Montana
26 licensed radiation oncologists practicing in Montana across 9 cities.
This page republishes public records from the federal NPI Registry, which every licensed U.S. healthcare provider is required to maintain. These are federal-agency records, not a directory we compile.
Source: NPI Registry · last checked
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NPI Registry records — Radiation Oncology in Montana
19 of 26 shown have disclosed payments in CMS Open Payments (2024)
Showing 26 of 26 federal NPI records, alphabetical by last name. Contact details come directly from the NPI Registry — verify currency with the provider's office. Pharma / device payment disclosures from CMS Open Payments are shown where the physician appears in that federal database.
Christopher Barnett Baker, MD
931 Highland Blvd Ste 3130
Bozeman, MT 59715 · (406) 414-5070
License: MED-PHYS-LIC-127559 (MT)
In 2024, $1,297 was disclosed to this physician across 45 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($834) and meals and beverages ($463).
Largest single payer: Philips North America LLC ($518).
In 2024, $29 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($29).
Largest single payer: Siemens Medical Solutions USA, Inc. ($29).
Berna Roig Demalignon, MD
202 2nd Ave S Ste 103
Great Falls, MT 59405 · (406) 991-3957
License: 57381 (MT)
In 2024, $70 was disclosed to this physician across 3 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($70).
Largest single payer: Siemens Medical Solutions USA, Inc. ($29).
Ian Salzman Gallaher, MD
401 W Poplar St
Walla Walla, WA 99362 · (509) 897-5700
License: MD61349342 (WA)
In 2024, $20 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($20).
Largest single payer: Siemens Medical Solutions USA, Inc. ($20).
In 2023, $30 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($30).
Christopher Dave Hellekson, MD
900 N Orange St Ste 202
Missoula, MT 59802 · (406) 327-3362
License: MED-PHYS-LIC-10457 (MT)
In 2024, $164 was disclosed to this physician across 8 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($164).
Largest single payer: ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) ($55).
In 2024, $61 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($61).
Largest single payer: Novocure Inc. ($61).
In 2024, $30 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($30).
Largest single payer: Siemens Medical Solutions USA, Inc. ($30).
In 2024, $371 was disclosed to this physician across 4 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($371).
Largest single payer: HISTOSONICS, INC. ($301).
Katherine Lee Markette, MD
500 W Broadway St, Radiation Oncology/st Patrick Hospital
Missoula, MT 59802 · (406) 329-5655
License: 5186 (MT)
Margaret Murga Menendez, MD
500 W Broadway St
Missoula, MT 59802 · (406) 329-5655
License: 8242 (MT)
Trent Donald Mihalick, MD
1315 Golden Valley Cir
Billings, MT 59102 · (406) 238-6290
License: 7435 (MT)
In 2024, $30 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($30).
Largest single payer: Siemens Medical Solutions USA, Inc. ($30).
In 2023, $237 was disclosed to this physician across 6 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($237).
Michelle Ann Proper, MD
2827 Fort Missoula Rd
Missoula, MT 59804 · (406) 327-3911
License: 27289 (MT)
In 2024, $21 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($21).
Largest single payer: Elekta, Inc. ($21).
In 2024, $173 was disclosed to this physician across 10 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($173).
Largest single payer: Siemens Medical Solutions USA, Inc. ($29).
In 2024, $21 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($21).
Largest single payer: Merck Sharp & Dohme LLC ($21).
In 2023, $36 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($36).
Elizabeth M Tapen, MD
2091 Little Coyote Rd Ste 161029
Big Sky, MT 59716 · (845) 797-8700
License: 2323381 (NY)
In 2024, $52 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($52).
Largest single payer: Janssen Biotech, Inc. ($28).
Rebecca Susan Tarlton, MD
1315 Golden Valley Cir
Billings, MT 59102 · (406) 238-6290
License: 48212 (MT)
In 2023, $43 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($43).
Breanne Elizabeth Terakedis, MD
801 N 29th St
Billings, MT 59101 · (406) 238-2500
License: 33403 (MT)
In 2024, $21 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($21).
Largest single payer: Merck Sharp & Dohme LLC ($21).
In 2024, $427 was disclosed to this physician across 24 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($427).
Largest single payer: NOVARTIS PHARMACEUTICALS CORPORATION ($161).
Payment totals shown for the latest published program year (2024). Presence of disclosed payments is not, on its own, a conflict of interest. Physicians dispute records directly with CMS (dispute process). How we show this.
Open Payments figures as displayed on . Corrections flow from the manufacturer through CMS and are adopted on our next refresh.
What this page is: a republication of public federal NPI Registry records, filtered to the radiation oncology taxonomy. It is not a directory we curate, and inclusion is automatic based on each provider's own NPI filing with CMS. Providers who believe their NPI record is inaccurate should update it directly with CMS at npiregistry.cms.hhs.gov; our next refresh adopts the corrected federal record.
Practice info disclaimer: Provider addresses and phone numbers come from the NPI Registry, which providers update at their discretion. Always call ahead to confirm the provider is currently accepting patients and is at the listed address.
Medical disclaimer: This page is not a quality ranking and does not constitute medical advice or endorsement. Choose a provider in consultation with your primary care physician or care team.
Source: NPI Registry (taxonomy: Radiation Oncology) · Last checked: 2026-04-20