Mark S. Vantassell, MD

Medicare activity in 2024

Official CMS public-use data for Mark S. Vantassell, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. X-ray of chest, 1 view (71045)505 services
2. X-ray of chest, 2 views (71046)447 services
3. Screening mammography (77067)291 services
4. Screening 3d breast mammography (77063)287 services
5. Dxa bone density measurement of hip, pelvis, spine (77080)182 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure73%
• High cholesterol67%
• Arthritis53%
• Diabetes30%
• Depression28%
• Anxiety27%

Hospitals where Mark S. Vantassell works

Medicare's Facility Affiliation Data lists Mark S. Vantassell at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Benefis Hospitals IncGreat Falls, MT · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 270012
• Benefis Teton Medical CenterChoteau, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271307
• Great Falls Clinic HospitalGreat Falls, MT · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 270086
• Missouri River Medical CenterFort Benton, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271304
• St Peters HealthHelena, MT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 270003

Practice locations

Addresses where Mark S. Vantassell is enrolled with Medicare (CMS data updated October 2, 2026).

• 1101 26th St SGreat Falls, MT 59405 (406) 455‑5000

Group practices

Medicare enrollment lists Mark S. Vantassell as a member of this group (CMS data updated October 2, 2026).

• Benefis Hospitals Inc384 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in Montana →

Other radiologists in Great Falls

Clinicians with the same Medicare primary specialty in Great Falls, MT — not a recommendation.

• Tyler L. Will, MD
• Jeffrey R. Kessler, MD
• Chad Reihm, MD
• Shams Jubouri, MD
• Kelcie L. Foshag, MD
• George Ro, MD
• Matthew Wetzel, MD
• Michael Dressen, MD

All radiologists in Great Falls →

Other clinicians in Benefis Hospitals Inc

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Brandi L. Fleming, NP
• Brian J. Malloy, MD
• Melanie M. Brown, NP
• Bradley S. Hill, MD
• Alexander Ortiz, PA
• Michael J. Briggs, DO

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians