Shaun J. Gillis, MD

Medicare activity in 2024

Official CMS public-use data for Shaun J. Gillis, 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. Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)32 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)23 services
3. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)19 services
4. Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)13 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 cholesterol54%
• High blood pressure46%
• Arthritis42%
• Osteoporosis28%
• Anxiety16%
• Depression15%

Hospitals where Shaun J. Gillis works

Medicare's Facility Affiliation Data lists Shaun J. Gillis 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.

• Bozeman Health Deaconess HospitalBozeman, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270057

Practice locations

Addresses where Shaun J. Gillis is enrolled with Medicare (CMS data updated October 2, 2026).

• 905 Highland Blvd, Suite 4500Bozeman, MT 59715 (406) 414‑5150
• 915 Highland BlvdBozeman, MT 59715 (406) 414‑5000
• 925 Highland BlvdBozeman, MT 59715
• 925 Highland Blvd, Suite 1220Bozeman, MT 59715 (406) 414‑3780

Group practices

Medicare enrollment lists Shaun J. Gillis as a member of this group (CMS data updated October 2, 2026).

• Bozeman Health Deaconess Hospital320 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in Montana →

Other OB-GYNs in Bozeman

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

• Jennifer A. Adey, MD
• Marcia Voigt, MD
• Jennifer L. Yarger, MD
• Renee A. Frederickson, MD
• Jami L. Chisdak, MD
• Rebecca Fox, DO
• Colleen Killian, MD
• Shaina Long, PA

All OB-GYNs in Bozeman →

Other clinicians in Bozeman Health Deaconess Hospital

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

• Christopher A. Martin, MD
• Gyorgy Mundruczo, MD
• Nathanial J. Madsen, MD
• Lauren M. Hastings, NP
• Shauna K. Werth Kronfuss, MD
• Thomas G. Hildner, MD

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