Quick answers
- Does Roy W. Zimmer Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Roy W. Zimmer Iii accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Roy W. Zimmer Iii see?
- In 2024, CMS data shows 1,405 Original Medicare patients and 2,395 services for Roy W. Zimmer Iii. This counts Original Medicare only and measures volume, not quality.
- What is Roy W. Zimmer Iii's NPI number?
- 1780609958. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Roy W. Zimmer Iii, 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.
| Original Medicare patients | 1,405 |
|---|---|
| Services billed to Medicare | 2,395 |
| Different services or procedures | 70 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Screening mammography (77067)672 services
- Screening 3d breast mammography (77063)660 services
- X-ray of chest, 2 views (71046)151 services
- Ct scan of abdomen and pelvis with contrast (74177)84 services
- Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) (G0279)67 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 pressure58%
- High cholesterol58%
- Arthritis41%
- Anxiety23%
- Depression22%
- Osteoporosis21%
Hospitals where Roy W. Zimmer Iii works
Medicare's Facility Affiliation Data lists Roy W. Zimmer Iii 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.
- Bitterroot Health - Daly HospitalHamilton, MT · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 271340
- Clark Fork Valley HospitalPlains, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271323
- Community Medical CenterMissoula, MT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 270023
- Providence St Joseph Medical CenterPolson, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271343
- St. Patrick HospitalMissoula, MT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 270014
Practice locations
Addresses where Roy W. Zimmer Iii is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1200 12th Ave SSeattle, WA 98144 (509) 363‑7788
- 2803 S W AveMissoula, MT 59804 (406) 327‑3950
- 2827 Fort Missoula RdMissoula, MT 59804 (509) 363‑7788
- 3275 N Reserve St, Suite AMissoula, MT 59808 (406) 327‑3950
- 500 W Broadway StMissoula, MT 59802 (509) 363‑7788
Group practices
Medicare enrollment lists Roy W. Zimmer Iii as a member of these groups (CMS data updated October 2, 2026).
- Inland Imaging Associates PS126 clinicians in the group
- Advanced Imaging at Community Medical Center, LLC7 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Seattle
Clinicians with the same Medicare primary specialty in Seattle, WA — not a recommendation.
Other clinicians in Inland Imaging Associates PS
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780609958 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians