Quick answers
- Does Nathanial J. Madsen accept Medicare assignment?
- Yes. Medicare's clinician data says Nathanial J. Madsen 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 Nathanial J. Madsen see?
- In 2024, CMS data shows 606 Original Medicare patients and 1,400 services for Nathanial J. Madsen. This counts Original Medicare only and measures volume, not quality.
- What is Nathanial J. Madsen's NPI number?
- 1609927607. 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 Nathanial J. Madsen, 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 | 606 |
|---|---|
| Services billed to Medicare | 1,400 |
| Different services or procedures | 42 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)390 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)275 services
- Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes (99152)97 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)81 services
- Ultrasonic guidance for blood vessel access (76937)77 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 pressure75%
- High cholesterol70%
- Ischemic heart disease46%
- Arthritis45%
- Atrial fibrillation40%
- Heart failure35%
Hospitals where Nathanial J. Madsen works
Medicare's Facility Affiliation Data lists Nathanial J. Madsen 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.
- Billings Clinic HospitalBillings, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270004
- Bozeman Health Big Sky Medical CenterBig Sky, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271389
- Bozeman Health Deaconess HospitalBozeman, MT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 270057
- Livingston HealthcareLivingston, MT · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 271317
- Madison Valley Medical CenterEnnis, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271329
Practice locations
Addresses where Nathanial J. Madsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 935 Highland Blvd, Suite 2210Bozeman, MT 59715 (406) 414‑4000
Group practices
Medicare enrollment lists Nathanial J. Madsen as a member of this group (CMS data updated October 2, 2026).
- Bozeman Health Deaconess Hospital320 clinicians in the group
Specialties
Other interventional cardiologists in Montana
Clinicians with the same Medicare primary specialty in Montana — not a recommendation.
Other clinicians in Bozeman Health Deaconess Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609927607 |
| 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