Quick answers
- Does Lyle J. Onstad Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Lyle J. Onstad 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 Lyle J. Onstad Iii see?
- In 2024, CMS data shows 303 Original Medicare patients and 1,980 services for Lyle J. Onstad Iii. This counts Original Medicare only and measures volume, not quality.
- What is Lyle J. Onstad Iii's NPI number?
- 1639105968. 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 Lyle J. Onstad 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 | 303 |
|---|---|
| Services billed to Medicare | 1,980 |
| Different services or procedures | 42 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)399 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)344 services
- Annual alcohol misuse screening, 5 to 15 minutes (G0442)169 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)157 services
- Annual depression screening, 5 to 15 minutes (G0444)155 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 cholesterol75%
- High blood pressure67%
- Arthritis40%
- Diabetes24%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)18%
- Ischemic heart disease17%
Hospitals where Lyle J. Onstad Iii works
Medicare's Facility Affiliation Data lists Lyle J. Onstad 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.
- 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
- Northern Montana HospitalHavre, MT · Critical Access Hospital · Emergency services: listed by Medicare · CCN 271348
Practice locations
Addresses where Lyle J. Onstad Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 401 15th Ave S, Suite 201Great Falls, MT 59405 (406) 727‑2121
Specialties
- Family Practiceprimary
Other family doctors in Great Falls
Clinicians with the same Medicare primary specialty in Great Falls, MT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 1998 (28 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639105968 |
| 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