Quick answers
- Does Zachary M. Oswald accept Medicare assignment?
- Yes. Medicare's clinician data says Zachary M. Oswald 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 Zachary M. Oswald see?
- In 2024, CMS data shows 463 Original Medicare patients and 1,648 services for Zachary M. Oswald. This counts Original Medicare only and measures volume, not quality.
- What is Zachary M. Oswald's NPI number?
- 1275810079. 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 Zachary M. Oswald, 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 | 463 |
|---|---|
| Services billed to Medicare | 1,648 |
| Different services or procedures | 19 |
| 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)359 services
- Established patient complete exam of visual system (92014)351 services
- Photography of the retina (92250)339 services
- Imaging of retina (92134)174 services
- Exam of visual field with extended testing (92083)133 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 pressure59%
- High cholesterol50%
- Arthritis43%
- Diabetes20%
- Osteoporosis14%
- Atrial fibrillation14%
Practice locations
Addresses where Zachary M. Oswald is enrolled with Medicare (CMS data updated October 2, 2026).
- 25 Johnson AveDillon, MT 59725 (406) 683‑2020
Specialties
- Optometryprimary
Other optometrists in Montana
Clinicians with the same Medicare primary specialty in Montana — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Graduation year | 2011 (15 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275810079 |
| 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
- 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