Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Zachary McLean Oswald, OD

Individual provider Optometrist · NPI 1275810079

Dr. Zachary McLean Oswald, OD is registered under Optometry in Dillon, Montana. Qualified in 2011, 15 years ago. Works from 4 locations and accepts Medicare assignment. Licensed in Idaho, Montana, Oregon and Utah.

Years since qualifying
15
Licensed in
ID, MT, OR, UT
In the registry since
2011
Specialties on file
4
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

25 Johnson Ave
Dillon, MT 59725-3323
Phone: (406) 683-2020
Fax: (406) 683-6409
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 2540 Channing Way, Idaho Falls, ID 83404 — (208) 529-2700
  • 2540 Channing Way, Idaho Falls, ID 83404-7515 — (208) 529-2700
  • 2540 Channing Way, Idaho Falls, ID 83404-7515 — (208) 529-2700

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence OPT-OPT-LIC-3096 (MT)
Optometrist Taxonomy 152W00000X · Licence 9885098-9934 (UT)
Optometrist Taxonomy 152W00000X · Licence 3437ATI (OR)
Optometrist Taxonomy 152W00000X · Licence ODP-100231 (ID)

Record details

NPI number1275810079
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorNo
NPI enumeratedNovember 8, 2011
Last updated in NPPESMarch 25, 2020
Certification dateMarch 25, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPTOMETRY
Medical schoolOTHER
Graduated 2011 (15 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Cataract surgery 85 times · 72nd percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients463
Services billed 1,648 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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