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

Individual provider Optometrist · NPI 1285245274

Joseph Foster Jahner, OD is registered under Optometry in Grinnell, Iowa. Qualified in 2020, 6 years ago. Practices with Jensen Optometrists PLLC, a 2-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
6
Licensed in
IA
In the registry since
2020
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

935 Broad St
Grinnell, IA 50112-2047
Phone: (641) 891-7263
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1012 E Competine St Apt 203, Knoxville, IA 50138-1962 — (641) 891-7263

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 101219 (IA)

Record details

NPI number1285245274
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorYes
NPI enumeratedAugust 12, 2020
Last updated in NPPESAugust 12, 2020
Certification dateAugust 12, 2020

Medicare enrollment

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

Medicare specialtyOPTOMETRY
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice Jensen Optometrists Pllc — 2 clinicians
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 26 times · 50th percentile
Removal of skin lesions 1–10 times

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 patients216
Services billed 346 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.

Colleagues at Jensen Optometrists PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Grinnell