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

Michael L Korthals, OD

Individual provider Optometrist · NPI 1407880883

Michael L Korthals, OD is an Optometry in Mason City, Iowa. Graduated from Illinois College of Optometry at Chicago in 1999, 27 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
27
Trained at
Illinois College of Optometry at Chicago
Licensed in
IA
In the registry since
2006
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

422 S Pierce Ave
Mason City, IA 50401-2709
Phone: (641) 424-0780
Fax: (641) 424-2345
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 02146 (IA)

Record details

NPI number1407880883
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorYes
NPI enumeratedJuly 10, 2006
Last updated in NPPESDecember 14, 2023
Certification dateDecember 14, 2023

Medicare enrollment

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

Medicare specialtyOPTOMETRY
Medical schoolILLINOIS COLLEGE OF OPTOMETRY AT CHICAGO
Graduated 1999 (27 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Mason City