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Edit this profileAt a glance
- 422 S Pierce Ave, Mason City, IA 50401
About Dr. Korthals
Michael L. Korthals, O.D. is an optometrist based in Mason City, IA. Michael is a 1999 graduate of Illinois College of Optometry at Chicago. Medicare claims data shows Michael provided 3,014 services to 2,544 patients. The services billed most often include photography of the retina, imaging of front third of eye using a special microscope, and photography of content of eyes. The provider's National Provider Identifier (NPI) is 1407880883.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (641) 424-0780
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
422 S PIERCE AVE
Mason City, IA 50401
Conditions Commonly Evaluated or Treated
Within Optometry generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Contact lens issues
Cornea conditions
Corneal issues
Eye conditions
Eye discomfort
Eye diseases
Eye infections
Eye inflammation
Eye injuries
Eye irritation
Eye surface issues
Eyelid conditions
Eyelid issues
Pediatric eye conditions
Pupil issues
Tear duct issues
Vision changes
- Blurry Vision
- Color Blindness
- Distorted Vision
- Double Vision
- Eye Floaters and Flashes
- Eye Strain
- Farsightedness
- Halos Around Lights
- Light Sensitivity
- Night Blindness
- Posterior vitreous detachment
- Tunnel Vision
- Visual Migraines
Procedures & services
Most searched procedures
Contact lens exams
- Bifocal or Multifocal Contact Lens Fitting
- Contact Lens Training
- Plano (Non-Prescription) Colored Contact Lens Exam
- Toric Contact Lens Fitting
Dry eye treatments
Examinations
- Comprehensive medical eye examination
- Diabetic Eye Exam
- DMV Vision Test
- Low Vision Assessment
- Pediatric Eye Exam
Eyelid care
Eyelid treatments
General exams
Glasses and eyewear
- Blue Light Glasses Consultation
- Eyeglass Frame Adjustment and Repair
- Prescription Sunglasses Consultation
- Prism Eyeglasses Fitting
Imaging & tests
- Color Vision Testing
- Corneal topography
- Coronary optical coherence tomography
- Eye-pressure measurement
- Pachymetry
- Retinal photography
- Visual Field Test
Imaging and scans
Minor procedures
Specialty lenses
Surgical evaluations
Tear duct procedures
Therapy
Urgent care
Vision correction
Procedures Most Often Billed to Medicare
3,014 services · 2,544 patients · 14 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
92 | More often than most peers in Optometrist |
| Closure of tear duct opening using plug | Procedure | 68761 |
84 | More often than most peers in Optometrist |
| Photography of the retina | Treatment | 92250 |
529 | More than most peers in Optometrist |
| Imaging of front third of eye using a special microscope | Treatment | 92286 |
513 | More than most peers in Optometrist |
| Photography of content of eyes | Treatment | 92285 |
493 | More than most peers in Optometrist |
| Established patient complete exam of visual system | Treatment | 92014 |
475 | More than most peers in Optometrist |
| Exam of visual field with extended testing | Treatment | 92083 |
99 | More often than most peers in Optometrist |
| Imaging of optic nerve | Treatment | 92133 |
98 | More often than most peers in Optometrist |
| New patient complete exam of visual system | Treatment | 92004 |
82 | More often than most peers in Optometrist |
| Measurement of retinal and optic nerve function | Treatment | 92273 |
68 | More often than most peers in Optometrist |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other optometrists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other optometrists in Mason City 7
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at Illinois College of Optometry at Chicago 8
Other providers in the same specialty who trained at the same institution.
Class of 1999 at Illinois College of Optometry at Chicago 7
Providers who graduated from the same medical school in the same year.
Also performs Removal of cataract with insertion of prosthetic lens 8
Providers in IA who bill this service to Medicare most often.
Common questions
What kind of doctor is Michael L. Korthals?
Michael L. Korthals is an optometrist in Mason City, IA. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is Michael L. Korthals's address?
Michael L. Korthals is listed at 422 S Pierce Ave, Mason City, IA 50401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Michael L. Korthals?
The number on file is (641) 424-0780. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Michael L. Korthals?
Michael L. Korthals's National Provider Identifier is 1407880883. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Michael L. Korthals train?
Michael L. Korthals attended Illinois College of Optometry at Chicago, graduating in 1999. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Michael L. Korthals have?
Michael L. Korthals has 27 years experience. Calculated from a graduation year of 1999, reported in the CMS National Downloadable File.
CMS public data
What procedures does Michael L. Korthals perform?
According to Medicare billing data, Michael L. Korthals performs procedures including removal of cataract with insertion of prosthetic lens and closure of tear duct opening using plug; provides treatments such as photography of the retina and imaging of front third of eye using a special microscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Michael L. Korthals's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Michael L. Korthals. If this is you, claiming it is free.
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