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- 112 N Thorington St, Algona, IA 50511
About Dr. Kortenber
John C. Kortenber, OD is an optometrist based in Algona, IA. John is a 2001 graduate of University of Missouri St Louis - School of Optometry. According to Medicare claims data, John cared for 482 Medicare patients across 554 services. The services billed most often include established patient problem focused exam of visual system, imaging of retina, and imaging of optic nerve. The provider's National Provider Identifier (NPI) is 1821049586.
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
- (515) 395-3937
- Email not available
Practice Locations
112 N THORINGTON ST
Algona, IA 50511
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
- Astigmatism
- Dry eye
- Nearsightedness
- Pink eye
- Presbyopia
Contact lens issues
- Contact Lens Intolerance
Cornea conditions
- Keratoconus
- Pterygium
Corneal issues
- Corneal Neovascularization
- Eye Sunburn
Eye conditions
- Broken Blood Vessel in Eye
Eye discomfort
- Burning Eyes
- Discharge from Eye
- Red Eyes
Eye diseases
- Cataracts
- Diabetic retinopathy
- Glaucoma
- Macular degeneration
- Retinal Tear Symptoms
Eye infections
- Corneal ulcer
Eye inflammation
- Iritis
Eye injuries
- Corneal abrasion
- Foreign Object in Eye
Eye irritation
- Eye Allergies
- Eye Pain
- Watery Eyes
Eye surface issues
- Yellow Bump on Eye
Eyelid conditions
- Blepharitis
- Drooping eyelid
- Eye Twitching
- Stye
Eyelid issues
- Chalazion
- Ectropion
- Entropion
- Eyelash Lice or Dandruff
Pediatric eye conditions
- Eye misalignment (strabismus)
- Lazy eye (amblyopia)
Pupil issues
- Unequal Pupil Sizes
Tear duct issues
- Blocked tear duct
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 fitting
- Dry eye treatment
- Eye exam
- Glasses prescription
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
- Autologous Serum Eye Drops Fitting
- IPL for Dry Eye
- LipiFlow Treatment
- Meibomian Gland Expression
Examinations
- Comprehensive medical eye examination
- Diabetic Eye Exam
- DMV Vision Test
- Low Vision Assessment
- Pediatric Eye Exam
Eyelid care
- Eyelid Deep Cleaning
Eyelid treatments
- Stye Removal
General exams
- School Vision Screening Follow-Up
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
- Optical Coherence Tomography Scan
Minor procedures
- Amniotic Membrane Placement
- Tear Duct Plugs
Specialty lenses
- Ortho-K
- RGP Contact Lens Fitting
- Scleral Lens Fitting
Surgical evaluations
- Cataract Evaluation
- Corneal Cross-Linking Evaluation
- LASIK Consultation
- PRK Evaluation
Tear duct procedures
- Flushing of Tear Ducts
Therapy
- Sports Vision Training
- Vision Therapy
Urgent care
- Emergency Eye Care
- Foreign Object Removal from Eye
Vision correction
- Myopia Management
Procedures Most Often Billed to Medicare
554 services · 482 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
34 | As often as other peers in Optometrist |
| Removal of recurring cataract in lens capsule using a laser | Procedure | 66821 |
11 | Less often than most peers in Optometrist |
| Established patient problem focused exam of visual system | Treatment | 92012 |
285 | More than most peers in Optometrist |
| Imaging of retina | Treatment | 92134 |
55 | More often than most peers in Optometrist |
| Imaging of optic nerve | Treatment | 92133 |
49 | More often than most peers in Optometrist |
| Exam of visual field with extended testing | Treatment | 92083 |
48 | More often than most peers in Optometrist |
| New patient problem focused exam of visual system | Treatment | 92002 |
47 | More often than most peers in Optometrist |
| Established patient complete exam of visual system | Treatment | 92014 |
25 | Less 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.
Also at this address 1
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 Algona 4
Same specialty, same city.
Trained at University of Missouri St Louis - School of Optometry 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2001 at University of Missouri St Louis - School of Optometry 8
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 Dr. Kortenber?
Dr. Kortenber is an optometrist in Algona, IA. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is Dr. Kortenber's address?
Dr. Kortenber is listed at 112 N Thorington St, Algona, IA 50511. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Kortenber?
The number on file is (515) 395-3937. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Kortenber's NPI number?
Dr. Kortenber's National Provider Identifier is 1821049586. 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 Dr. Kortenber train?
Dr. Kortenber attended University of Missouri St Louis - School of Optometry, graduating in 2001. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Kortenber been practicing?
Dr. Kortenber has 25 years experience. Calculated from a graduation year of 2001, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Kortenber perform?
According to Medicare billing data, Dr. Kortenber performs procedures including removal of cataract with insertion of prosthetic lens and removal of recurring cataract in lens capsule using a laser; provides treatments such as established patient problem focused exam of visual system and imaging of retina. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Kortenber confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Kortenber. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.