John C. Kortenber, OD
Optometrist · Algona, IA
John C. Kortenber, OD is an optometrist with a practice address in Algona, Iowa, and NPI 1821049586, issued on May 15, 2006. Check the license with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John C. Kortenber
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 2002014339 MO
Self-reported in NPPES; status is on the state search - Practice location
- 112 N Thorington St, Algona, IA 50511
- Phone
- (515) 395-3937
- Enumerated
- May 15, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (515) 395-3938
- Medicare enrollment
- Enrolled (PECOS I20060601000041); accepts Medicare assignment
- Medical or professional school
- University Of Missouri St Louis - School Of Optometry, 2001
- Entity
- Type 1 · individual
8 nearest optometrist records → All 676 in Iowa → Look up another NPI →
Verify John C. Kortenber in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% more Medicare Part D claims than the average optometrist in 2024
320 Medicare Part D claims for 73 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Latanoprost218 claims
- Timolol Maleate54 claims
- Tobramycin-Dexamethasone13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $15.49
1 payment: food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 34,453 providers of this specialty with any payment received $769.99 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John C. Kortenber among 676 optometrist records in Iowa
John C. Kortenber, OD is one of 676 optometrist records with a practice address in Iowa. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 18% of them.
- NPI issued2006 · 18% of these records are older, 44% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2001 · median 2006 among the 462 with a school on file
- Record last updated2023 · 74% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 optometrist records list a practice address in Algona
They are 5 of the 85 NPPES records with a practice address in Algona, and 676 optometrist records in Iowa.
All 676 in Iowa → Every provider in Algona → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Donald Kingfield, O.D.Algona, IA 505111336157510
- Alan Klepper, ODAlgona, IA 505111427084789
- James Schuchert, ODAlgona, IA 505111407999808
- Tony Trainer, ODAlgona, IA 505111558390906
- Ryan Brown, O.D.Fort Dodge, IA 505011659333870
- Jeffrey Foreman, O.D.Fort Dodge, IA 505011205808359
- Brandon Hauck, O.D.Fort Dodge, IA 505011346620432
- Brent Heath, O.D.Fort Dodge, IA 505011952437105
Common questions
What is John C. Kortenber, OD's NPI number?
John C. Kortenber, OD's National Provider Identifier (NPI) is 1821049586, issued on May 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John C. Kortenber, OD located?
The NPPES record lists a practice address at 112 N Thorington St, Algona, IA, 50511. Phone: (515) 395-3937. Providers update this record themselves, so call before visiting.
How can I verify John C. Kortenber, OD's license?
Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
How much does John C. Kortenber, OD prescribe under Medicare Part D?
In 2024, John C. Kortenber, OD had 320 Medicare Part D claims for 73 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.