Nikolas S. Diemer, OD
Optometrist · Freeport, IL
Nikolas S. Diemer, OD is an optometrist with a practice address in Freeport, Illinois, and NPI 1588766281, issued on Sep 2, 2006. Check the license with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Nikolas S. Diemer
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- Practice location
- 1000 Kiwanis Dr, Freeport, IL 61032
- Phone
- (815) 235-6177
- Enumerated
- Sep 2, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (815) 235-6180
- Entity
- Type 1 · individual
8 nearest optometrist records → All 2,697 in Illinois → Look up another NPI →
Also registered at 1000 Kiwanis Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jonathan Goulart, ODOptometrist1518065176
- Mariah Katzenberger-Huneke, ODOptometrist1316872989
- Dennis Robinson, ODOptometrist1972605921
Verify Nikolas S. Diemer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois 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
37% fewer Medicare Part D claims than the average optometrist in 2024
174 Medicare Part D claims for 65 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Latanoprost105 claims
- Timolol Maleate40 claims
- Brimonidine Tartrate12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 87.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Nikolas S. Diemer among 2,697 optometrist records in Illinois
Nikolas S. Diemer, OD is one of 2,697 optometrist records with a practice address in Illinois. 71% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 63% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 56% of these records are
- Record last updated2007 · 68% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 optometrist records list a practice address in Freeport
They are 11 of the 480 NPPES records with a practice address in Freeport, and 2,697 optometrist records in Illinois.
All 2,697 in Illinois → Every provider in Freeport → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- David Anderson, O.D.Freeport, IL 610321891747259
- Todd Bussian, ODFreeport, IL 610321639283138
- Lori Dewall, ODFreeport, IL 610321952415465
- Stephanie Fisher, O.D.Freeport, IL 610321275938433
- Jonathan Goulart, ODFreeport, IL 610321518065176
- Jeffrey James, ODFreeport, IL 610321184682635
- Dale Kaney, ODFreeport, IL 610321982718482
- Mariah Katzenberger-Huneke, ODFreeport, IL 610321316872989
Common questions
What is Nikolas S. Diemer, OD's NPI number?
Nikolas S. Diemer, OD's National Provider Identifier (NPI) is 1588766281, issued on Sep 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nikolas S. Diemer, OD located?
The NPPES record lists a practice address at 1000 Kiwanis Dr, Freeport, IL, 61032. Phone: (815) 235-6177. Providers update this record themselves, so call before visiting.
How can I verify Nikolas S. Diemer, OD's license?
Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Nikolas S. Diemer, OD prescribe under Medicare Part D?
In 2024, Nikolas S. Diemer, OD had 174 Medicare Part D claims for 65 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
What is Nikolas S. Diemer, OD's MIPS final score?
The 2023 MIPS final score is 87.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.