Gerald W. Koskinen, OD.
Optometrist · East Troy, WI
Gerald W. Koskinen, OD. is an optometrist with a practice address in East Troy, Wisconsin, and NPI 1780733477, issued on Jan 10, 2007. Check the license (Wisconsin 2184, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gerald W. Koskinen
- Credential
- OD.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 2184 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3278 W Main St, East Troy, WI 53120
- Phone
- (262) 642-9719
- Enumerated
- Jan 10, 2007
- Record last updated
- Jan 28, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (262) 642-2228
- Medicaid ID
- 38574600 WI
- Medicare enrollment
- Enrolled (PECOS I20080903000404); accepts Medicare assignment
- Medical or professional school
- Illinois College Of Optometry At Chicago, 1987
- Entity
- Type 1 · individual
8 nearest optometrist records → All 1,161 in Wisconsin → Look up another NPI →
Verify Gerald W. Koskinen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 2184Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average optometrist in 2024
198 Medicare Part D claims for 83 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Latanoprost76 claims
- Timolol Maleate41 claims
- Neomycin-Polymyxin-Dexameth38 claims
- Tobramycin-Dexamethasone11 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: $221.45
10 payments; by number, the most common kind was food and beverage; the largest payer was CooperVision 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.
Bills Medicare through one group practice
- Koskinen Eye Clinic, LLCEast Troy, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gerald W. Koskinen among 1,161 optometrist records in Wisconsin
Gerald W. Koskinen, OD. is one of 1,161 optometrist records with a practice address in Wisconsin. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 50% of them.
- NPI issued2007 · 50% of these records are older, 40% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1987 · median 2008 among the 752 with a school on file
- Record last updated2009 · 62% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 optometrist records list a practice address in East Troy
They are 3 of the 62 NPPES records with a practice address in East Troy, and 1,161 optometrist records in Wisconsin.
All 1,161 in Wisconsin → Every provider in East Troy → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Sandra Huenink, ODEast Troy, WI 531201902258742
- Danielle Knight, ODEast Troy, WI 531201174442511
- John HallElkhorn, WI 531211376575423
- Kevin Harry, ODElm Grove, WI 531221821078189
- Timothy Hell, ODElm Grove, WI 531221598078859
- Amanda Kopczyk, O.D.Elm Grove, WI 531221982964730
- Ronald Henson, O.D.Delavan, WI 531151508967282
- Anne-Marie Laschen, O.D.Delavan, WI 531151588614549
Common questions
What is Gerald W. Koskinen, OD.'s NPI number?
Gerald W. Koskinen, OD.'s National Provider Identifier (NPI) is 1780733477, issued on Jan 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gerald W. Koskinen, OD. located?
The NPPES record lists a practice address at 3278 W Main St, East Troy, WI, 53120. Phone: (262) 642-9719. Providers update this record themselves, so call before visiting.
How can I verify Gerald W. Koskinen, OD.'s license?
NPPES lists Wisconsin license number 2184, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Gerald W. Koskinen, OD. prescribe under Medicare Part D?
In 2024, Gerald W. Koskinen, OD. had 198 Medicare Part D claims for 83 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.