Quick answers
- Does Gerald W. Koskinen Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Gerald W. Koskinen Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gerald W. Koskinen Jr. see?
- In 2024, CMS data shows 255 Original Medicare patients and 2,758 services for Gerald W. Koskinen Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Gerald W. Koskinen Jr.'s NPI number?
- 1780733477. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gerald W. Koskinen Jr., data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 255 |
|---|---|
| Services billed to Medicare | 2,758 |
| Different services or procedures | 15 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Removal of cataract with insertion of prosthetic lens (66984)2,250 services
- Photography of the retina (92250)226 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)176 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)35 services
- Imaging of retina (92134)17 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol66%
- High blood pressure60%
- Arthritis38%
- Chronic kidney disease19%
- Diabetes17%
- Ischemic heart disease16%
Practice locations
Addresses where Gerald W. Koskinen Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 3278 Main St, Suite BEast Troy, WI 53120 (262) 642‑9719
- 3278 W Main St B, PO Box 165East Troy, WI 53120
Group practices
Medicare enrollment lists Gerald W. Koskinen Jr. as a member of this group (CMS data updated October 2, 2026).
- Koskinen Eye Clinic, LLC2 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Other clinicians in Koskinen Eye Clinic, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 1987 (39 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780733477 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians