Quick answers
- Does Gregory F. Zink accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory F. Zink 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 Gregory F. Zink see?
- In 2024, CMS data shows 856 Original Medicare patients and 1,723 services for Gregory F. Zink. This counts Original Medicare only and measures volume, not quality.
- What is Gregory F. Zink's NPI number?
- 1144232794. 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 Gregory F. Zink, 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 | 856 |
|---|---|
| Services billed to Medicare | 1,723 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)757 services
- Imaging of retina (92134)244 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)182 services
- Imaging of optic nerve (92133)119 services
- Exam of visual field with extended testing (92083)110 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 blood pressure75%
- High cholesterol74%
- Arthritis46%
- Diabetes31%
- Ischemic heart disease26%
- Anxiety22%
Hospitals where Gregory F. Zink works
Medicare's Facility Affiliation Data lists Gregory F. Zink at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Kosciusko Community HospitalWarsaw, IN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 150133
- Parkview Whitley HospitalColumbia City, IN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 150101
Practice locations
Addresses where Gregory F. Zink is enrolled with Medicare (CMS data updated October 2, 2026).
- 2251 Dubois DrWarsaw, IN 46580 (574) 269‑2777
- 4330 Edison Lakes Pkwy, Suite AMishawaka, IN 46545 (574) 271‑0120
Group practices
Medicare enrollment lists Gregory F. Zink as a member of this group (CMS data updated October 2, 2026).
- Grossnickle Eye Center Inc12 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Warsaw
Clinicians with the same Medicare primary specialty in Warsaw, IN — not a recommendation.
Other clinicians in Grossnickle Eye Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Indiana University - School Of Optometry |
| Graduation year | 1994 (32 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144232794 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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