Robert Chooljian Gunzenhauser, MD
NPI 1457988065ActiveIndividual· Ophthalmology· Upland, CA
Ophthalmology (MD) in Upland, California, trained at Wake Forest University School of Medicine (class of 2020). Their prescriptions cost Medicare Part D more than their services did: $130,635 for 1,442 claims, against $24,272 paid for services in 2024. Alcon Vision LLC was the largest of 4 companies reporting payments in 2025, $567.52 in all, mostly food and beverage.
Overview
| NPI | 1457988065 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 24, 2020 |
| Last updated in NPPES | Jul 21, 2026 |
| Certified by provider | Jul 21, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | A189179 | CA |
| Ophthalmology, Glaucoma Specialist | 207WX0009X | A189179 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 194 |
|---|---|
| Services billed | 264 across 22 procedure codes |
| Paid by Medicare | $24,272 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,442 · 2,536 30-day fills |
|---|---|
| Patients | 598 |
| Total drug cost | $130,635 |
| Generic share | 61% of claims |
Education and affiliations
| Medical school | Wake Forest University School of Medicine |
|---|---|
| Graduation year | 2020 |
| Medicare specialty | Ophthalmology |
Medical group
- Marc H Shomer MD PHD IncUpland, CA · 2 clinicians
Industry payments (Open Payments)
- 2025$567.52 · 13 payments from 4 companies
- 2024$325.42 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $249.18 | 7 |
| Sight Sciences, Inc. | $158.68 | 4 |
| Nova Eye, Inc. | $137.68 | 1 |
| Thea Pharma Inc. | $21.98 | 1 |
What the 2025 payments were for
- Food and Beverage$567.52 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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