Mark Walsh, PhD
Retina Specialist · Tucson, AZNPI 1003952318
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 99.4% of the total across 86 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 20 manufacturers reported payments, led by Alcon at 36.3% of the total. Reporting peaked in 2019 at $1,995 and has fallen 72.4% since, to $551 in 2025. That places this record below the midpoint for retina specialist clinicians in AZ, where the typical reported total is $12,789.
Across 86 payments — averaging $72.86 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Alcon$2K
- Novartis$815
- Alimera Sciences, Inc.$525
- Regeneron Healthcare Solutions, Inc.$460
- Genentech USA, Inc.$422
- Apellis Pharmaceuticals, Inc.$356
- plus $1K from 14 others
Across 3 payments — averaging $3439.17 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- AbbVie$10K
What the payments were for
- Food & beverage$6,22799%
- Gifts$391%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Alcon | 18 | $2,273 |
| Novartis | 8 | $815 |
| Alimera Sciences, Inc. | 6 | $525 |
| Regeneron Healthcare Solutions, Inc. | 8 | $460 |
| Genentech USA, Inc. | 13 | $422 |
| Apellis Pharmaceuticals, Inc. | 6 | $356 |
| AbbVie(2 entities) | 6 | $315 |
| Aerie Pharmaceuticals, Inc. | 3 | $261 |
| Mallinckrodt Hospital Products Inc. | 1 | $146 |
| Glaukos Corporation | 1 | $130 |
| Kala Pharmaceuticals, Inc. | 1 | $125 |
| Genentech, Inc. | 3 | $107 |
| Astellas Pharma US Inc | 3 | $83 |
| Carl Zeiss Meditec, Inc. | 1 | $70 |
| Bausch & Lomb Americas Inc. | 2 | $47 |
| Carl Zeiss Meditec AG | 2 | $39 |
| Coherus Oncology, Inc. | 1 | $30 |
| Harrow Eye, LLC | 1 | $28 |
| Spark Therapeutics, Inc. | 1 | $20 |
| ANI Pharmaceuticals, Inc. | 1 | $16 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$6,266 in reported general payments places this provider in the 35th percentile of 30 retina specialist providers in Arizona.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Prednisolone Acetate | 308 | $15,858 |
| Difluprednate | 37 | $4,590 |
| Ketorolac Tromethamine | 120 | $3,081 |
| Bromfenac Sodium | 15 | $2,673 |
| Neomycin-Polymyxin-DexamethNeomycin/Polymyxin B/Dexametha | 158 | $1,984 |
| Dorzolamide Hcl | 34 | $617 |
| Atropine Sulfate | 14 | $613 |
| Brimonidine Tartrate | 55 | $394 |
| Timolol Maleate | 12 | $125 |
| Latanoprost | 17 | $91 |
Paid to pharmacies, not to this prescriber.
Other retina specialist in Tucson
- Anthony JosephTucson$21K
- Diego CalonjeTucson$16K
- Igor KozakTucson$8K
- Ryan WongTucson$5K
- Cameron JavidTucson$4K
- April HarrisTucson$4K
- Jane ChoTucson$2K
- George NovalisTucson$129
- Egbert SaavedraTucson$85
- Jordan GraffPhoenix$483K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.