Michael Grassi, MD
Ophthalmology · Naperville, ILNPI 1689666885
Payments from drug & device makers
Across 1 payment — averaging $46.80 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Genentech USA, Inc.$47
What the payments were for
- Education$47100%
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 |
|---|---|---|
| Genentech USA, Inc. | 1 | $47 |
How this compares
$47 in reported general payments places this provider in the 5th percentile of 773 ophthalmology providers in Illinois.
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 |
|---|---|---|
| Brimonidine Tartrate | 11 | $1,201 |
| Prednisolone Acetate | 25 | $938 |
| Dorzolamide Hcl | 74 | $814 |
| Ketorolac Tromethamine | 16 | $551 |
Paid to pharmacies, not to this prescriber.
Other ophthalmology in Naperville
- Veeral ShethOak Forest$14.8M
- Seenu HariprasadChicago$2.3M
- Lisa NijmSpringfield$1.9M
- Manjot GillChicago$1.4M
- Mitchell JacksonLake Villa$1.4M
- Ramanath BhandariSpringfield$1.2M
- Kathleen MornoNorth Riverside$1.2M
- Amani FawziChicago$864K
- Navaneet Chailert BorisuthRock Island$737K
- David LubeckHomewood$709K
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.