Maria Gregory, MD
Neurology · Las Vegas, NVNPI 1639148596
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $11,745 of the $13,282 with a category attached, or 88.4%. It is spread thinly across 44 manufacturers, the largest accounting for just 16.1% — the pattern of someone who eats at a lot of different presentations. Reporting peaked in 2023 at $3,903 and has fallen 59.9% since, to $1,564 in 2025.
Across 458 payments — averaging $29.00 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- EMD Serono, Inc.$2K
- Biogen$1K
- AstraZeneca$1K
- UCB, Inc.$866
- Novartis$833
- Amgen$819
- plus $6K from 38 others
What the payments were for
- Consulting fees$1,37510%
- Food & beverage$11,74588%
- Education$1621%
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.
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
$13,282 in reported general payments places this provider in the 75th percentile of 145 neurology providers in Nevada.
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 |
|---|---|---|
| Memantine Hcl | 29 | $1,001 |
| Donepezil Hcl | 42 | $426 |
| Sumatriptan Succinate | 14 | $95 |
| Doxepin Hcl | 11 | $93 |
Paid to pharmacies, not to this prescriber.
Other neurology in Las Vegas
- Zoltan MariLas Vegas$629K
- Fan ZhangLas Vegas$398K
- le HuaLas Vegas$385K
- Mehdi AnsariniaLas Vegas$306K
- Carrie HershLas Vegas$209K
- Shanker DixitLas Vegas$137K
- Charles KamenLas Vegas$124K
- Toya MaloneLas Vegas$123K
- Nicole TheuvenetLas Vegas$120K
- Kevin XieLas Vegas$46K
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.