Gregorio Guillen, MD
Geriatric Medicine · Perth Amboy, NJNPI 1538252226
Payments from drug & device makers
Across 560 payments — averaging $14.99 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$1K
- Bayer$823
- GSK$753
- Boehringer Ingelheim$736
- AbbVie$712
- Novo Nordisk$693
- plus $4K from 34 others
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 |
|---|---|---|
| AstraZeneca | 59 | $1,031 |
| Bayer | 43 | $823 |
| GSK | 54 | $753 |
| Boehringer Ingelheim | 52 | $736 |
| AbbVie(2 entities) | 50 | $712 |
| Novo Nordisk | 53 | $693 |
| Amgen | 36 | $526 |
| Novartis | 33 | $470 |
| Pfizer | 19 | $266 |
| Lilly USA, LLC | 18 | $265 |
| Johnson & Johnson | 18 | $242 |
| Exact Sciences | 10 | $203 |
| Corcept Therapeutics | 15 | $193 |
| Amarin Pharma, Inc. | 13 | $185 |
| Ironwood Pharmaceuticals, Inc | 9 | $156 |
| Sanofi-aventis U.S. LLC | 11 | $155 |
| Merck | 10 | $138 |
| Eisai Inc. | 7 | $131 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 9 | $129 |
| Lundbeck LLC | 5 | $78 |
| Ardelyx, Inc. | 4 | $63 |
| Mylan Specialty L.p. | 4 | $62 |
| Takeda Pharmaceuticals U.S.A., Inc. | 6 | $57 |
| Abbott | 3 | $48 |
| Radius Health, Inc. | 2 | $30 |
| Mannkind Corporation | 2 | $29 |
| Nestle Healthcare Nutrition Inc. | 2 | $28 |
| Dexcom, Inc. | 1 | $23 |
| Otsuka America Pharmaceutical, Inc. | 1 | $18 |
| Neurocrine Biosciences, Inc. | 1 | $15 |
| Amphastar Pharmaceuticals, Inc. | 1 | $15 |
| Biogen | 1 | $14 |
| Xeris Pharmaceuticals, Inc. | 1 | $14 |
| BD | 1 | $14 |
| Astellas Pharma US Inc | 1 | $14 |
| Seqirus USA Inc | 1 | $14 |
| Azurity Pharmaceuticals, Inc. | 1 | $14 |
| Ultragenyx Pharmaceutical Inc. | 1 | $14 |
| Scilex Pharmaceuticals Inc. | 1 | $13 |
| Teva Pharmaceuticals USA, Inc. | 1 | $11 |
How this compares
$8,394 in reported general payments places this provider in the 95th percentile of 165 geriatric medicine providers in New Jersey.
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.
Other geriatric medicine in Perth Amboy
- Isao IwataPlainsboro$783K
- Albert RiddleHaworth$524K
- Joshua Shua HaimManchester$192K
- Gamil MakarClifton$82K
- Pradip ShahWest Caldwell$27K
- Ketankumar VaidyaEdison$8K
- Cheng-An MaoClifton$8K
- Theresa RedlingLivingston$7K
- Sarita RastogiHackensack$7K
- Leslie FeiginDenville$7K
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.