Warren Kammerer, MD
Psychiatry · Park Ridge, ILNPI 1134236565
Payments from drug & device makers
Across 238 payments — averaging $19.39 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$978
- Sunovion Pharmaceuticals Inc.$658
- Lundbeck LLC$621
- Otsuka America Pharmaceutical, Inc.$565
- Takeda Pharmaceuticals U.S.A., Inc.$401
- Bausch Health US, LLC$292
- plus $1K from 16 others
What the payments were for
- Speaking & faculty fees$200%
- Food & beverage$4,596100%
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 |
|---|---|---|
| AbbVie(2 entities) | 42 | $978 |
| Sunovion Pharmaceuticals Inc. | 37 | $658 |
| Lundbeck LLC | 39 | $621 |
| Otsuka America Pharmaceutical, Inc. | 26 | $565 |
| Takeda Pharmaceuticals U.S.A., Inc. | 22 | $401 |
| Bausch Health US, LLC | 16 | $292 |
| Johnson & Johnson | 10 | $251 |
| Axsome Therapeutics, Inc. | 8 | $182 |
| Merck | 11 | $172 |
| Shire North American Group Inc | 5 | $91 |
| Alkermes, Inc. | 4 | $79 |
| Idorsia Pharmaceuticals US Inc | 3 | $67 |
| Teva Pharmaceuticals USA, Inc. | 2 | $51 |
| Alfasigma USA, Inc. | 3 | $42 |
| Vanda Pharmaceuticals Inc. | 2 | $36 |
| Eisai Inc. | 2 | $35 |
| Sanofi-aventis U.S. LLC | 1 | $20 |
| Noven Therapeutics, LLC | 1 | $20 |
| Jazz Pharmaceuticals Inc. | 1 | $15 |
| Neos Therapeutics, LP | 1 | $14 |
| Vertical Pharmaceuticals, LLC | 1 | $13 |
| Ironshore Pharmaceuticals Inc. | 1 | $13 |
How this compares
$4,616 in reported general payments places this provider in the 85th percentile of 1,344 psychiatry 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 |
|---|---|---|
| LithobidLithium Carbonate | 11 | $12,514 |
| Duloxetine Hcl | 95 | $2,591 |
| Vilazodone Hcl | 14 | $1,334 |
| Clozapine | 55 | $1,279 |
| Venlafaxine Hcl ErVenlafaxine Hcl | 74 | $1,183 |
| Divalproex Sodium ErDivalproex Sodium | 29 | $1,135 |
| Quetiapine Fumarate ErQuetiapine Fumarate | 31 | $1,078 |
| Alprazolam | 96 | $850 |
| Clonazepam | 64 | $702 |
| Quetiapine Fumarate | 70 | $646 |
| Dextroamphetamine-Amphet ErDextroamphetamine/Amphetamine | 22 | $545 |
| Bupropion Hcl | 24 | $534 |
| Ziprasidone Hcl | 20 | $533 |
| Olanzapine | 22 | $490 |
| Perphenazine | 11 | $454 |
Paid to pharmacies, not to this prescriber.
Other psychiatry in Park Ridge
- Jeffrey RossNorthbrook$10.8M
- Yuhwen ChowChicago$8.5M
- Mark LermanNorthbrook$4.5M
- Danesh AlamWinfield$2.7M
- John ZajeckaSkokie$2.5M
- Riaz BaberNaperville$2.4M
- Michael GreenbaumLibertyville$2.2M
- Sandeep GaonkarNaperville$1.8M
- Jon GrantChicago$1.4M
- David KempOak Lawn$1.4M
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.