David Charman, MD
Internal Medicine · Buffalo Grove, ILNPI 1346228954
Payments from drug & device makers
Across 296 payments — averaging $27.26 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$3K
- Pfizer$892
- Amgen$859
- Novo Nordisk$634
- Lilly USA, LLC$560
- AstraZeneca$339
- plus $2K from 29 others
What the payments were for
- Consulting fees$2,00025%
- Food & beverage$6,06975%
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) | 36 | $2,705 |
| Pfizer | 35 | $892 |
| Amgen | 42 | $859 |
| Novo Nordisk | 31 | $634 |
| Lilly USA, LLC | 26 | $560 |
| AstraZeneca | 19 | $339 |
| Takeda Pharmaceuticals U.S.A., Inc. | 14 | $241 |
| Esperion Therapeutics, Inc. | 12 | $229 |
| Johnson & Johnson | 8 | $169 |
| Axsome Therapeutics, Inc. | 6 | $148 |
| Idorsia Pharmaceuticals US Inc | 6 | $109 |
| Amarin Pharma, Inc. | 5 | $106 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 6 | $106 |
| Exact Sciences | 5 | $104 |
| E.r. Squibb & Sons, L.L.C. | 5 | $97 |
| Boehringer Ingelheim | 4 | $92 |
| GSK | 5 | $90 |
| Biohaven Pharmaceuticals, Inc. | 4 | $86 |
| Biohaven Pharmaceutical Holding Company Ltd. | 4 | $77 |
| Novartis | 4 | $71 |
| Azurity Pharmaceuticals, Inc. | 2 | $44 |
| Regeneron Healthcare Solutions, Inc. | 2 | $40 |
| Abbott | 2 | $37 |
| Corcept Therapeutics | 1 | $36 |
| Ironwood Pharmaceuticals, Inc | 2 | $27 |
| Sanofi-aventis U.S. LLC | 1 | $22 |
| Edwards Lifesciences | 1 | $22 |
| Collegium Pharmaceutical, Inc. | 1 | $20 |
| Currax Pharmaceuticals LLC | 1 | $17 |
| Metuchen Pharmaceuticals | 1 | $17 |
| Shire North American Group Inc | 1 | $16 |
| IBSA Pharma Inc. | 1 | $15 |
| Teva Pharmaceuticals USA, Inc. | 1 | $14 |
| Mannkind Corporation | 1 | $14 |
| Arbor Pharmaceuticals, Inc. | 1 | $12 |
How this compares
$8,069 in reported general payments places this provider in the 90th percentile of 5,182 internal medicine 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 |
|---|---|---|
| MounjaroTirzepatide | 62 | $75,926 |
| OzempicSemaglutide | 40 | $41,594 |
| EliquisApixaban | 16 | $22,810 |
| Rosuvastatin Calcium | 193 | $2,658 |
| Atorvastatin Calcium | 141 | $1,999 |
| Levothyroxine Sodium | 141 | $1,876 |
| SynthroidLevothyroxine Sodium | 21 | $1,847 |
| Losartan Potassium | 144 | $1,770 |
| Escitalopram Oxalate | 66 | $1,640 |
| Amlodipine Besylate | 129 | $1,570 |
| Memantine Hcl ErMemantine Hcl | 14 | $1,247 |
| Pantoprazole Sodium | 64 | $1,163 |
| Metoprolol Succinate | 68 | $1,084 |
| Nitroglycerin | 13 | $1,056 |
| Hydralazine Hcl | 21 | $942 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Lilly USA, LLCMounjaro | $560 | $75,92662 claims |
| Novo NordiskOzempic | $634 | $41,59440 claims |
| PfizerEliquis | $892 | $22,81016 claims |
| AbbVieSynthroid | $2,705 | $1,84721 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 90th percentile of 5,182 internal medicine providers in Illinois.
Other internal medicine in Buffalo Grove
- Dennis LevinsonChicago$25.3M
- Mary BrownRockford$16M
- Andrew BartlettChampaign$4.1M
- Danny SugimotoChicago$4M
- Peter O DonnellChicago$3.9M
- Daniel CatenacciChicago$3.5M
- Jeffrey GeohasEvanston$2.3M
- Patricia WalshChicago$2.1M
- Merle DiamondChicago$1.7M
- Yoko MomoyamaLombard$1.6M
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.