Mark Vlasak, MD
Internal Medicine · Collierville, TNNPI 1356341762
Payments from drug & device makers
Across 23 payments — averaging $18.72 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Biohaven Pharmaceuticals, Inc.$118
- Teva Pharmaceuticals USA, Inc.$68
- Esperion Therapeutics, Inc.$61
- Lilly USA, LLC$57
- AbbVie$51
- Kowa Pharmaceuticals America, Inc.$26
- plus $50 from 3 others
Across 10 payments — averaging $13,100 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Eli Lilly$131K
What the payments were for
- Food & beverage$430100%
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 |
|---|---|---|
| Biohaven Pharmaceuticals, Inc. | 3 | $118 |
| Teva Pharmaceuticals USA, Inc. | 4 | $68 |
| Esperion Therapeutics, Inc. | 3 | $61 |
| Lilly USA, LLC | 4 | $57 |
| AbbVie | 4 | $51 |
| Kowa Pharmaceuticals America, Inc. | 2 | $26 |
| AstraZeneca | 1 | $18 |
| Clarus Therapeutics Inc. | 1 | $18 |
| Amarin Pharma, Inc. | 1 | $15 |
How this compares
$430 in reported general payments places this provider in the 55th percentile of 2,216 internal medicine providers in Tennessee.
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 | 53 | $63,030 |
| JardianceEmpagliflozin | 44 | $55,291 |
| JanuviaSitagliptin Phosphate | 48 | $53,986 |
| EliquisApixaban | 30 | $28,401 |
| OzempicSemaglutide | 29 | $26,450 |
| TrulicityDulaglutide | 19 | $20,303 |
| Synjardy XrEmpagliflozin/Metformin Hcl | 12 | $17,105 |
| MyrbetriqMirabegron | 18 | $12,981 |
| Toujeo SolostarInsulin Glargine,hum.Rec.Anlog | 15 | $7,061 |
| TradjentaLinagliptin | 12 | $5,266 |
| Tiotropium Bromide | 11 | $4,261 |
| SynthroidLevothyroxine Sodium | 37 | $3,039 |
| Duloxetine Hcl | 79 | $2,693 |
| Colestipol Hcl | 18 | $2,356 |
| Levothyroxine Sodium | 251 | $2,216 |
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, Trulicity | $57 | $83,33372 claims |
| AbbVieSynthroid | $51 | $3,03937 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 55th percentile of 2,216 internal medicine providers in Tennessee.
Other internal medicine in Collierville
- Henry StampsCollierville$161K
- Gina HanissianCollierville$25K
- Mark McKenzieChattanooga$11.9M
- Bernard GrunstraBristol$6.4M
- Jewel WhiteKingsport$5.7M
- Judith WhiteKingsport$5.6M
- Obadias MarquezOoltewah$2.8M
- Amanda Moore MillerKnoxville$2.3M
- Rick WhilesBristol$1.5M
- John AndersonNashville$1.5M
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.