Rafael Canadas Zizzias, MD
Internal Medicine · Dallas, TXNPI 1801897616
Payments from drug & device makers
Across 377 payments — averaging $1069.53 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Eli Lilly$139K
- Bayer$116K
- Novo Nordisk AS$95K
- Pfizer$49K
- Novo Nordisk$688
- Lilly USA, LLC$479
- plus $3K from 29 others
Across 2 payments — averaging $640.13 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$1K
What the payments were for
- Travel & lodging$2,47535%
- Food & beverage$4,59365%
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 |
|---|---|---|
| Eli Lilly | 26 | $139,410 |
| Bayer | 60 | $115,916 |
| Novo Nordisk AS | 45 | $95,148 |
| Pfizer | 13 | $48,791 |
| Novo Nordisk | 44 | $688 |
| Lilly USA, LLC | 33 | $479 |
| Amgen | 22 | $386 |
| GSK | 18 | $304 |
| Boehringer Ingelheim | 15 | $285 |
| Merck | 16 | $271 |
| Sanofi-aventis U.S. LLC | 12 | $186 |
| AbbVie(2 entities) | 10 | $164 |
| AstraZeneca | 10 | $156 |
| Amarin Pharma, Inc. | 8 | $145 |
| Bardy Diagnostics, Inc. | 1 | $135 |
| Abbott | 5 | $108 |
| Novartis | 7 | $104 |
| Renalytix AI, Inc. | 5 | $82 |
| Exact Sciences | 4 | $69 |
| Astellas Pharma US Inc | 3 | $53 |
| Corcept Therapeutics | 2 | $39 |
| Otsuka America Pharmaceutical, Inc. | 2 | $39 |
| Shield Therapeutics Inc | 2 | $34 |
| Esperion Therapeutics, Inc. | 2 | $34 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 2 | $30 |
| Dexcom, Inc. | 1 | $24 |
| Edwards Lifesciences | 1 | $19 |
| Ironwood Pharmaceuticals, Inc | 1 | $16 |
| Optos, Inc. | 1 | $16 |
| Mannkind Corporation | 1 | $15 |
| Phathom Pharmaceuticals, Inc. | 1 | $15 |
| Eisai Inc. | 1 | $14 |
| Kowa Pharmaceuticals America, Inc. | 1 | $13 |
| Bristol Myers Squibb | 1 | $13 |
| Evoke Pharma, Inc. | 1 | $12 |
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
$403,212 in reported general payments places this provider in the 95th percentile of 7,675 internal medicine providers in Texas.
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 |
|---|---|---|
| OzempicSemaglutide | 72 | $105,528 |
| FarxigaDapagliflozin Propanediol | 79 | $99,581 |
| EliquisApixaban | 67 | $78,158 |
| JardianceEmpagliflozin | 42 | $61,074 |
| Trelegy ElliptaFluticasone/Umeclidin/Vilanter | 44 | $53,851 |
| ProliaDenosumab | 30 | $51,844 |
| LinzessLinaclotide | 37 | $43,198 |
| Tresiba Flextouch U-200Insulin Degludec | 24 | $32,141 |
| MounjaroTirzepatide | 20 | $29,143 |
| JanuviaSitagliptin Phosphate | 16 | $24,593 |
| MyrbetriqMirabegron | 25 | $23,942 |
| Breztri AerosphereBudesonide/Glycopyr/Formoterol | 19 | $21,099 |
| EntrestoSacubitril/Valsartan | 18 | $19,564 |
| XareltoRivaroxaban | 12 | $19,201 |
| Toujeo Max SolostarInsulin Glargine,hum.Rec.Anlog | 19 | $18,396 |
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 |
|---|---|---|
| AstraZenecaFarxiga, Breztri Aerosphere | $156 | $120,68198 claims |
| Novo NordiskOzempic | $688 | $105,52872 claims |
| PfizerEliquis | $48,791 | $78,15867 claims |
| Boehringer IngelheimJardiance | $285 | $61,07442 claims |
| GSKTrelegy Ellipta | $304 | $53,85144 claims |
| AmgenProlia | $386 | $51,84430 claims |
| Lilly USA, LLCMounjaro, Trulicity | $479 | $46,10034 claims |
| AbbVieLinzess | $164 | $43,19837 claims |
| MerckJanuvia, Janumet | $271 | $42,34132 claims |
| Astellas Pharma US IncMyrbetriq | $53 | $23,94225 claims |
| NovartisEntresto | $104 | $19,56418 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 95th percentile of 7,675 internal medicine providers in Texas.
Other internal medicine in Dallas
- Amit VermaDallas$7.7M
- Valentine EbuhDallas$6.8M
- Gary SinclairDallas$3.4M
- Jan BurgerHouston$47.3M
- Nitin JainHouston$33.2M
- Muhammad IrfanTomball$30.6M
- Aung NaingHouston$30.6M
- Robert BassSan Antonio$25.6M
- Preetesh JainHouston$19.5M
- Paolo StratiHouston$19.2M
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.