Sreenivasa Nattam, MD
Hematology & Oncology · Fort Wayne, INNPI 1982606893
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (53.8%), consulting fees and food and beverage — rather than concentrated in one kind of arrangement. 60 manufacturers reported payments, led by Cornerstone Specialty Network LLC at 29.1% of the total. Reporting peaked in 2022 at $41,167 and has fallen 80.6% since, to $7,983 in 2025. Among hematology & oncology clinicians in IN with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 676 payments — averaging $176.83 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Cornerstone Specialty Network LLC$35K
- Takeda Pharmaceuticals U.S.A., Inc.$33K
- Daiichi Sankyo Inc.$10K
- Gilead$8K
- AstraZeneca$6K
- Seagen Inc.$5K
- plus $24K from 54 others
Across 7 payments — averaging $370.75 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.
- Takeda Pharmaceuticals U.S.A., Inc.$3K
What the payments were for
- Consulting fees$25,37821%
- Speaking & faculty fees$64,33454%
- Travel & lodging$10,2239%
- Food & beverage$15,80613%
- Education$6831%
- Other$3,1143%
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.
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
$119,537 in reported general payments places this provider in the 90th percentile of 224 hematology & oncology providers in Indiana.
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 |
|---|---|---|
| ImbruvicaIbrutinib | 46 | $744,651 |
| RevlimidLenalidomide | 38 | $694,214 |
| CalquenceAcalabrutinib Maleate | 39 | $589,425 |
| SprycelDasatinib | 22 | $385,929 |
| BrukinsaZanubrutinib | 26 | $377,044 |
| TagrissoOsimertinib Mesylate | 22 | $363,208 |
| IbrancePalbociclib | 21 | $310,038 |
| BosulifBosutinib | 14 | $268,497 |
| LynparzaOlaparib | 16 | $259,503 |
| VenclextaVenetoclax | 15 | $218,087 |
| PromactaEltrombopag Olamine | 12 | $157,189 |
| EliquisApixaban | 103 | $84,460 |
| XareltoRivaroxaban | 40 | $47,378 |
| Imatinib Mesylate | 17 | $37,703 |
| Abiraterone Acetate | 40 | $9,326 |
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 |
|---|---|---|
| AstraZenecaCalquence, Tagrisso, Lynparza | $5,785 | $1,212,13677 claims |
| Pharmacyclics LLC, An Abbvie CompanyImbruvica | $317 | $744,65146 claims |
| Bristol Myers SquibbRevlimid | $321 | $694,21438 claims |
| PfizerIbrance, Bosulif, Eliquis | $1,986 | $662,995138 claims |
| E.r. Squibb & Sons, L.L.C.Sprycel | $2,875 | $385,92922 claims |
| Beigene USA, Inc.Brukinsa | $247 | $377,04426 claims |
| AbbVieVenclexta | $546 | $218,08715 claims |
| NovartisPromacta | $3,975 | $157,18912 claims |
| Johnson & JohnsonXarelto | $1,991 | $47,37840 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 224 hematology & oncology providers in Indiana.
Other hematology & oncology in Fort Wayne
- Ahad SadiqFort Wayne$430K
- Zhentao ZhangFort Wayne$167K
- Praveen KolliparaFort Wayne$88K
- Dolly Quispe LeveauFort Wayne$74K
- Matthew CarrFort Wayne$51K
- Shalini ChitneniFort Wayne$46K
- Ryan GonzalesFort Wayne$38K
- Robert MangesFort Wayne$31K
- Michael TooleFort Wayne$27K
- Melanie ClarkFort Wayne$23K
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.