Ronac Mamtani, MD
Medical Oncology · Philadelphia, PANPI 1487811964
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $53,505 of the $61,120 with a category attached, or 87.5%. 9 manufacturers reported payments, led by Merck at 50.3% of the total. 2025 is the largest year on record at $19,868, 2.8 times the $7,049 reported in 2019.
Across 34 payments — averaging $1797.66 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$31K
- Seagen Inc.$17K
- E.r. Squibb & Sons, L.L.C.$10K
- Astellas Pharma US Inc$2K
- Astellas Pharma Global Development$2K
- Pfizer$96
- plus $111 from 3 others
Across 59 payments — averaging $11,106 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$271K
- Astellas Pharma Global Development$228K
- Merck$156K
What the payments were for
- Consulting fees$53,50588%
- Speaking & faculty fees$5,6709%
- Travel & lodging$1,1132%
- Food & beverage$7331%
- Education$990%
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 |
|---|---|---|
| Merck | 9 | $30,746 |
| Seagen Inc. | 16 | $16,959 |
| E.r. Squibb & Sons, L.L.C. | 1 | $9,810 |
| Astellas Pharma US Inc | 2 | $1,860 |
| Astellas Pharma Global Development | 2 | $1,538 |
| Pfizer | 1 | $96 |
| Eli Lilly | 1 | $60 |
| Novo Nordisk | 1 | $32 |
| EMD Serono, Inc. | 1 | $19 |
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
$61,120 in reported general payments places this provider in the 85th percentile of 238 medical oncology providers in Pennsylvania.
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.
Other medical oncology in Philadelphia
- Carl JunePhiladelphia$9M
- Shayma KazmiPhiladelphia$619K
- Marcia BrosePhiladelphia$260K
- Adam CohenPhiladelphia$239K
- Daniel HallerPhiladelphia$227K
- Edith MitchellPhiladelphia$220K
- Elizabeth PlimackPhiladelphia$190K
- Alexander PerlPhiladelphia$176K
- Martin EdelmanPhiladelphia$157K
- Jean-Pierre IssaPhiladelphia$147K
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.