Sam Chang, MD
Urology · Nashville, TNNPI 1922107358
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $161,903 of the $197,845 with a category attached, or 81.8%. 24 manufacturers reported payments, led by Urogen Pharma, Inc. at 54.5% of the total. 2025 is the largest year on record at $130,408, more than ten times the $9,411 reported in 2019. Among urology clinicians in TN with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 177 payments — averaging $1117.77 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Urogen Pharma, Inc.$108K
- Johnson & Johnson$19K
- Merck$16K
- Janssen Research & Development, LLC$9K
- Progenics Pharmaceuticals, Inc.$8K
- Immunitybio, Inc.$8K
- plus $29K from 18 others
Across 25 payments — averaging $10,523 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.
- Janssen Research & Development, LLC$263K
What the payments were for
- Consulting fees$161,90382%
- Speaking & faculty fees$18,3889%
- Travel & lodging$8,6154%
- Food & beverage$8,9335%
- Education$70%
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 |
|---|---|---|
| Urogen Pharma, Inc. | 56 | $107,923 |
| Johnson & Johnson(2 entities) | 35 | $18,875 |
| Merck | 13 | $16,269 |
| Janssen Research & Development, LLC | 7 | $9,368 |
| Progenics Pharmaceuticals, Inc. | 6 | $8,496 |
| Immunitybio, Inc. | 5 | $8,034 |
| Photocure Inc | 15 | $6,619 |
| Telix Pharmaceuticals | 2 | $4,638 |
| Janssen Scientific Affairs, LLC | 5 | $4,512 |
| Pfizer | 2 | $3,516 |
| Ferring Pharmaceuticals Inc. | 8 | $3,356 |
| Astellas Pharma Global Development | 1 | $1,755 |
| Provepharm Inc. | 2 | $1,607 |
| Janssen Global Services, LLC | 3 | $1,050 |
| Bayer | 5 | $516 |
| Genentech, Inc. | 1 | $353 |
| KARL Storz Endoscopy-america | 3 | $222 |
| Clovis Oncology, Inc. | 2 | $140 |
| Sanofi | 1 | $121 |
| Myovant Sciences Inc. | 1 | $108 |
| Comsort, Inc | 1 | $100 |
| Angiodynamics, Inc. | 1 | $97 |
| EMD Serono, Inc. | 1 | $87 |
| Seagen Inc. | 1 | $83 |
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
$197,845 in reported general payments places this provider in the 95th percentile of 276 urology 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 |
|---|---|---|
| Tamsulosin Hcl | 78 | $1,527 |
| Finasteride | 34 | $699 |
| Trospium Chloride | 13 | $518 |
| Peg 3350-ElectrolyteSodium Chloride/Nahco3/Kcl/Peg | 11 | $189 |
Paid to pharmacies, not to this prescriber.
Other urology in Nashville
- L KnollNashville$2.1M
- Gautam JayramNashville$1M
- Roger DmochowskiNashville$763K
- Ashley TapscottNashville$425K
- Raoul ConcepcionNashville$339K
- Melissa KaufmanNashville$312K
- Benjamin DehnerNashville$165K
- Smita deNashville$100K
- Nicole MillerNashville$73K
- Kelvin MosesNashville$67K
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.