Ren Yu Zhang, MD
Colon & Rectal Surgery · Las Vegas, NVNPI 1902910052
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $6,300 of the $8,322 with a category attached, or 75.7%. Johnson & Johnson accounts for 75.8% of it on its own, with 10 other manufacturers making up the rest. Reporting peaked in 2024 at $7,241 and has fallen 98.8% since, to $84 in 2025.
Across 34 payments — averaging $244.75 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Johnson & Johnson$6K
- Medical Device Business Services, Inc.$896
- Intuitive Surgical$729
- Aroa Biosurgery Incorporated$84
- Merck$77
- Boston Scientific$62
- plus $164 from 5 others
What the payments were for
- Consulting fees$6,30076%
- Travel & lodging$1,32816%
- Food & beverage$6948%
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 |
|---|---|---|
| Johnson & Johnson | 2 | $6,308 |
| Medical Device Business Services, Inc. | 7 | $896 |
| Intuitive Surgical | 6 | $729 |
| Aroa Biosurgery Incorporated | 3 | $84 |
| Merck | 5 | $77 |
| Boston Scientific | 2 | $62 |
| Novo Nordisk | 2 | $46 |
| Clovis Oncology, Inc. | 4 | $46 |
| La Jolla Pharmaceutical Company | 1 | $36 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $33 |
| Biocomposites Inc | 1 | $4 |
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.
- Harmonic$823
- Da Vinci Surgical System$673
How this compares
Too few colon & rectal surgery providers in Nevadato place this figure against a meaningful peer group, so we don't.
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 |
|---|---|---|
| Oxycodone-AcetaminophenOxycodone Hcl/Acetaminophen | 92 | $1,272 |
| Hydromorphone Hcl | 12 | $304 |
| Metronidazole | 24 | $144 |
| Neomycin Sulfate | 13 | $21 |
Paid to pharmacies, not to this prescriber.
Other colon & rectal surgery in Las Vegas
- Garrett FriedmanLas Vegas$1.2M
- Roger HsiungLas Vegas$44K
- Ketan ThankiLas Vegas$7K
- Calvin LyonsLas Vegas$6K
- Melissa MilesLas Vegas$5K
- Joseph ThorntonLas Vegas$5K
- Lance HornerLas Vegas$5K
- Katherine SpechtLas Vegas$4K
- Stephanie WishnevLas Vegas$829
- Kent SasseReno$44K
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.