Alda Tam, MD
Diagnostic Radiology · Houston, TXNPI 1649283250
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (46.0%), speaking fees and travel and lodging — rather than concentrated in one kind of arrangement. 14 manufacturers reported payments, led by Boston Scientific at 54.1% of the total. Reporting peaked in 2019 at $18,192 and has fallen 88.8% since, to $2,047 in 2025. Among diagnostic radiology clinicians in TX 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 59 payments — averaging $458.32 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Boston Scientific$15K
- Varian Medical Systems, Inc.$6K
- Cook Incorporated$2K
- Astrazeneca UK Limited$1K
- Guerbet LLC$1K
- Siemens Medical Solutions USA, Inc.$1K
- plus $676 from 8 others
Across 6 payments — averaging $178,287 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.
- Boston Scientific$925K
- Guerbet LLC$145K
What the payments were for
- Consulting fees$12,44346%
- Speaking & faculty fees$7,80029%
- Travel & lodging$3,57113%
- Food & beverage$3,22712%
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 |
|---|---|---|
| Boston Scientific | 28 | $14,634 |
| Varian Medical Systems, Inc. | 4 | $6,175 |
| Cook Incorporated | 1 | $1,800 |
| Astrazeneca UK Limited | 1 | $1,343 |
| Guerbet LLC | 4 | $1,303 |
| Siemens Medical Solutions USA, Inc. | 11 | $1,110 |
| Endocare, Inc. | 3 | $194 |
| Sirtex Medical Inc | 1 | $165 |
| Johnson & Johnson | 1 | $109 |
| Stryker | 1 | $85 |
| Cook Medical LLC | 1 | $75 |
| Inari Medical, Inc. | 1 | $18 |
| BTG International Canada Inc. | 1 | $15 |
| Medical Device Business Services, Inc. | 1 | $15 |
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.
- GENERAL - THERAPIES$5,972
- RF 3000$3,772
- GENERAL - IO ABLATION$2,750
- Cook$1,800
- Lipiodol$1,303
- GENERAL VASCULAR INTERVENTION$933
- GENERAL EMBOLICS$212
- SIR-Spheres Microspheres$165
- JETSTREAM$111
- Neuwave$109
How this compares
$27,041 in reported general payments places this provider in the 95th percentile of 2,506 diagnostic radiology 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.
Other diagnostic radiology in Houston
- Harlan HarveyHouston$583K
- Sasidhar YallampalliHouston$263K
- Debra ButlerHouston$262K
- Melissa PriceHouston$233K
- Vivek BansalHouston$173K
- Stephen RoseHouston$163K
- Sankaman PraisoodyHouston$147K
- John LeeHouston$121K
- Nakul GuptaHouston$80K
- Tanya MoseleyHouston$57K
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.