Nicolas Casellas Castillo, MD
Obstetrics & Gynecology · San Juan, PRNPI 1770540304
Payments from drug & device makers
What this record shows
Merck accounts for 74.5% of it on its own, with 6 other manufacturers making up the rest. Reporting peaked in 2019 at $2,221 and has fallen 98.7% since, to $29 in 2025. Among obstetrics & gynecology clinicians in PR 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 25 payments — averaging $101.63 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Merck$2K
- AbbVie$223
- PBG Puerto Rico LLC$157
- Hologic Sales And Service, LLC$142
- Amgen$93
- Pfizer Pharmaceuticals LLC$17
- plus $15 from 1 others
What the payments were for
- Consulting fees$1,50059%
- Food & beverage$1,04141%
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 | 7 | $1,893 |
| AbbVie | 3 | $223 |
| PBG Puerto Rico LLC | 8 | $157 |
| Hologic Sales And Service, LLC | 4 | $142 |
| Amgen | 1 | $93 |
| Pfizer Pharmaceuticals LLC | 1 | $17 |
| BD | 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.
How this compares
$2,541 in reported general payments places this provider in the 90th percentile of 333 obstetrics & gynecology providers in Puerto Rico.
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 |
|---|---|---|
| PremproEstrogen,con/M-Progest Acet | 12 | $2,956 |
| Estradiol | 83 | $2,455 |
| ProgesteroneProgesterone, Micronized | 77 | $2,425 |
| Estradiol (Once Weekly)Estradiol | 12 | $878 |
| Clotrimazole-BetamethasoneClotrimazole/Betamethasone Dip | 21 | $422 |
| Clobetasol Propionate | 13 | $390 |
| Ketoconazole | 12 | $117 |
Paid to pharmacies, not to this prescriber.
Other obstetrics & gynecology in San Juan
- Erika Benabe-GonzalezSan Juan$24K
- Carlos FonsecaSan Juan$8K
- Olga PereiraSan Juan$7K
- Eduardo Muniz VelezSan Juan$7K
- Soan Cruz-OrtizSan Juan$5K
- Janice Soto-MoralesSan Juan$5K
- Gabriella Rivera OrtizSan Juan$4K
- Maria ZweigSan Juan$2K
- Natalia Cardenas SuarezSan Juan$2K
- Miriam Matos-MatosSan Juan$2K
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.