Damla Karsan, MD
Obstetrics & Gynecology · Houston, TXNPI 1699760116
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $50,795 of the $57,834 with a category attached, or 87.8%. Organon accounts for 60.7% of it on its own, with 37 other manufacturers making up the rest. Reporting peaked in 2022 at $19,591 and has fallen 80.3% since, to $3,854 in 2025. Among obstetrics & gynecology 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 282 payments — averaging $205.08 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Organon$35K
- Merck$7K
- Myovant Sciences Inc.$7K
- Gen-probe Sales & Service, Inc.$4K
- AbbVie$2K
- Astellas Pharma US Inc$522
- plus $2K from 32 others
What the payments were for
- Speaking & faculty fees$50,79588%
- Travel & lodging$8611%
- Food & beverage$5,97310%
- Education$2050%
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 |
|---|---|---|
| Organon | 48 | $35,113 |
| Merck | 14 | $7,240 |
| Myovant Sciences Inc. | 23 | $7,109 |
| Gen-probe Sales & Service, Inc. | 3 | $3,813 |
| AbbVie(2 entities) | 74 | $1,776 |
| Astellas Pharma US Inc | 16 | $522 |
| Mayne Pharma Commercial LLC | 9 | $216 |
| Sumitomo Pharma America, Inc. | 11 | $214 |
| Pfizer | 12 | $204 |
| Caldera Medical, Inc | 1 | $144 |
| Sage Therapeutics, LLC | 6 | $138 |
| Hologic Sales And Service, LLC | 5 | $136 |
| Exact Sciences | 6 | $121 |
| Exeltis, USA Inc. | 6 | $114 |
| Agile Therapeutics, Inc. | 6 | $109 |
| Bayer | 4 | $96 |
| Myriad Women's Health, Inc. | 1 | $96 |
| Scynexis, Inc. | 3 | $63 |
| Coopersurgical, Inc. | 3 | $62 |
| Supernus Pharmaceuticals, Inc. | 2 | $50 |
| Evofem Biosciences, Inc. | 3 | $45 |
| Intuitive Surgical | 1 | $40 |
| Covidien LP | 2 | $38 |
| Lupin Inc. | 3 | $38 |
| Therapeuticsmd, Inc. | 2 | $36 |
| Aspira Women's Health Inc | 2 | $35 |
| LSI Solutions Inc | 1 | $32 |
| Vertical Pharmaceuticals, LLC | 2 | $32 |
| Mycovia Pharmaceuticals, Inc. | 1 | $30 |
| Shield Therapeutics Inc | 2 | $30 |
| Avion Pharmaceuticals | 2 | $29 |
| Novo Nordisk | 2 | $28 |
| Daiichi Sankyo Inc. | 1 | $17 |
| Medicem Inc. | 1 | $17 |
| AMAG Pharmaceuticals, Inc. | 1 | $16 |
| Lilly USA, LLC | 1 | $15 |
| Minerva Surgical, Inc | 1 | $11 |
| Mylan Pharmaceuticals Inc. | 1 | $11 |
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
$57,834 in reported general payments places this provider in the 95th percentile of 3,099 obstetrics & gynecology 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Estradiol (Twice Weekly)Estradiol | 18 | $859 |
| Estradiol | 22 | $662 |
| ProgesteroneProgesterone, Micronized | 11 | $203 |
Paid to pharmacies, not to this prescriber.
Other obstetrics & gynecology in Houston
- George KuhnHouston$244K
- Daisy AyimHouston$188K
- Shannon WestinHouston$176K
- Asha BhalwalHouston$151K
- Nicole TranHouston$133K
- Sandra HurtadoHouston$123K
- Alvaro MontealegreHouston$92K
- Patti RossHouston$72K
- Christopher JayneHouston$52K
- Hector DelcastilloHouston$42K
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.