Clarissa Mashchak, MD
Gynecology · Ooltewah, TNNPI 1245202183
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 20 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 12 manufacturers reported payments, led by Astellas Pharma US Inc at 38.7% of the total. 2025 is the largest year on record at $270, more than ten times the $19 reported in 2019. That places this record below the midpoint for gynecology clinicians in TN, where the typical reported total is $361.
Across 20 payments — averaging $21.41 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Astellas Pharma US Inc$166
- Novo Nordisk$49
- Exact Sciences$37
- Resmed Corp$25
- Organon$24
- Esperion Therapeutics, Inc.$23
- plus $105 from 6 others
What the payments were for
- Food & beverage$428100%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| Astellas Pharma US Inc | 7 | $166 |
| Novo Nordisk | 2 | $49 |
| Exact Sciences | 2 | $37 |
| Resmed Corp | 1 | $25 |
| Organon | 1 | $24 |
| Esperion Therapeutics, Inc. | 1 | $23 |
| Abbott | 1 | $22 |
| Boston Scientific | 1 | $19 |
| Lilly USA, LLC | 1 | $18 |
| Dexcom, Inc. | 1 | $17 |
| AbbVie | 1 | $15 |
| Amgen | 1 | $14 |
How this compares
$428 in reported general payments places this provider in the 50th percentile of 57 gynecology 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 |
|---|---|---|
| ProgesteroneProgesterone, Micronized | 96 | $8,719 |
| Estradiol (Twice Weekly)Estradiol | 77 | $8,333 |
| Estradiol | 56 | $3,676 |
| Estradiol (Once Weekly)Estradiol | 31 | $3,465 |
| DottiEstradiol | 23 | $2,718 |
| ValacyclovirValacyclovir Hcl | 33 | $1,046 |
| Liothyronine Sodium | 20 | $963 |
| Levothyroxine Sodium | 41 | $344 |
Paid to pharmacies, not to this prescriber.
Other gynecology in Ooltewah
- Jeffrey DellKnoxville$8K
- Tobias LimpergNashville$8K
- Susan WebbKnoxville$7K
- April SanchezCollierville$6K
- Todd BorenChattanooga$5K
- Ted AndersonNashville$3K
- Joseph PorteraChattanooga$3K
- Tracie TraverMaryville$3K
- Barbara NylanderNashville$3K
- Carol LynnCollierville$3K
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.