Christopher Sizemore, DO
Obstetrics & Gynecology · Nashville, TNNPI 1891842688
Payments from drug & device makers
What this record shows
This record is dominated by education: $10,500 of the $12,509 with a category attached, or 83.9%. Intuitive Surgical accounts for 94.5% of it on its own, with 15 other manufacturers making up the rest. Reporting peaked in 2022 at $9,013 and has fallen 97.7% since, to $208 in 2025. Among obstetrics & gynecology clinicians in TN 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 39 payments — averaging $320.73 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$12K
- Stryker$131
- Hologic Sales And Service, LLC$79
- Organon$63
- Coopersurgical, Inc.$56
- Astellas Pharma US Inc$50
- plus $305 from 10 others
What the payments were for
- Travel & lodging$1,28910%
- Food & beverage$7196%
- Education$10,50084%
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 |
|---|---|---|
| Intuitive Surgical | 12 | $11,824 |
| Stryker | 1 | $131 |
| Hologic Sales And Service, LLC | 4 | $79 |
| Organon | 3 | $63 |
| Coopersurgical, Inc. | 3 | $56 |
| Astellas Pharma US Inc | 2 | $50 |
| Exeltis, USA Inc. | 3 | $46 |
| Channel Medsystems, Inc. | 1 | $44 |
| Shield Therapeutics Inc | 1 | $39 |
| Pfizer | 2 | $39 |
| AbbVie | 2 | $28 |
| Sumitomo Pharma America, Inc. | 1 | $26 |
| Bayer | 1 | $24 |
| Johnson & Johnson | 1 | $22 |
| Medtronic | 1 | $19 |
| Exact Sciences | 1 | $17 |
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.
- DAVINCI XI$10,500
- Da Vinci Surgical System$1,270
- SPY-PHI SYSTEM$131
How this compares
$12,509 in reported general payments places this provider in the 95th percentile of 763 obstetrics & 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.
Other obstetrics & gynecology in Nashville
- Michael SwanNashville$146K
- Royce AdkinsNashville$95K
- Olga MuldoonNashville$91K
- Kimberly LooneyNashville$84K
- Lewis BellardoNashville$20K
- Suzanne BryantNashville$19K
- Stephen ClendeninNashville$14K
- Laura BinkleyNashville$12K
- Georgia FerrellNashville$11K
- Nicole HeidemannNashville$9K
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.