Katie O'Sullivan
Endocrinology, Diabetes & Metabolism · Chicago, ILNPI 1902038094
Payments from drug & device makers
Across 16 payments — averaging $31.37 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Novo Nordisk$239
- Tolmar, Inc.$115
- Sequel Med Tech, LLC$58
- Mannkind Corporation$43
- Lilly USA, LLC$22
- Dexcom, Inc.$13
- plus $12 from 1 others
What the payments were for
- Food & beverage$22144%
- Education$28156%
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 |
|---|---|---|
| Novo Nordisk | 8 | $239 |
| Tolmar, Inc. | 1 | $115 |
| Sequel Med Tech, LLC | 3 | $58 |
| Mannkind Corporation | 1 | $43 |
| Lilly USA, LLC | 1 | $22 |
| Dexcom, Inc. | 1 | $13 |
| Xeris Pharmaceuticals, Inc. | 1 | $12 |
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.
- FENSOLVI$115
How this compares
$502 in reported general payments places this provider in the 40th percentile of 347 endocrinology, diabetes & metabolism providers in Illinois.
See all endocrinology, diabetes & metabolism providers in Illinois →
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 |
|---|---|---|
| OzempicSemaglutide | 133 | $250,029 |
| MounjaroTirzepatide | 115 | $126,109 |
| TrulicityDulaglutide | 71 | $104,786 |
| JardianceEmpagliflozin | 62 | $80,909 |
| Tresiba Flextouch U-200Insulin Degludec | 36 | $33,403 |
| Toujeo SolostarInsulin Glargine,hum.Rec.Anlog | 18 | $26,838 |
| Omnipod 5 Dexg7g6 Pods (Gen 5)Insulin Pump Cart,auto,bt,g6/7 | 20 | $24,987 |
| Fiasp FlextouchInsulin Aspart (Niacinamide) | 16 | $19,538 |
| Cinacalcet Hcl | 14 | $16,915 |
| TradjentaLinagliptin | 12 | $16,271 |
| Humalog Kwikpen U-100Insulin Lispro | 30 | $9,999 |
| Tresiba Flextouch U-100Insulin Degludec | 19 | $9,254 |
| Novolog FlexpenInsulin Aspart | 19 | $7,395 |
| Basaglar Kwikpen U-100Insulin Glargine,hum.Rec.Anlog | 13 | $7,227 |
| Lantus SolostarInsulin Glargine,hum.Rec.Anlog | 48 | $7,065 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Novo NordiskOzempic, Novolog | $239 | $253,254144 claims |
| Lilly USA, LLCMounjaro, Trulicity | $22 | $230,895186 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 40th percentile of 347 endocrinology, diabetes & metabolism providers in Illinois.
Other endocrinology, diabetes & metabolism in Chicago
- Leon FogelfeldChicago$1.5M
- Grazia AleppoChicago$1.4M
- Wahid KassarChicago$884K
- Wenyu HuangChicago$639K
- Silvana PannainChicago$575K
- Tamara VokesChicago$448K
- George BakrisChicago$429K
- William LoweChicago$372K
- Rajesh JainChicago$285K
- Louis PhilipsonChicago$236K
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.