Who Paid My Doc
Ilysa Diamond
Gastroenterology Oak Park, IL Doctor of Osteopathy
NPI 1356596332 CMS profile 198273
1010 Lake St Ste 424, Oak Park, IL 60301
General payments
$6,808
Research payments
$0
Ownership & investment interest
$0
Research they led as principal investigator
$19,000
Through program year 2025, Ilysa Diamond of Oak Park, IL is reported in the CMS Open Payments database as having received $6,808 across 223 general payments and $0 in research payments paid to them. Separately, studies naming them as principal investigator received $19,000 in research payments, paid to institutions rather than to them.
No combined total General, research and ownership are kept apart. Each is reported under its own rules, and ownership is not money that moved at all but the value of a stake held. A meal, a clinical trial grant and a shareholding do not add up to anything meaningful, so this site does not add them. The principal-investigator line is research money paid to institutions for studies they led — not to them — and is not added to anything either.
General payments for this record sit in the 74th percentile of Gastroenterology profiles with reported payments. Percentile describes the distribution, not the conduct.
By program year
7 rows| Year | Kind | Relative to this record's peak year | Amount | Records |
|---|---|---|---|---|
| 2025 | General | $1,918 | 68 | |
| 2024 | General | $850 | 35 | |
| 2023 | General | $987 | 54 | |
| 2022 | General | $762 | 30 | |
| 2021 | General | $170 | 7 | |
| 2020 | General | $1,781 | 17 | |
| 2019 | General | $340 | 12 |
Beside peers
- Ilysa Diamond
- Gastroenterology median
- Middle half of Gastroenterology
- National median
In program year 2025, general payments to Ilysa Diamond were reported at $1,918. Among 13,050 Gastroenterology profiles paid that year, the median was $639 and the middle half received between $167 and $1,700.
Show as a table
| Year | Ilysa Diamond | Gastroenterology median | Middle half | National median |
|---|---|---|---|---|
| 2019 | $340 | $417 | $126–$1,100 | $163 |
| 2020 | $1,781 | $224 | $74–$624 | $114 |
| 2021 | $170 | $352 | $106–$1,054 | $132 |
| 2022 | $762 | $448 | $129–$1,270 | $149 |
| 2023 | $987 | $533 | $150–$1,390 | $160 |
| 2024 | $850 | $605 | $160–$1,606 | $164 |
| 2025 | $1,918 | $639 | $167–$1,700 | $169 |
Breakdown
A payment can name more than one product, so these amounts overlap and do not add up to the general-payment figure.
Prescribing to Medicare patients
Part D · data year 2024 · 5 drugsPart D claims
164
Drug cost
$27,046
Branded share of claims
17.7%
| Drug | Type | Relative to their largest | Claims | Drug cost |
|---|---|---|---|---|
| Linzess Linaclotide | Brand | 16 | $19,674 | |
| Lubiprostone | Generic | 23 | $4,908 | |
| Pantoprazole Sodium | Generic | 89 | $1,277 | |
| Sod Sulf-Potass Sulf-Mag Sulf Sodium, Potassium,mag Sulfates | Brand | 13 | $992 | |
| Famotidine | Generic | 23 | $196 |
Drug cost is what was paid for the drugs at the pharmacy — by Medicare, the patient and others — and is not money to the prescriber. Medicare Part D only: drugs dispensed to Medicare beneficiaries. A drug with fewer than 11 claims for this prescriber is not published, so a missing drug does not mean zero. The medians are for the 14,294 Part D prescribers listed as Gastroenterology; they describe a distribution and say nothing about conduct.
Billing to Medicare
Part B · data year 2024 · 14 billing codesPaid by Medicare
$20,527
Medicare patients
94
Services billed
211
| Condition among their Medicare patients | Relative to the most common | Share of patients |
|---|---|---|
| High blood pressure | 73% | |
| Arthritis | 54% | |
| Diabetes | 36% | |
| Ischemic heart disease | 29% | |
| Depression | 26% | |
| Osteoporosis | 22% | |
| Chronic kidney disease | 16% | |
| Heart failure | 14% |
Medicare Part B only: services billed to Medicare. Rows covering fewer than 11 beneficiaries are not published. Only drugs given in the clinic are itemised here; the rest of what this provider billed is in the total above.
Payments and prescribing
First 5 of 10 products · payments 2024Two separate records. The payments come from Open Payments and the claims from Medicare. They are set side by side because they name the same product; they do not show that a payment affected a prescription.
| Product | Paid by | Related payments | Part D claims | Part B services |
|---|---|---|---|---|
| ENTYVIO |
|
$227 | — | — |
| LINZESS |
|
$132 | 16 | — |
| ZEPOSIA |
|
$81 | — | — |
| IBSRELA |
|
$67 | — | — |
| SKYRIZI |
|
$61 | — | — |
A dash means Medicare published no figure for this doctor and product — fewer than 11 claims, or the product is not covered under that part — which is not the same as none. Payments are general payments only; one that names several products is split evenly between them, so an amount is payments related to the product, not money paid for it.
See all 10 in the dashboard with a free accountRecords
223 reportedEvery payment, record by record
Date, company, amount, what it was for and the product named — filter by year, kind and company, or download as CSV.
Other Gastroenterology in Illinois
Related records
Gastroenterology in Illinois
Practitioners in the same specialty and state, ranked by reported value.
All Gastroenterology
Everyone recorded under this specialty, nationwide.
Doctors in Illinois
Every practitioner in the state with a reported payment.
How to read this page
What each amount means, and what it does not mean.
What this means
U.S. law requires drug and medical device manufacturers to report payments and transfers of value they make to physicians and teaching hospitals. The Centers for Medicare & Medicaid Services publishes that record each year. This page shows what was reported about this person, and nothing else.
An ownership interest is different from the other two. It is not a payment: it is a stake — shares, options, a partnership holding — that a physician or an immediate family member held in a manufacturer during that year. The figure shown is what the stake was reported to be worth.
Research payments frequently pass through a clinician to the institution running a trial, and rarely represent personal income. They should be read differently from general payments.