Who Paid My Doc
Ari Baron
San Francisco, CA Medical Doctor
NPI 1013086420 CMS profile 318012
2100 Webster Street Suite 225, San Francisco, CA 94115
General payments
$704,794
Research payments
$237
Ownership & investment interest
$0
Research they led as principal investigator
$2,375,280
Through program year 2025, Ari Baron of San Francisco, CA is reported in the CMS Open Payments database as having received $704,794 across 1,160 general payments and $237 in research payments paid to them. Separately, studies naming them as principal investigator received $2,375,280 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.
By program year
8 rows| Year | Kind | Relative to this record's peak year | Amount | Records |
|---|---|---|---|---|
| 2025 | General | $81,979 | 127 | |
| 2024 | General | $49,173 | 116 | |
| 2023 | General | $109,130 | 153 | |
| 2022 | General | $114,495 | 192 | |
| 2021 | General | $101,933 | 169 | |
| 2020 | General | $53,805 | 112 | |
| 2020 | Research | $237 | 1 | |
| 2019 | General | $194,278 | 291 |
Beside peers
- Ari Baron
- California median
- Middle half of California
- National median
In program year 2025, general payments to Ari Baron were reported at $81,979. Among 98,626 California profiles paid that year, the median was $172 and the middle half received between $54 and $610.
Show as a table
| Year | Ari Baron | California median | Middle half | National median |
|---|---|---|---|---|
| 2019 | $194,278 | $161 | $50–$652 | $163 |
| 2020 | $53,805 | $114 | $34–$392 | $114 |
| 2021 | $101,933 | $137 | $41–$509 | $132 |
| 2022 | $114,495 | $152 | $48–$573 | $149 |
| 2023 | $109,130 | $162 | $50–$581 | $160 |
| 2024 | $49,173 | $162 | $52–$583 | $164 |
| 2025 | $81,979 | $172 | $54–$610 | $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 · 55 drugsPart D claims
2,448
Drug cost
$14,841,388
Branded share of claims
67.1%
| Drug | Type | Relative to their largest | Claims | Drug cost |
|---|---|---|---|---|
| Nubeqa Darolutamide | Brand | 398 | $5,280,039 | |
| Lupron Depot Leuprolide Acetate | Brand | 133 | $809,746 | |
| Keytruda Pembrolizumab | Brand | 69 | $773,826 | |
| Revlimid Lenalidomide | Brand | 34 | $647,896 | |
| Lynparza Olaparib | Brand | 38 | $622,037 | |
| Xtandi Enzalutamide | Brand | 54 | $600,150 | |
| Tagrisso Osimertinib Mesylate | Brand | 33 | $582,919 | |
| Brukinsa Zanubrutinib | Brand | 34 | $511,426 | |
| Ojjaara Momelotinib Dihydrochloride | Brand | 17 | $468,779 | |
| Idhifa Enasidenib Mesylate | Brand | 13 | $433,090 |
The 10 drugs with the highest cost, of 55 counted.
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 8,746 Part D prescribers listed as Hematology-Oncology; they describe a distribution and say nothing about conduct.
Billing to Medicare
Part B · data year 2024 · 109 billing codesPaid by Medicare
$2,447,280
Medicare patients
584
Services billed
143,015
| Condition among their Medicare patients | Relative to the most common | Share of patients |
|---|---|---|
| High blood pressure | 72% | |
| Cancer | 57% | |
| Arthritis | 38% | |
| Diabetes | 30% | |
| Ischemic heart disease | 29% | |
| Chronic kidney disease | 28% | |
| Atrial fibrillation | 21% | |
| Depression | 19% |
| Drug given in the clinic | Where | Patients | Services | Paid by Medicare |
|---|---|---|---|---|
| Injection, pembrolizumab, 1 mg J9271 | Office | 15 | 8,815 | $392,910 |
| Injection, nivolumab, 1 mg J9299 | Office | 11 | 7,902 | $193,337 |
| Injection, denosumab, 1 mg J0897 | Office | 50 | 9,163 | $187,867 |
| Injection, darbepoetin alfa, 1 microgram (non-esrd use) J0881 | Office | 28 | 20,228 | $47,180 |
| Injection, pegfilgrastim-cbqv, biosimilar, (udenyca), 0.5 mg Q5111 | Office | 19 | 425 | $46,613 |
| Leuprolide acetate (for depot suspension), 7.5 mg J9217 | Office | 48 | 223 | $25,845 |
| Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) Q0138 | Office | 22 | 19,380 | $5,341 |
| Injection, leucovorin calcium, per 50 mg J0640 | Office | 19 | 1,181 | $3,992 |
| Injection, fluorouracil, 500 mg J9190 | Office | 23 | 1,036 | $2,399 |
| Injection, palonosetron hcl, 25 mcg J2469 | Office | 54 | 2,098 | $1,506 |
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 59 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 |
|---|---|---|---|---|
| OPDIVO |
|
$18,902 | 26 | 7,902 |
| Nubeqa |
|
$14,599 | 398 | — |
| VENCLEXTA |
|
$12,973 | 16 | — |
| KEYTRUDA |
|
$87 | 69 | — |
| ENHERTU |
|
$77 | — | — |
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 more in the dashboard: 25 with a free account, all 59 with PatronRecords
1,161 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.
Related records
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.