Who Paid My Doc
Martyn Knowles
Surgery Raleigh, NC Medical Doctor
NPI 1265632731 CMS profile 1303477
4414 Lake Boone Trl, Suite 108, Raleigh, NC 27607
General payments
$311,228
Research payments
$4,125
Ownership & investment interest
$0
Research they led as principal investigator
$64,439
Through program year 2025, Martyn Knowles of Raleigh, NC is reported in the CMS Open Payments database as having received $311,228 across 342 general payments and $4,125 in research payments paid to them. Separately, studies naming them as principal investigator received $64,439 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 99th percentile of Surgery profiles with reported payments. Percentile describes the distribution, not the conduct.
By program year
9 rows| Year | Kind | Relative to this record's peak year | Amount | Records |
|---|---|---|---|---|
| 2025 | General | $89,882 | 76 | |
| 2024 | General | $60,682 | 51 | |
| 2023 | General | $72,066 | 53 | |
| 2023 | Research | $1,875 | 1 | |
| 2022 | General | $26,814 | 43 | |
| 2021 | General | $16,785 | 31 | |
| 2020 | General | $20,371 | 28 | |
| 2020 | Research | $2,250 | 1 | |
| 2019 | General | $24,628 | 60 |
Beside peers
- Martyn Knowles
- Surgery median
- Middle half of Surgery
- National median
In program year 2025, general payments to Martyn Knowles were reported at $89,882. Among 17,702 Surgery profiles paid that year, the median was $280 and the middle half received between $91 and $1,259.
Show as a table
| Year | Martyn Knowles | Surgery median | Middle half | National median |
|---|---|---|---|---|
| 2019 | $24,628 | $253 | $82–$1,521 | $163 |
| 2020 | $20,371 | $131 | $40–$706 | $114 |
| 2021 | $16,785 | $168 | $50–$904 | $132 |
| 2022 | $26,814 | $224 | $76–$1,218 | $149 |
| 2023 | $72,066 | $253 | $82–$1,255 | $160 |
| 2024 | $60,682 | $279 | $90–$1,381 | $164 |
| 2025 | $89,882 | $280 | $91–$1,259 | $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 · 4 drugsPart D claims
300
Drug cost
$135,961
Branded share of claims
94.7%
| Drug | Type | Relative to their largest | Claims | Drug cost |
|---|---|---|---|---|
| Eliquis Apixaban | Brand | 137 | $119,796 | |
| Xarelto Rivaroxaban | Brand | 11 | $14,777 | |
| Clopidogrel Clopidogrel Bisulfate | Brand | 136 | $1,187 | |
| Cilostazol | Generic | 16 | $201 |
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 3,087 Part D prescribers listed as Vascular Surgery; they describe a distribution and say nothing about conduct.
Billing to Medicare
Part B · data year 2024 · 122 billing codesPaid by Medicare
$198,611
Medicare patients
687
Services billed
1,869
| Condition among their Medicare patients | Relative to the most common | Share of patients |
|---|---|---|
| High blood pressure | 75% | |
| Arthritis | 57% | |
| Ischemic heart disease | 50% | |
| Diabetes | 41% | |
| Chronic kidney disease | 39% | |
| Heart failure | 33% | |
| Atrial fibrillation | 27% | |
| Depression | 25% |
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.
Records
344 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 Surgery in North Carolina
Related records
Surgery in North Carolina
Practitioners in the same specialty and state, ranked by reported value.
All Surgery
Everyone recorded under this specialty, nationwide.
Doctors in North Carolina
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.