Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Martyn Knowles, MD

Individual provider Surgery Physician · NPI 1265632731

Martyn Knowles, MD practises Vascular Surgery in Raleigh, North Carolina. Qualified in 2007, 19 years ago. Practices with North Carolina Nephrology PA, a 58-clinician group, accepts Medicare assignment and offers telehealth. Licensed in North Carolina.

Years since qualifying
19
Licensed in
NC
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4414 Lake Boone Trl Ste 108
Raleigh, NC 27607-7513
Phone: (919) 397-9772
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 2015-00304 (NC)
Vascular Surgery Physician Taxonomy 2086S0129X · Licence 2015-00304 (NC)

Record details

NPI number1265632731
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 23, 2007
Last updated in NPPESApril 1, 2021
Certification dateApril 1, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyVASCULAR SURGERY
Also practisesGENERAL SURGERY
Medical schoolOTHER
Graduated 2007 (19 years in practice)
Group practice North Carolina Nephrology Pa — 58 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Leg revascularization (restoring blood flow) 16 times · 68th percentile
Varicose vein removal 33 times · 67th percentile
Spinal fusion 19 times · 36th percentile
Removal of tissue 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients687
Services billed 1,869 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $54,483 12 payments
Travel and Lodging $31,049 41 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $2,849 22 payments · a meal or drink at a meeting or visit, not a fee
Consulting Fee $1,500 1 payment

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at North Carolina Nephrology PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 58 clinicians in the practice; 12 are shown here.

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