Dr. Martyn Knowles, MD
- Medicare services, 2024
- 1,532
- Medicare patients, 2024
- 687
- Part D claims, 2024
- 367
- Hospital affiliations
- 2
- Industry payments
- $464,350
- Practice address
- 4420 Lake Boone Trail, Raleigh, NC 27607
- Practice phone
- Call (919) 784-3100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Knowles' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Martyn Knowles is a general surgeon in Raleigh, North Carolina
Dr. Knowles practices at UNC Health Rex in Raleigh, North Carolina, part of University of North Carolina Health Care System.
Dr. Knowles' NPI, 1265632731, was assigned on July 23, 2007. Dr. Knowles holds North Carolina license 2015-00304.
- NPI
- 1265632731NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8527285428
- NPI enumeration date
- July 23, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (919) 784-3100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Martyn Knowles practices at UNC Health Rex in Raleigh, North Carolina
Dr. Knowles' primary practice is UNC Health Rex, at 4420 Lake Boone Trail, Raleigh, NC 27607 in Wake County. The practice phone is (919) 784-3100.
- UNC Health Rex4420 Lake Boone Trail, Raleigh, NC 27607 · Wake CountyPhone(919) 784-3100
Source: Dmand AI Affiliation Data
Dr. Martyn Knowles is affiliated with 5 sites of care and 2 medical groups
Dr. Knowles' primary practice is UNC Health Rex in Raleigh, North Carolina, part of University of North Carolina Health Care System. Dr. Knowles is also affiliated with UNC Hospitals. The medical group on file is North Carolina Heart & Vascular Hospital. Dmand AI also links Dr. Knowles to 2 more group practices and clinics, 1 clinical lab and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Martyn Knowles' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Knowles practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UNC Health Rex | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Martyn Knowles is one of 1,053 general surgeons in North Carolina
Surgery is Dr. Knowles' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Knowles is licensed in North Carolina.
Specialties and state licenses
- Surgery, North CarolinaPrimary
General surgeons near Dr. Knowles
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Martyn Knowles billed Medicare for 1,532 services in 2024
CMS data shows 1,532 Medicare services from Dr. Knowles across 24 procedure codes in 2024, for 687 Medicare patients. Medicare paid $129,254 for them.
Dr. Knowles' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 8002024: 8435%
- Office and hospital visits
- 2023: 5502024: 46515%
- Imaging
- 2023: 1332024: 1448%
- Surgery
- 2023: 672024: 8019%
Where Dr. Knowles' Medicare services took place, 2024
- In an office1,21279%
- In a facility32021%
Dr. Knowles compared with the North Carolina median for general surgeons, 2024
- Dr. Knowles
- North Carolina median
- Medicare services
- 1,532vs 15110.1 times
- Medicare patients
- 687vs 1156.0 times
- Part D claims
- 300vs 417.3 times
Medians across 950 general surgeons in North Carolina with Dmand AI profiles that report each measure.
Dr. Knowles' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Knowles and other general surgeons in North Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Martyn Knowles treated 687 Medicare patients in 2024, average age 76
CMS counts 687 Medicare patients who saw Dr. Knowles in 2024. The largest group is 75 to 84, with 298 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 7% are also on Medicaid. Their average risk score is 1.95, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Knowles' median patient age at 72, with 52% women.
Dr. Knowles' Medicare patients by age, 2024
Dr. Knowles' Medicare patients by sex, 2024
- Women32147%
- Men36653%
Chronic conditions among Dr. Knowles' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Ischemic heart disease50%
- Diabetes41%
- Chronic kidney disease39%
- Heart failure33%
- Anxiety30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Knowles' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women52%
- Men47%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Martyn Knowles wrote 367 Medicare Part D claims in 2024
In 2024, Dr. Knowles wrote 367 Medicare Part D claims for 121 patients. 59% of them were for generic drugs. CMS names the drug for 300 of them, across 4 drugs with 11 or more claims each, at $135,961 in total drug cost. In 2023, CMS named 298 claims across 5 drugs.
Dr. Knowles' Part D claims by kind of drug, 2024
- Generic215 claims59%
- Brand-name152 claims41%
Dr. Knowles' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2982024: 3001%
Drugs named by CMS: 4 in 2024, 5 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Martyn Knowles ranks in the 71st percentile for varicose vein removal in Medicare
Dr. Knowles accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Knowles as offering telehealth. CMS counts 41 procedures of varicose vein removal by Dr. Knowles, more than 71% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Knowles ranks in Medicare procedure volume
- Varicose vein removal
- 71st percentile41 procedures
- Spinal fusion
- 42nd percentile27 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Leg revascularization (restoring blood flow): 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Martyn Knowles received $464,350 in industry payments from 2016 to 2025
CMS Open Payments shows 673 general payments to Dr. Knowles from 53 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 38% of the total. Penumbra, Inc. paid the most, $229,278. It also lists 1 research payment totaling $2,250 in 2020.
General payments to Dr. Knowles by program year, 2016 to 2025
General payments to Dr. Knowles by kind, 2016 to 2025
- Speaker and faculty fees$175,38338%
- Travel and lodging$141,15431%
- Consulting fees$61,40013%
- Honoraria$47,77010%
- Other$34,5428%
Companies that paid Dr. Knowles the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Martyn Knowles's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Martyn Knowles
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Martyn Knowles' NPI number?
Dr. Martyn Knowles' NPI number is 1265632731. It was assigned on July 23, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Martyn Knowles?
Dr. Martyn Knowles is a general surgeon in Raleigh, North Carolina. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Martyn Knowles practice?
Dr. Knowles practices at 4420 Lake Boone Trail, Raleigh, NC 27607. Dr. Knowles' primary practice is UNC Health Rex in Raleigh, North Carolina, part of University of North Carolina Health Care System. Dmand AI also links Dr. Knowles to 2 group practices and clinics, 1 clinical lab and 1 medical group.
What is Dr. Martyn Knowles' office phone number?
The practice phone on file for Dr. Knowles is (919) 784-3100.
What is Dr. Martyn Knowles' medical license number?
Dr. Knowles holds North Carolina license 2015-00304.
Which hospitals is Dr. Martyn Knowles affiliated with?
Dr. Knowles practices at UNC Health Rex in Raleigh, North Carolina. Dr. Knowles is also affiliated with UNC Hospitals.
What medical group is Dr. Martyn Knowles part of?
Dr. Knowles is linked to North Carolina Heart & Vascular Hospital. Dmand AI links Dr. Knowles to 1 more medical group.
Does Dr. Martyn Knowles accept Medicare?
Yes. CMS data shows Dr. Knowles billed Medicare for 1,532 services in 2024, and Dr. Knowles accepts Medicare assignment.
Does Dr. Martyn Knowles offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Knowles as offering telehealth services.
How many Medicare patients does Dr. Martyn Knowles see?
CMS counts 687 Medicare patients who saw Dr. Knowles in 2024, with an average age of 76.
Show 4 more questionsShow fewer questions
What services does Dr. Martyn Knowles bill to Medicare?
In 2024, Dr. Knowles' most billed Medicare services were office visit, established patient (99214), blood vessel study (93922) and blood vessel study (93971).
What drugs does Dr. Martyn Knowles prescribe most?
In 2024 Medicare Part D data, Dr. Knowles' most prescribed drugs by claims were Eliquis, Clopidogrel and Cilostazol.
Has Dr. Martyn Knowles received payments from drug or device companies?
CMS Open Payments shows $464,350 in general payments to Dr. Knowles from 53 companies from 2016 to 2025. The largest total came from Penumbra, Inc.
How long has Dr. Martyn Knowles been practicing?
Dr. Knowles graduated from medical school in 2007, 19 years ago.
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