Mark Maddox
Internal Medicine Physician · Durham, NC
Mark Maddox is an internal medicine physician with a practice address in Durham, North Carolina, and NPI 1255744124, issued on Jun 8, 2014. Check the license on the North Carolina Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark Maddox
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OT016080 PA
Self-reported in NPPES; status is on the state search - Practice location
- 508 Fulton St, Durham, NC 27705
- Phone
- (919) 286-0411
- Enumerated
- Jun 8, 2014
- Record last updated
- Jun 12, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20240731003430); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,056 in North Carolina → Look up another NPI →
Also registered at 508 Fulton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Shruti Adiga, M.D.Internal Medicine Physician1932465374
- Hamid Afshari, DDSGeneral Practice Dentistry1730100280
- Adolf AghogahCase Management Registered Nurse1205752284
Verify Mark Maddox in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNorth Carolina Medical BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
207 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Prochlorperazine Maleate23 claims
- Abiraterone Acetate18 claims
- Prednisone18 claims
- Letrozole16 claims
- Ondansetron Hcl16 claims
- Hydroxyurea14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Duke Health Integrated Practice IncDurham, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Maddox among 4,056 internal medicine physician records in North Carolina
Mark Maddox is one of 4,056 internal medicine physician records with a practice address in North Carolina. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2014 · median 2004 among the 2,706 with a school on file
- Record last updated2020 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a North Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
380 internal medicine physician records list a practice address in Durham
They are 380 of the 13,451 NPPES records with a practice address in Durham, and 4,056 internal medicine physician records in North Carolina.
All 4,056 in North Carolina → Every provider in Durham → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Vaidehi Boinapally, MDDurham, NC 277051548227978
- Sol Gazzingan, M.D.Durham, NC 277051851389654
- William Knaack, M.D.Durham, NC 277051982666517
- Stuart Manning, M.D.Durham, NC 277051043217086
- David Matchar, MDDurham, NC 277051942261268
- Claudia Nassaralla, M.D.Durham, NC 277051114903275
- John Paat, M.D.Durham, NC 277051518944909
- Suman PrasadDurham, NC 277051760460349
Common questions
What is Mark Maddox's NPI number?
Mark Maddox's National Provider Identifier (NPI) is 1255744124, issued on Jun 8, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Mark Maddox located?
The NPPES record lists a practice address at 508 Fulton St, Durham, NC, 27705. Phone: (919) 286-0411. Providers update this record themselves, so call before visiting.
How can I verify Mark Maddox's license?
Search the North Carolina Medical Board at https://portal.ncmedboard.org/verification/search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Maddox prescribe under Medicare Part D?
In 2024, Mark Maddox had 207 Medicare Part D claims for 53 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.