William R. Knaack, M.D.
Internal Medicine Physician · Durham, NC
William R. Knaack, M.D. is an internal medicine physician with a practice address in Durham, North Carolina, and NPI 1982666517, issued on Apr 6, 2006. Check the license on the North Carolina Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William R. Knaack
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 508 Fulton St, Durham, NC 27705
- Phone
- (919) 286-0411
- Enumerated
- Apr 6, 2006
- Record last updated
- Jul 13, 2026
- Entity
- Type 1 · individual
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Verify William R. Knaack 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
William R. Knaack among 4,056 internal medicine physician records in North Carolina
William R. Knaack, M.D. 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 not. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 52% newer
- In a Medicare fileNo · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2026 · 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. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
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
- 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
- Kate Queen, MDDurham, NC 277051871586206
Common questions
What is William R. Knaack, M.D.'s NPI number?
William R. Knaack, M.D.'s National Provider Identifier (NPI) is 1982666517, issued on Apr 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William R. Knaack, M.D. 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 William R. Knaack, M.D.'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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.