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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM R KNAACK M.D.
NPI 1982666517
Internal Medicine in Durham, NC

Active since April 06, 2006
508 FULTON ST, DURHAM, NC 27705(919) 286-0411 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About William R Knaack M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM R KNAACK M.D. (NPI 1982666517) is an individual internal medicine provider in Durham, North Carolina and active in the NPI registry since April 2006.

NPPES Registry Identity

NPI1982666517
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameWILLIAM R KNAACKCredential: M.D.
Location Address508 FULTON STDurham, NC 27705-3875
Mailing Address106 Grazing Meadows CtApex, NC 27502-3870 · (919) 387-3709
Phone(919) 286-0411
Sole ProprietorNo
Enumeration DateApril 6, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1982666517 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
508 FULTON ST, Durham, NC 27705
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MISS NANCY CAROL LEE LCSW-P, CMSW, MHA
Social Worker (Clinical)
508 FULTON ST, SOCIAL WORK SERVICE (122)
DURHAM, NC 27705
Durham County (919) 286-0411
MS. GWEN ELIZABETH MADILL LCSW
Social Worker (Clinical)
508 FULTON ST, SOCIAL WORK SERVICE
DURHAM, NC 27705
Durham County (919) 286-0411
DYLAN PRIDE HARRIS
Dietitian, Registered
508 FULTON ST
DURHAM, NC 27705
Durham County (919) 286-0411
MELISSA RAKU DAVIS PMHNP
Nurse Practitioner (Psychiatric/Mental Health)
508 FULTON ST
DURHAM, NC 27705
Durham County (720) 628-6224
HILARY D BUCHANAN
Registered Nurse
508 FULTON ST
DURHAM, NC 27705
Durham County (919) 286-0411
MS. RENEE MICHELLE MCCLELLAND AU.D.
Audiologist
508 FULTON ST, ASPS - 126
DURHAM, NC 27705
Durham County (919) 286-6961
DR. DEBORAH ANNE FISHER M.D.
Internal Medicine (Gastroenterology)
508 FULTON ST
DURHAM, NC 27705
Durham County (919) 286-6945
DR. CHRISTOPHER WILDRICK WOODS MD, MPH
Internal Medicine (Infectious Disease)
508 FULTON ST, DURHAM VAMC
DURHAM, NC 27705
Durham County (919) 286-0411

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Knaack's NPI number?

The NPI number for William Knaack is 1982666517. It was assigned to this individual provider in the NPPES registry on April 6, 2006.

Where is William Knaack located?

William Knaack practices at 508 Fulton St, Durham, NC 27705. The listed phone number is (919) 286-0411.

What is William Knaack's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for William Knaack was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.