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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

WILLIAM C KNOWLER M.D.
NPI 1023144615
Preventive Medicine - Public Health & General Preventive Medicine in Phoenix, AZ

Active since February 26, 2007
1550 E INDIAN SCHOOL RD, PHOENIX, AZ 85014(602) 200-5206 Get Directions Write a Review

NPPES record last updated: July 26, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About William C Knowler M.d. NPPES

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

WILLIAM C KNOWLER M.D. (NPI 1023144615) is an individual public health & general preventive medicine provider in Phoenix, Arizona, licensed in Massachusetts (36771) and active in the NPI registry since February 2007.

NPPES Registry Identity

NPI1023144615
Entity TypeIndividualMale
Primary Taxonomy2083P0901X
Provider Legal NameWILLIAM C KNOWLERCredential: M.D.
Location Address1550 E INDIAN SCHOOL RDPhoenix, AZ 85014-4972
Mailing Address1550 E Indian School RdPhoenix, AZ 85014-4972 · (602) 200-5206
Phone(602) 200-5206
Sole ProprietorNo
Enumeration DateFebruary 26, 2007
Last NPPES UpdateJuly 26, 2026
✔ NPI 1023144615 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPreventive Medicine · Public Health & General Preventive MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2083P0901X
License✔ Licensed in MA · 36771
Definition
Public health and general preventive medicine focuses on promoting health, preventing disease, and managing the health of communities and defined populations. These practitioners combine population-based public health skills with knowledge of primary, secondary, and tertiary prevention-oriented clinical practice in a wide variety of settings.
1550 E INDIAN SCHOOL RD, Phoenix, AZ 85014
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Other Providers at the Same Location NPPES 2

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

DR. ROBERT GEOFFREY NELSON MD, PHD
Internal Medicine
1550 E INDIAN SCHOOL RD
PHOENIX, AZ 85014
Maricopa County (602) 200-5205
RACHEL WILLIAMS FNP-C
Nurse Practitioner (Family)
1550 E INDIAN SCHOOL RD
PHOENIX, AZ 85014
Maricopa County (602) 200-5339

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 Knowler's NPI number?

The NPI number for William Knowler is 1023144615. It was assigned to this individual provider in the NPPES registry on February 26, 2007.

Where is William Knowler located?

William Knowler practices at 1550 E Indian School Rd, Phoenix, AZ 85014. The listed phone number is (602) 200-5206.

What is William Knowler's specialty?

The primary specialty registered for this NPI is Preventive Medicine, specializing in Public Health & General Preventive Medicine, with taxonomy code 2083P0901X.

When was this NPI record last updated?

The NPPES record for William Knowler was last updated on July 26, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.