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DR. GRAHAM HOWERZYL DDS
NPI 1659217859
Dentist - General Practice in Sioux Center, IA

Active since April 28, 2026
159 S MAIN AVE, SIOUX CENTER, IA 51250(712) 722-2618 Get Directions Write a Review

NPPES record last updated: June 23, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Graham Howerzyl Dds NPPES

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

DR. GRAHAM HOWERZYL DDS (NPI 1659217859) is an individual general practice provider in Sioux Center, Iowa, licensed in Iowa (DDS-10511) and active in the NPI registry since April 2026.

NPPES Registry Identity

NPI1659217859
Entity TypeIndividualMale
Primary Taxonomy1223G0001X
Provider Legal NameDR. GRAHAM HOWERZYLCredential: DDS
Location Address159 S MAIN AVESioux Center, IA 51250-1535
Mailing Address327 Parkview CtNorth Liberty, IA 52317-9640
Phone(712) 722-2618
Sole ProprietorYes
Enumeration DateApril 28, 2026
Last NPPES UpdateJune 23, 2026
NPPES CertifiedJune 23, 2026
✔ NPI 1659217859 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers
Taxonomy Code1223G0001X
License✔ Licensed in IA · DDS-10511
Definition
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.
159 S MAIN AVE, Sioux Center, IA 51250
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Other Providers at the Same Location NPPES 6

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

AGAPE DENTISTRY, PC
Dentist (General Practice)
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2618
DR. JOSEPH M VAN ES DDS
Dentist (General Practice)
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2618
BYLSMA-MULDER FAMILY DENTISTRY, P.C.
Clinic/Center (Dental)
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2633
AGAPE DENTISTRY, PLC
Dentist (General Practice)
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2618
LEANNE C. BYLSMA-MULDER D.D.S.
Dentist
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2633
DR. KEN L ADDINK DDS
Dentist (General Practice)
159 S MAIN AVE
SIOUX CENTER, IA 51250
Sioux County (712) 722-2618

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 Graham Howerzyl's NPI number?

The NPI number for Graham Howerzyl is 1659217859. It was assigned to this individual provider in the NPPES registry on April 28, 2026.

Where is Graham Howerzyl located?

Graham Howerzyl practices at 159 S Main Ave, Sioux Center, IA 51250. The listed phone number is (712) 722-2618.

What is Graham Howerzyl's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for Graham Howerzyl was last updated on June 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 43 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.