WILLIAM ERNST DDS
NPI 1255028072
Dentist - General Practice in Sioux Falls, SD

Q: What is William Ernst's NPI number?

The NPI number for William Ernst is 1255028072. It was assigned to this individual provider in the NPPES registry on April 20, 2023.

Q: What is William Ernst's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for William Ernst was last updated on August 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.

Active since April 20, 2023

4930 E 57TH ST, SIOUX FALLS, SD 57108(605) 202-5333 Get Directions Write a Review

NPPES record last updated: August 28, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

On this page

About William Ernst Dds NPPES

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

WILLIAM ERNST DDS (NPI 1255028072) is an individual general practice provider in Sioux Falls, South Dakota, licensed in South Dakota (D1499) and active in the NPI registry since April 2023.

NPPES Registry Identity

NPI1255028072

Entity TypeIndividualMale

Primary Taxonomy1223G0001X

Provider Legal NameWILLIAM ERNSTCredential: DDS

Location Address4930 E 57TH STSioux Falls, SD 57108-8705

Mailing Address3009 Treasure Hills BlvdHarlingen, TX 78550-8656

Phone(605) 202-5333

Sole ProprietorYes

Enumeration DateApril 20, 2023

Last NPPES UpdateAugust 28, 2025

NPPES CertifiedAugust 28, 2025

✔ NPI 1255028072 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers

Taxonomy Code1223G0001X

Licenses✔ Licensed in SD · D1499✔ Licensed in TX · 41755

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.

4930 E 57TH ST, Sioux Falls, SD 57108

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Delta Dental PPO, UnitedHealthcare.Insurance ›

Other Providers at the Same Location NPPES

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

EASTSIDE DRAKE SMILES PC

Dentist (General Practice)

4930 E 57TH ST
SIOUX FALLS, SD 57108

Lincoln County (605) 202-5333

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 Ernst's NPI number?

The NPI number for William Ernst is 1255028072. It was assigned to this individual provider in the NPPES registry on April 20, 2023.

Where is William Ernst located?

William Ernst practices at 4930 E 57th St, Sioux Falls, SD 57108. The listed phone number is (605) 202-5333.

What is William Ernst's specialty?

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

What insurance does William Ernst accept?

Health plans from Delta Dental PPO and UnitedHealthcare list William Ernst as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for William Ernst was last updated on August 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months 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.