ANDREW STEIDLEY DMD MS PLLC
NPI 1023805033
Dentist - Endodontics in Longview, WA

NPI Status: Active since April 22, 2025

Contact Information

1700 HUDSON ST
SUITE #202
LONGVIEW, WA
ZIP 98632
Phone: (360) 342-6700

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  • Organization
  • Dentist
  • Endodontics

About ANDREW STEIDLEY DMD MS PLLC

This page provides the complete NPI Profile along with additional information for Andrew Steidley Dmd Ms Pllc, a provider established in Longview, Washington operating as a Dentist, focusing in endodontics . The healthcare provider is registered in the NPI registry with number 1023805033 assigned on April 2025. The practitioner's primary taxonomy code is 1223E0200X. The provider is registered as an organization and their NPI record was last updated one year ago. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The authorized official of this NPI record is Andrew R Steidley Dmd, Ms, Diplo Abe (Dr/owner)

NPI
1023805033
Provider Name
ANDREW STEIDLEY DMD MS PLLC
Entity Type
Organization
Location Address
1700 HUDSON ST SUITE #202 LONGVIEW, WA 98632
Location Phone
(360) 342-6700
Mailing Address
1700 HUDSON ST STE 202 LONGVIEW, WA 98632
Mailing Phone
(360) 342-6700
Is Sole Proprietor?
No
Is Organization Subpart?
No
Enumeration Date
04-22-2025
Last Update Date
04-22-2025
Code Navigator

A dentist like Andrew Steidley Dmd Ms Pllc is a skilled in and licensed provider that diagnoses and treats problems with patients teeth, gums, and related parts of the mouth. Dentists educate patients on how to take care of the teeth and gums and provide information on diet choices that affect oral health. Dentists must be licensed in the state in which they work.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Dentist Endodontics

Taxonomy Code
1223E0200X
Type
Dental Providers
Taxonomy Description
The branch of dentistry that is concerned with the morphology, physiology and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including biology of the normal pulp, the etiology, diagnosis, prevention and treatment of diseases and injuries of the pulp and associated periradicular conditions.

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name

ANDREW R STEIDLEY DMD, MS, DIPLO ABE

Authorized Official Title
DR/OWNER
Authorized Official Phone
(360) 342-6700

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1023805033, we treat the final digit (3) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 47. The final step is to find the difference between that total and the next multiple of ten (50 - 47 = 3).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
0
Unchanged
Pos 3
2
Doubled → 4
Pos 4
3
Unchanged
Pos 5
8
Doubled → 16 → 1 + 6
Pos 6
0
Unchanged
Pos 7
5
Doubled → 10 → 1 + 0
Pos 8
0
Unchanged
Pos 9
3
Doubled → 6
Check
3
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 2 → 4 8 → 16 → 7 5 → 10 → 1 3 → 6

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 0 + 4 + 3 + 1 + 6 + 0 + 1 + 0 + 0 + 6 + 24 = 47

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 47 is 50. The difference is the calculated check digit.

50 - 47 = 3
This NPI is valid
The calculated check digit is 3, which matches the last digit of 1023805033.

Other Providers at the Same Location


The following 2 providers are registered at the same or a nearby location.

Registered Nurse (Home Health)
1700 HUDSON ST
LONGVIEW, WA 98632
Physical Therapy Assistant
1700 HUDSON ST
LONGVIEW, WA 98632

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1023805033, enumerated as an "organization" on April 22, 2025.

The provider is located at 1700 HUDSON ST SUITE #202 LONGVIEW, WA 98632 and the phone number is (360) 342-6700.

Dentist with taxonomy code 1223E0200X and a focus in Endodontics.