STEVEN CHARLES SIZER
NPI 1427983915
Occupational Therapist in Wales, WI

NPI Status: Active since June 16, 2026

Contact Information

563 A J ALLEN CIR
WALES, WI
ZIP 53183
Phone: (262) 968-6300

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  • Individual
  • Male
  • Occupational Therapist

About STEVEN SIZER

This page provides the complete NPI Profile along with additional information for Steven Sizer, a provider established in Wales, Wisconsin with a medical specialization in Occupational Therapist. The healthcare provider is registered in the NPI registry with number 1427983915 assigned on June 2026. The practitioner's primary taxonomy code is 225X00000X with license number 7011-26 (WI). The provider is registered as an individual and his NPI record was last updated June 2026.

NPI
1427983915
Provider Name
STEVEN CHARLES SIZER
Gender
Male
Entity Type
Individual
Location Address
563 A J ALLEN CIR WALES, WI 53183
Location Phone
(262) 968-6300
Mailing Address
563 A J ALLEN CIR WALES, WI 53183
Mailing Phone
(262) 968-6300
Is Sole Proprietor?
No
Enumeration Date
06-16-2026
Last Update Date
06-16-2026
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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

Occupational Therapist

Taxonomy Code
225X00000X
Type
Respiratory, Developmental, Rehabilitative and Restorative Service Providers
License No.
7011-26
License State
WI
Taxonomy Description
An occupational therapist is a person who has graduated from an entry-level occupational therapy program accredited by the Accreditation Council for Occupational Therapy Education (ACOTE) or predecessor organizations, or approved by the World Federation of Occupational Therapists (WFOT), or an equivalent international occupational therapy education program; has successfully completed a period of supervised fieldwork experience required by the occupational therapy program; has passed a nationally recognized entry-level examination for occupational therapists, and fulfills state requirements for licensure, certification, or registration. An occupational therapist provides interventions based on evaluation and which emphasize the therapeutic use of everyday life activities (i.e., occupations) with individuals or groups for the purpose of facilitating participation in roles and situations and in home, school, workplace, community and other settings. Occupational therapy services are provided for the purpose of promoting health and wellness and are provided to those who have or are at risk for developing an illness, injury, disease, disorder, condition, impairment, disability, activity limitation, or participation restriction. Occupational therapists address the physical, cognitive, psychosocial, sensory, and other aspects of occupational performance in a variety of contexts to support engagement in everyday life activities that affect health, well-being, and quality of life.

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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 1427983915, we treat the final digit (5) 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 75. The final step is to find the difference between that total and the next multiple of ten (80 - 75 = 5).

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
4
Unchanged
Pos 3
2
Doubled → 4
Pos 4
7
Unchanged
Pos 5
9
Doubled → 18 → 1 + 8
Pos 6
8
Unchanged
Pos 7
3
Doubled → 6
Pos 8
9
Unchanged
Pos 9
1
Doubled → 2
Check
5
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 9 → 18 → 9 3 → 6 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 4 + 4 + 7 + 1 + 8 + 8 + 6 + 9 + 2 + 24 = 75

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

The next multiple of ten after 75 is 80. The difference is the calculated check digit.

80 - 75 = 5
This NPI is valid
The calculated check digit is 5, which matches the last digit of 1427983915.

Other Providers at the Same Location


The following 10 providers are registered at the same or a nearby location.

Local Education Agency (LEA)
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Registered Nurse (School)
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183
Speech-Language Pathologist
563 A J ALLEN CIR
WALES, WI 53183

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1427983915, enumerated as an "individual" on June 16, 2026.

The provider is located at 563 A J ALLEN CIR WALES, WI 53183 and the phone number is (262) 968-6300.

Occupational Therapist with taxonomy code 225X00000X.