DR. AUSTIN WILLIAM TORESDAHL OD
NPI 1013667211
Optometrist in Oak Lawn, IL

NPI Status: Active since March 28, 2022

Contact Information

6201 W 95TH ST
OAK LAWN, IL
ZIP 60453
Phone: (708) 636-9393
Fax: (708) 636-2022

NPI Profile Information
Primary Taxonomy
Secondary Locations
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Optometrist

About AUSTIN TORESDAHL

This page provides the complete NPI Profile along with additional information for Austin Toresdahl, a provider established in Oak Lawn, Illinois with a medical specialization in Optometrist. The healthcare provider is registered in the NPI registry with number 1013667211 assigned on March 2022. The practitioner's primary taxonomy code is 152W00000X with license number 1319 (ZZ). The provider is registered as an individual and his NPI record was last updated 4 years ago.

NPI: 1013667211
Provider Name: DR. AUSTIN WILLIAM TORESDAHL OD
Gender: Male
Entity Type: Individual
Location Address: 6201 W 95TH ST OAK LAWN, IL 60453
Location Phone: (708) 636-9393
Location Fax: (708) 636-2022
Mailing Address: 6201 W 95TH ST OAK LAWN, IL 60453
Mailing Phone: (708) 636-9393
Mailing Fax: (708) 636-2022
Is Sole Proprietor?: No
Enumeration Date: 03-28-2022
Last Update Date: 11-23-2022
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Location Map

Secondary Locations

820 S Damen Ave
Chicago, IL 60612
(403) 878-9956
4459 N Kedzie Ave
Chicago, IL 60625
(773) 866-2020
14494 John Humphrey Dr
Orland Park, IL 60462
(708) 226-9393
68 W Dundee Rd
Buffalo Grove, IL 60089
(847) 541-3334
17W682 Butterfield Rd Ste 101
Oakbrook Terrace, IL 60181
(708) 636-9393

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: Optometrist
Taxonomy Code: 152W00000X
Type: Eye and Vision Services Providers
License No.: 1319
License State: ZZ
Taxonomy Description: Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

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 1013667211, we treat the final digit (1) 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 49. The final step is to find the difference between that total and the next multiple of ten (50 - 49 = 1).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 2

Pos 4

Unchanged

Pos 5

Doubled → 12 → 1 + 2

Pos 6

Unchanged

Pos 7

Doubled → 14 → 1 + 4

Pos 8

Unchanged

Pos 9

Doubled → 2

Check

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 1 → 2 6 → 12 → 3 7 → 14 → 5 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 2 + 3 + 1 + 2 + 6 + 1 + 4 + 2 + 2 + 24 = 49

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

The next multiple of ten after 49 is 50. The difference is the calculated check digit.

50 - 49 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1013667211.