SYDNEY DALE FERSTEIN
NPI 1295350353
Speech-Language Pathologist in Buffalo Grove, IL

NPI Status: Active since June 14, 2020

Contact Information

275 W DUNDEE RD
BUFFALO GROVE, IL
ZIP 60089
Phone: (847) 777-8995

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

Individual
Female
Speech-Language Pathologist

About SYDNEY FERSTEIN

This page provides the complete NPI Profile along with additional information for Sydney Ferstein, a provider established in Buffalo Grove, Illinois with a medical specialization in Speech-language Pathologist. The healthcare provider is registered in the NPI registry with number 1295350353 assigned on June 2020. The practitioner's primary taxonomy code is 235Z00000X. The provider is registered as an individual and her NPI record was last updated 6 years ago.

NPI: 1295350353
Provider Name: SYDNEY DALE FERSTEIN
Gender: Female
Entity Type: Individual
Location Address: 275 W DUNDEE RD BUFFALO GROVE, IL 60089
Location Phone: (847) 777-8995
Mailing Address: 1215 DEVONSHIRE RD BUFFALO GROVE, IL 60089
Mailing Phone: (847) 651-5305
Is Sole Proprietor?: No
Enumeration Date: 06-14-2020
Last Update Date: 06-14-2020
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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: Speech-Language Pathologist
Taxonomy Code: 235Z00000X
Type: Speech, Language and Hearing Service Providers
Taxonomy Description: The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing.

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 1295350353, 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 57. The final step is to find the difference between that total and the next multiple of ten (60 - 57 = 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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 18 → 1 + 8

Pos 4

Unchanged

Pos 5

Doubled → 6

Pos 6

Unchanged

Pos 7

Doubled → 0

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

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 9 → 18 → 9 3 → 6 0 → 0 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 1 + 8 + 5 + 6 + 5 + 0 + 3 + 1 + 0 + 24 = 57

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

The next multiple of ten after 57 is 60. The difference is the calculated check digit.

60 - 57 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1295350353.