DANIELLE WILLIAMS
NPI 1649891789
Counselor - Professional in Naperville, IL

NPI Status: Active since April 29, 2020

Contact Information

1979 N MILL ST STE 202
NAPERVILLE, IL
ZIP 60563
Phone: (630) 281-2496

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

Individual
Female
Counselor
Professional

About DANIELLE WILLIAMS

This page provides the complete NPI Profile along with additional information for Danielle Williams, a provider established in Naperville, Illinois with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1649891789 assigned on April 2020. The practitioner's primary taxonomy code is 101YP2500X. The provider is registered as an individual and her NPI record was last updated 6 years ago.

NPI: 1649891789
Provider Name: DANIELLE WILLIAMS
Gender: Female
Entity Type: Individual
Location Address: 1979 N MILL ST STE 202 NAPERVILLE, IL 60563
Location Phone: (630) 281-2496
Mailing Address: 311 CHICAGO AVE DOWNERS GROVE, IL 60515
Is Sole Proprietor?: Yes
Enumeration Date: 04-29-2020
Last Update Date: 04-29-2020
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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: Counselor Professional
Taxonomy Code: 101YP2500X
Type: Behavioral Health & Social Service Providers
License State: IL

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No.	Taxonomy Code	Type	Classification / Specialization	License No. (State)
1	101YP2500X	Behavioral Health & Social Service Providers	Counselor Professional

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 1649891789, we treat the final digit (9) 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 81. The final step is to find the difference between that total and the next multiple of ten (90 - 81 = 9).

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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 6

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 4 → 8 8 → 16 → 7 1 → 2 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 8 + 9 + 1 + 6 + 9 + 2 + 7 + 1 + 6 + 24 = 81

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

The next multiple of ten after 81 is 90. The difference is the calculated check digit.

90 - 81 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1649891789.