OAK LEYDEN DEVELOPMENTAL SERVICES
NPI 1033254347
Speech-Language Pathologist in Oak Park, IL

NPI Status: Active since February 21, 2007

Contact Information

411 CHICAGO AVE
OAK PARK, IL
ZIP 60302
Phone: (708) 524-1050
Fax: (708) 524-2469

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

Organization
Speech-Language Pathologist
CLIA Number: 14D2204320
CLIA Cert. Type: Other - NONPROFIT RES SERVICES
CLIA Exp. Date: 12-07-2026

About OAK LEYDEN DEVELOPMENTAL SERVICES

This page provides the complete NPI Profile along with additional information for Oak Leyden Developmental Services, a provider established in Oak Park, Illinois operating as a Speech-language Pathologist. The healthcare provider is registered in the NPI registry with number 1033254347 assigned on February 2007. The practitioner's primary taxonomy code is 235Z00000X with license number 146003481 (IL). The provider is registered as an organization and their NPI record was last updated one year ago. The authorized official of this NPI record is Melissa Ehmann (Director Of Children Services)

NPI: 1033254347
Provider Name: OAK LEYDEN DEVELOPMENTAL SERVICES
Entity Type: Organization
Location Address: 411 CHICAGO AVE OAK PARK, IL 60302
Location Phone: (708) 524-1050
Location Fax: (708) 524-2469
Mailing Address: 411 CHICAGO AVE OAK PARK, IL 60302
Mailing Phone: (708) 524-1050
Mailing Fax: (708) 524-2469
Is Sole Proprietor?: No
Is Organization Subpart?: No
Enumeration Date: 02-21-2007
Last Update Date: 01-27-2025
Code Navigator

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: Speech-Language Pathologist
Taxonomy Code: 235Z00000X
Type: Speech, Language and Hearing Service Providers
License No.: 146003481
License State: IL
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.

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	1041C0700X	Behavioral Health & Social Service Providers	Social Worker Clinical
2	222Q00000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Developmental Therapist	(IL)
3	225100000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Physical Therapist	070002012 (IL)
4	225100000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Physical Therapist	070004000 (IL)
5	225100000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Physical Therapist	070011242 (IL)
6	225100000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Physical Therapist	070008117 (IL)
7	225X00000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Occupational Therapist	056003098 (IL)
8	225X00000X	Respiratory, Developmental, Rehabilitative and Restorative Service Providers	Occupational Therapist	056001573 (IL)
9	235Z00000X	Speech, Language and Hearing Service Providers	Speech-Language Pathologist	146005747 (IL)
10	235Z00000X	Speech, Language and Hearing Service Providers	Speech-Language Pathologist	146008122 (IL)
11	235Z00000X	Speech, Language and Hearing Service Providers	Speech-Language Pathologist	146008222 (IL)
12	235Z00000X	Speech, Language and Hearing Service Providers	Speech-Language Pathologist	146008395 (IL)

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: MELISSA EHMANN
Authorized Official Title: DIRECTOR OF CHILDREN SERVICES
Authorized Official Phone: (708) 524-1050

CLIA Information

The Clinical Laboratory Improvement Amendments (CLIA) of 1988 applies to facilities or sites that test human specimens for health assessment or to diagnose, prevent, or treat disease. The CLIA Program sets standards for clinical laboratory testing and issues certificates. The NPI / CLIA crosswalk information for this NPI number is:

CLIA Number: 14D2204320
Facility Type: Other - NONPROFIT RES SERVICES
Certificate Effective Date: December 08, 2024
Certificate Expiration Date: December 07, 2026
Laboratory Director: MARIA J. MARTINEZ
Certificate Type: Certificate of Waiver
Certificate Type Description: This CLIA certificate is issued to Oak Leyden Developmental Services to perform only waived tests. CLIA defines waived tests as simple tests with a low risk for an incorrect result. Waived tests include certain tests listed in CLIA regulations, tests cleared by the FDA for home use and tests approved by the FDA for waived status and that meet CLIA waiver criteria.

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 1033254347, we treat the final digit (7) 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 7).

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 → 6

Pos 4

Unchanged

Pos 5

Doubled → 4

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 8

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 3 → 6 2 → 4 4 → 8 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 6 + 3 + 4 + 5 + 8 + 3 + 8 + 24 = 63

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

The next multiple of ten after 63 is 70. The difference is the calculated check digit.

70 - 63 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1033254347.