MADELYN GREENFIELD CLS
NPI 1023967486
Lactation Consultant, Non-RN in Freeport, IL

NPI Status: Active since January 27, 2026

Contact Information

10 W LINDEN ST
FREEPORT, IL
ZIP 61032
Phone: (815) 235-8360
Fax: (815) 232-7160

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

Individual
Female
Lactation Consultant, Non-RN

About MADELYN GREENFIELD

This page provides the complete NPI Profile along with additional information for Madelyn Greenfield, a provider established in Freeport, Illinois with a medical specialization in Lactation Consultant, Non-rn. The healthcare provider is registered in the NPI registry with number 1023967486 assigned on January 2026. The practitioner's primary taxonomy code is 174N00000X with license number 240303 (IL). The provider is registered as an individual and her NPI record was last updated January 2026.

NPI: 1023967486
Provider Name: MADELYN GREENFIELD CLS
Gender: Female
Entity Type: Individual
Location Address: 10 W LINDEN ST FREEPORT, IL 61032
Location Phone: (815) 235-8360
Location Fax: (815) 232-7160
Mailing Address: 10 W LINDEN ST FREEPORT, IL 61032
Mailing Phone: (815) 235-8360
Mailing Fax: (815) 232-7160
Is Sole Proprietor?: No
Enumeration Date: 01-27-2026
Last Update Date: 01-27-2026
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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: Lactation Consultant, Non-RN
Taxonomy Code: 174N00000X
Type: Other Service Providers
License No.: 240303
License State: IL
Taxonomy Description: An individual trained to provide breastfeeding assistance services to both mothers and infants. Lactation Consultants are not required to be nurses and are trained through specific courses of education. The Lactation Consultant may have additional certification through a national or international organization.

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 1023967486, we treat the final digit (6) 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 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 6).

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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 14 → 1 + 4

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 2 → 4 9 → 18 → 9 7 → 14 → 5 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 4 + 3 + 1 + 8 + 6 + 1 + 4 + 4 + 1 + 6 + 24 = 64

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

The next multiple of ten after 64 is 70. The difference is the calculated check digit.

70 - 64 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1023967486.