KATHERINE LORRAINE DUFF OD
NPI 1124956909
Student in an Organized Health Care Education/Training Program in White River Junction, VT

NPI Status: Active since May 12, 2026

Contact Information

163 VETERANS DR
WHITE RIVER JUNCTION, VT
ZIP 05001
Phone: (802) 295-9363

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

Table of Contents

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

Individual
Female
Student in an Organized Health Care Educ...

About KATHERINE DUFF

This page provides the complete NPI Profile along with additional information for Katherine Duff, a primary care provider established in White River Junction, Vermont with a medical specialization in Student In An Organized Health Care Education/training Program. The healthcare provider is registered in the NPI registry with number 1124956909 assigned on May 2026. The practitioner's primary taxonomy code is 390200000X. The provider is registered as an individual and her NPI record was last updated May 2026.

NPI: 1124956909
Provider Name: KATHERINE LORRAINE DUFF OD
Gender: Female
Entity Type: Individual
Location Address: 163 VETERANS DR WHITE RIVER JUNCTION, VT 05001
Location Phone: (802) 295-9363
Mailing Address: 7868 POMFRET RD PO BOX 212 NORTH POMFRET, VT 05053
Mailing Phone: (970) 227-8013
Is Sole Proprietor?: No
Enumeration Date: 05-12-2026
Last Update Date: 05-12-2026
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A primary care provider (PCP) like Katherine Duff sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, etc .

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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: Student in an Organized Health Care Education/Training Program
Taxonomy Code: 390200000X
Type: Student, Health Care
Taxonomy Description: An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.

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 1124956909, 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 12 → 1 + 2

Pos 8

Unchanged

Pos 9

Doubled → 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 2 → 4 9 → 18 → 9 6 → 12 → 3 0 → 0

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 4 + 4 + 1 + 8 + 5 + 1 + 2 + 9 + 0 + 24 = 61

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

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1124956909.