DIANE WITKOWSKI
NPI 1720483456
Nurse Practitioner in Frederick, MD

NPI Status: Active since October 23, 2014

Contact Information

617 W PATRICK ST
FREDERICK, MD
ZIP 21701
Phone: (240) 405-8084

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

Individual
Female
Nurse Practitioner

About DIANE WITKOWSKI

This page provides the complete NPI Profile along with additional information for Diane Witkowski, a provider established in Frederick, Maryland with a medical specialization in Nurse Practitioner. The healthcare provider is registered in the NPI registry with number 1720483456 assigned on October 2014. The practitioner's primary taxonomy code is 363L00000X with license number R186991 (MD). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1720483456
Provider Name: DIANE WITKOWSKI
Gender: Female
Entity Type: Individual
Location Address: 617 W PATRICK ST FREDERICK, MD 21701
Location Phone: (240) 405-8084
Mailing Address: 912 LARCH AVE TAKOMA PARK, MD 20912
Mailing Phone: (301) 270-8316
Is Sole Proprietor?: No
Enumeration Date: 10-23-2014
Last Update Date: 06-13-2025
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A nurse practitioner (NP) like Diane Witkowski is an experienced registered nurse with a master’s or doctoral degree and advanced clinical training. Nurse practitioners can work in many different specialties including primary care, pediatrics, cardiology, emergency, women’s health, oncology or geriatrics. Nurse practitioners provide services like physical exams, order laboratory tests, manage diseases, write prescriptions, etc.

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: Nurse Practitioner
Taxonomy Code: 363L00000X
Type: Physician Assistants & Advanced Practice Nursing Providers
License No.: R186991
License State: MD
Taxonomy Description: (1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

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 1720483456, 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 → 8

Pos 6

Unchanged

Pos 7

Doubled → 6

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 2 → 4 4 → 8 3 → 6 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 7 + 4 + 0 + 8 + 8 + 6 + 4 + 1 + 0 + 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 1720483456.