ISABELLE THERESA DZWONCZYK LPC
NPI 1285584441
Counselor - Professional in Lancaster, PA
NPI Status: Active since January 29, 2026
Contact Information
430 N LIME ST
LANCASTER, PA
ZIP 17602
Phone: (717) 544-1929
Fax: (717) 544-7890
- Individual
- Female
- Counselor
- Professional
About ISABELLE DZWONCZYK
This page provides the complete NPI Profile along with additional information for Isabelle Dzwonczyk, a provider established in Lancaster, Pennsylvania with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1285584441 assigned on January 2026. The practitioner's primary taxonomy code is 101YP2500X with license number PC019326 (PA). The provider is registered as an individual and her NPI record was last updated January 2026.
- NPI
- 1285584441
- Provider Name
- ISABELLE THERESA DZWONCZYK LPC
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 430 N LIME ST LANCASTER, PA 17602
- Location Phone
- (717) 544-1929
- Location Fax
- (717) 544-7890
- Mailing Address
- 430 N LIME ST LANCASTER, PA 17602
- Is Sole Proprietor?
- No
- Enumeration Date
- 01-29-2026
- Last Update Date
- 01-29-2026
- 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
Counselor Professional
- Taxonomy Code
- 101YP2500X
- Type
- Behavioral Health & Social Service Providers
- License No.
- PC019326
- License State
- PA
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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 1285584441, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 69 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1285584441, enumerated as an "individual" on January 29, 2026.
The provider is located at 430 N LIME ST LANCASTER, PA 17602 and the phone number is (717) 544-1929.
Counselor with taxonomy code 101YP2500X and a focus in Professional.
