ALEXANDRA MARIE PEFFER BSN, MSN, FNP-C
NPI 1013883883
Nurse Practitioner - Family in Danvers, MA

NPI Status: Active since October 16, 2025

Contact Information

99 CONIFER HILL DR
DANVERS, MA
ZIP 01923
Phone: (978) 774-2555
Fax: (978) 774-8715

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

Individual
Female
Nurse Practitioner
Family

About ALEXANDRA PEFFER

This page provides the complete NPI Profile along with additional information for Alexandra Peffer, a provider established in Danvers, Massachusetts with a medical specialization in Nurse Practitioner, focusing in family . The healthcare provider is registered in the NPI registry with number 1013883883 assigned on October 2025. The practitioner's primary taxonomy code is 363LF0000X with license number RN2352530 (MA). The provider is registered as an individual and her NPI record was last updated December 2025.

NPI: 1013883883
Provider Name: ALEXANDRA MARIE PEFFER BSN, MSN, FNP-C
Gender: Female
Entity Type: Individual
Location Address: 99 CONIFER HILL DR DANVERS, MA 01923
Location Phone: (978) 774-2555
Location Fax: (978) 774-8715
Mailing Address: 147 S MAIN ST MIDDLETON, MA 01949
Mailing Phone: (978) 774-2555
Mailing Fax: (978) 774-8715
Is Sole Proprietor?: No
Enumeration Date: 10-16-2025
Last Update Date: 12-12-2025
Code Navigator

A nurse practitioner (NP) like Alexandra Peffer 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

Secondary Locations

147 S Main St
Middleton, MA 01949
(978) 774-2555

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 Family
Taxonomy Code: 363LF0000X
Type: Physician Assistants & Advanced Practice Nursing Providers
License No.: RN2352530
License State: MA

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 1013883883, we treat the final digit (3) 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 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).

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 → 2

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 6

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 1 → 2 8 → 16 → 7 3 → 6 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 + 2 + 3 + 1 + 6 + 8 + 6 + 8 + 1 + 6 + 24 = 67

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

The next multiple of ten after 67 is 70. The difference is the calculated check digit.

70 - 67 = 3

This NPI is valid

The calculated check digit is 3, which matches the last digit of 1013883883.