ALEX PIEROTTI MENTAL HEALTH COUNSELING PLLC
NPI 1639828601
Counselor - Mental Health in Brooklyn, NY

NPI Status: Active since March 18, 2022

Contact Information

26 COURT ST STE 1001
BROOKLYN, NY
ZIP 11242
Phone: (914) 409-9222

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

Organization
Counselor
Mental Health

About ALEX PIEROTTI MENTAL HEALTH COUNSELING PLLC

This page provides the complete NPI Profile along with additional information for Alex Pierotti Mental Health Counseling Pllc, a provider established in Brooklyn, New York operating as a Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1639828601 assigned on March 2022. The practitioner's primary taxonomy code is 101YM0800X. The provider is registered as an organization and their NPI record was last updated January 2026. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The authorized official of this NPI record is Ms. Alexandra Pierotti Lmhc (Owner)

NPI: 1639828601
Provider Name: ALEX PIEROTTI MENTAL HEALTH COUNSELING PLLC
Entity Type: Organization
Location Address: 26 COURT ST STE 1001 BROOKLYN, NY 11242
Location Phone: (914) 409-9222
Mailing Address: 26 COURT ST STE 1001 BROOKLYN, NY 11242
Mailing Phone: (914) 409-9222
Is Sole Proprietor?: No
Is Organization Subpart?: No
Enumeration Date: 03-18-2022
Last Update Date: 01-24-2026
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A mental health counselor like Alex Pierotti Mental Health Counseling Pllc provides treatment to individuals, families, couples, and groups for mental and emotional health issues and relationship problems. Mental health counselors treat clients with a variety of conditions, including anxiety, depression, grief, low self-esteem, stress, and suicidal impulses.

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 Mental Health
Taxonomy Code: 101YM0800X
Type: Behavioral Health & Social Service Providers

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name: MS. ALEXANDRA PIEROTTI LMHC
Authorized Official Title: OWNER
Authorized Official Phone: (914) 409-9222

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 1639828601, 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 6

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 16 → 1 + 6

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 3 → 6 8 → 16 → 7 8 → 16 → 7 0 → 0

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 6 + 9 + 1 + 6 + 2 + 1 + 6 + 6 + 0 + 24 = 69

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.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1639828601.