JEFFREY MARCUS CASAC-T
NPI 1700489937
Counselor - Addiction (Substance Use Disorder) in Brooklyn, NY

NPI Status: Active since November 19, 2020

Contact Information

255 AVENUE W
BROOKLYN, NY
ZIP 11223
Phone: (866) 569-7233
Fax: (718) 336-6815

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

Individual
Male
Counselor
Addiction (Substance Use Disorder)

About JEFFREY MARCUS

This page provides the complete NPI Profile along with additional information for Jeffrey Marcus, a provider established in Brooklyn, New York with a medical specialization in Counselor, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1700489937 assigned on November 2020. The practitioner's primary taxonomy code is 101YA0400X with license number 36747 (NY). The provider is registered as an individual and his NPI record was last updated 6 years ago.

NPI: 1700489937
Provider Name: JEFFREY MARCUS CASAC-T
Gender: Male
Entity Type: Individual
Location Address: 255 AVENUE W BROOKLYN, NY 11223
Location Phone: (866) 569-7233
Location Fax: (718) 336-6815
Mailing Address: PO BOX 230060 BROOKLYN, NY 11223
Mailing Phone: (866) 569-7233
Mailing Fax: (718) 336-6815
Is Sole Proprietor?: No
Enumeration Date: 11-19-2020
Last Update Date: 11-19-2020
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A Substance Abuse or Addiction Counselor like Jeffrey Marcus advices patients who experience alcoholism, drug addiction, eating disorders, mental health issues, or other mental or behavioral problems. Substance Abuse counselors provide treatment and support to help clients recover from addiction or modify problem behaviors. Many counselors incorporate the principles of 12-step programs, such as Alcoholics Anonymous (AA). They educate clients how to cope with stress and life’s issues in ways that help them recover. Counselors also help patients improve their personal relationships and find ways to discuss their addiction or other problems with family and friends.

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 Addiction (Substance Use Disorder)
Taxonomy Code: 101YA0400X
Type: Behavioral Health & Social Service Providers
License No.: 36747
License State: NY

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 1700489937, we treat the final digit (7) 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 73. The final step is to find the difference between that total and the next multiple of ten (80 - 73 = 7).

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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 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 0 → 0 4 → 8 9 → 18 → 9 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 7 + 0 + 0 + 8 + 8 + 1 + 8 + 9 + 6 + 24 = 73

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

The next multiple of ten after 73 is 80. The difference is the calculated check digit.

80 - 73 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1700489937.