LEO GEFTER
NPI 1164162087
Psychiatry & Neurology - Addiction Psychiatry in New Haven, CT
NPI Status: Active since March 30, 2022
Contact Information
300 GEORGE ST STE 900
NEW HAVEN, CT
ZIP 06511
Phone: (203) 785-2117
Fax: (203) 785-7357
- Individual
- Male
- Psychiatry & Neurology
- Addiction Psychiatry
About LEO GEFTER
This page provides the complete NPI Profile along with additional information for Leo Gefter, a provider established in New Haven, Connecticut with a medical specialization in Psychiatry & Neurology, focusing in addiction psychiatry . The healthcare provider is registered in the NPI registry with number 1164162087 assigned on March 2022. The practitioner's primary taxonomy code is 2084P0802X with license number 83998 (CT). The provider is registered as an individual and his NPI record was last updated April 2026.
- NPI
- 1164162087
- Provider Name
- LEO GEFTER
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 300 GEORGE ST STE 900 NEW HAVEN, CT 06511
- Location Phone
- (203) 785-2117
- Location Fax
- (203) 785-7357
- Mailing Address
- 21 DOGWOOD LN HASKELL, NJ 07420
- Mailing Phone
- (201) 410-0611
- Is Sole Proprietor?
- No
- Enumeration Date
- 03-30-2022
- Last Update Date
- 04-02-2026
- 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
Psychiatry & Neurology Addiction Psychiatry
- Taxonomy Code
- 2084P0802X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 83998
- License State
- CT
- Taxonomy Description
- Addiction Psychiatry is a subspecialty of psychiatry that focuses on evaluation and treatment of individuals with alcohol, drug, or other substance-related disorders, and of individuals with dual diagnosis of substance-related and other psychiatric disorders.
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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 1164162087, 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 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.
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 53 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 1 provider is registered at the same or a nearby location.
NEW HAVEN, CT 06511
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1164162087, enumerated as an "individual" on March 30, 2022.
The provider is located at 300 GEORGE ST STE 900 NEW HAVEN, CT 06511 and the phone number is (203) 785-2117.
Psychiatry & Neurology with taxonomy code 2084P0802X and a focus in Addiction Psychiatry.
