DR. MARK RICHARD ZASLAV PH.D.
NPI 1255486270
Psychologist - Addiction (Substance Use Disorder) in Corte Madera, CA
NPI Status: Active since January 23, 2007
Contact Information
21 TAMAL VISTA BLVD STE 120
CORTE MADERA, CA
ZIP 94925
Phone: (415) 927-1560
- Individual
- Male
- Psychologist
- Addiction (Substance Use Disorder)
About MARK ZASLAV
This page provides the complete NPI Profile along with additional information for Mark Zaslav, a provider established in Corte Madera, California with a medical specialization in Psychologist, focusing in addiction (substance use disorder) . The healthcare provider is registered in the NPI registry with number 1255486270 assigned on January 2007. The practitioner's primary taxonomy code is 103TA0400X with license number PSY 9205 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1255486270
- Provider Name
- DR. MARK RICHARD ZASLAV PH.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 21 TAMAL VISTA BLVD STE 120 CORTE MADERA, CA 94925
- Location Phone
- (415) 927-1560
- Mailing Address
- 2 GLEN WAY LARKSPUR, CA 94939
- Mailing Phone
- (415) 927-1560
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 01-23-2007
- Last Update Date
- 09-11-2025
- 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
Psychologist Addiction (Substance Use Disorder)
- Taxonomy Code
- 103TA0400X
- Type
- Behavioral Health & Social Service Providers
- License No.
- PSY 9205
- License State
- CA
- Taxonomy Description
- A psychologist with a proficiency that involves the application of psychological treatment of addiction stemming from the use of alcohol and other psychoactive substances (e.g., nicotine, marijuana, cocaine, heroin) or behavioral addictions (e.g., gambling) with the aim of cessation or reduction of use and/or the amelioration of emotional, behavioral, interpersonal and other problems arising from the addictive behavior.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 103TC0700X | Behavioral Health & Social Service Providers | Psychologist | PSY 9205 (CA) |
| 2 | 103TF0200X | Behavioral Health & Social Service Providers | Psychologist | PSY 9205 (CA) |
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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 1255486270, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).
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 60 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1255486270, enumerated as an "individual" on January 23, 2007.
The provider is located at 21 TAMAL VISTA BLVD STE 120 CORTE MADERA, CA 94925 and the phone number is (415) 927-1560.
Psychologist with taxonomy code 103TA0400X and a focus in Addiction (Substance Use Disorder).
