DR. EDWARD WILLIAM ZEFF M.D.
NPI 1548302508
Psychiatry & Neurology - Psychiatry in San Mateo, CA
NPI Status: Active since February 13, 2007
Contact Information
100 S ELLSWORTH AVE
STE.611
SAN MATEO, CA
ZIP 94401
Phone: (650) 599-1836
NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: July 12, 2026.
- Individual
- Male
- Psychiatry & Neurology
- Psychiatry
About EDWARD ZEFF
This page provides the complete NPI Profile along with additional information for Edward Zeff, a provider established in San Mateo, California with a medical specialization in Psychiatry & Neurology, focusing in psychiatry . The healthcare provider is registered in the NPI registry with number 1548302508 assigned on February 2007. The practitioner's primary taxonomy code is 2084P0800X with license number G13543 (CA). The provider is registered as an individual and his NPI record was last updated 19 years ago.
- NPI
- 1548302508
- Provider Name
- DR. EDWARD WILLIAM ZEFF M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 100 S ELLSWORTH AVE STE.611 SAN MATEO, CA 94401
- Location Phone
- (650) 599-1836
- Mailing Address
- 100 S ELLSWORTH AVE STE.611 SAN MATEO, CA 94401
- Mailing Phone
- (650) 599-1836
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 02-13-2007
- Last Update Date
- 07-08-2007
- Code Navigator
A psychiatrist like Edward Zeff are primary mental health physicians diagnose and treat mental illnesses through psychotherapy, psychoanalysis, hospitalization and medication. Psychiatrist help patients find solutions through changes in their behavioral patterns, explorations of experiences, group and family therapy.
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 Psychiatry
- Taxonomy Code
- 2084P0800X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G13543
- License State
- CA
- Taxonomy Description
- A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
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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 1548302508, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).
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 62 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
SAN MATEO, CA 94401
SAN MATEO, CA 94401
SAN MATEO, CA 94401
SAN MATEO, CA 94401
SAN MATEO, CA 94401
SAN MATEO, CA 94401
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1548302508, enumerated as an "individual" on February 13, 2007.
The provider is located at 100 S ELLSWORTH AVE STE.611 SAN MATEO, CA 94401 and the phone number is (650) 599-1836.
Psychiatry & Neurology with taxonomy code 2084P0800X and a focus in Psychiatry.
