DR. ZACHARY BONZELL MD
NPI 1669111720
Psychiatry & Neurology - Psychiatry in San Francisco, CA

NPI Status: Active since May 27, 2022

Contact Information

675 18TH ST
SAN FRANCISCO, CA
ZIP 94143
Phone: (510) 333-1390

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

Individual
Male
Psychiatry & Neurology
Psychiatry

About ZACHARY BONZELL

This page provides the complete NPI Profile along with additional information for Zachary Bonzell, a provider established in San Francisco, California with a medical specialization in Psychiatry & Neurology, focusing in psychiatry . The healthcare provider is registered in the NPI registry with number 1669111720 assigned on May 2022. The practitioner's primary taxonomy code is 2084P0800X with license number A201283 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1669111720
Provider Name: DR. ZACHARY BONZELL MD
Gender: Male
Entity Type: Individual
Location Address: 675 18TH ST SAN FRANCISCO, CA 94143
Location Phone: (510) 333-1390
Mailing Address: 5649 CASTLE DR OAKLAND, CA 94611
Mailing Phone: (510) 333-1390
Is Sole Proprietor?: No
Enumeration Date: 05-27-2022
Last Update Date: 11-03-2025
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A psychiatrist like Zachary Bonzell 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

Secondary Locations

1801 Vicente St
San Francisco, CA 94116
(415) 681-3211

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.: A201283
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.

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 1669111720, 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 4

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 6 → 12 → 3 1 → 2 1 → 2 2 → 4

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 1 + 2 + 9 + 2 + 1 + 2 + 7 + 4 + 24 = 60

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.

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1669111720.