ROBERT A. WILLIAMS PH.D.
NPI 1669614723
Psychologist in South San Francisco, CA
NPI Status: Active since April 03, 2009
Contact Information
1115 MISSION RD
SOUTH SAN FRANCISCO, CA
ZIP 94080
Phone: (415) 509-6734
- Individual
- Male
- Psychologist
About ROBERT WILLIAMS
This page provides the complete NPI Profile along with additional information for Robert Williams, a provider established in South San Francisco, California with a medical specialization in Psychologist. The healthcare provider is registered in the NPI registry with number 1669614723 assigned on April 2009. The practitioner's primary taxonomy code is 103T00000X with license number 21573 (CA). The provider is registered as an individual and his NPI record was last updated 17 years ago.
- NPI
- 1669614723
- Provider Name
- ROBERT A. WILLIAMS PH.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1115 MISSION RD SOUTH SAN FRANCISCO, CA 94080
- Location Phone
- (415) 509-6734
- Mailing Address
- 1115 MISSION RD SOUTH SAN FRANCISCO, CA 94080
- Mailing Phone
- (415) 509-6734
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-03-2009
- Last Update Date
- 04-03-2009
- Code Navigator
A psychologist like Robert Williams studies cognitive, emotional, social processes and behavior by observing, interpreting, and recording how people relate to one another and to their environments. Psychologists gather information and evaluate behavior through controlled laboratory experiments, psychoanalysis, psychotherapy or through personality, performance, aptitude, or intelligence tests, and use this information when testing theories in their research or when treating patients.
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
- Taxonomy Code
- 103T00000X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 21573
- License State
- CA
- Taxonomy Description
- A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
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 | 103TA0400X | Behavioral Health & Social Service Providers | Psychologist | 21573 (CA) |
| 2 | 103TC0700X | Behavioral Health & Social Service Providers | Psychologist | 21573 (CA) |
| 3 | 103TC1900X | Behavioral Health & Social Service Providers | Psychologist | 21573 (CA) |
| 4 | 103TC2200X | Behavioral Health & Social Service Providers | Psychologist | 21573 (CA) |
| 5 | 103TF0000X | Behavioral Health & Social Service Providers | Psychologist | 21573 (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 1669614723, we treat the final digit (3) 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 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).
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 67 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.
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1669614723, enumerated as an "individual" on April 03, 2009.
The provider is located at 1115 MISSION RD SOUTH SAN FRANCISCO, CA 94080 and the phone number is (415) 509-6734.
Psychologist with taxonomy code 103T00000X.
