BLAKE R WILLIAMS
NPI 1891629762
Assisted Living Facility - Assisted Living, Behavioral Disturbances in San Francisco, CA
NPI Status: Active since June 09, 2026
Contact Information
165 GUERRERO ST
SAN FRANCISCO, CA
ZIP 94103
Phone: (480) 442-4084
This NPI profile has been added to the NPI registry within the last 30 days.
- Individual
- Male
- Assisted Living Facility
- Assisted Living, Behavioral Disturbances
About BLAKE WILLIAMS
This page provides the complete NPI Profile along with additional information for Blake Williams, a provider established in San Francisco, California with a medical specialization in Assisted Living Facility, focusing in assisted living, behavioral disturbances . The healthcare provider is registered in the NPI registry with number 1891629762 assigned on June 2026. The practitioner's primary taxonomy code is 3104A0630X. The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1891629762
- Provider Name
- BLAKE R WILLIAMS
- Other Name
- GENERAL SERVICE APPRAISER
- Other Name Type
- Other Name (5)
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 165 GUERRERO ST SAN FRANCISCO, CA 94103
- Location Phone
- (480) 442-4084
- Mailing Address
- 19414 N 25TH ST PHOENIX, AZ 85050
- Mailing Phone
- (480) 442-4084
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-09-2026
- Last Update Date
- 06-10-2026
- 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
Assisted Living Facility Assisted Living, Behavioral Disturbances
- Taxonomy Code
- 3104A0630X
- Type
- Nursing & Custodial Care Facilities
- License State
- CA
- Taxonomy Description
- A facility providing supportive services to individuals who can function independently in most areas of activity, but exhibit abnormal behavioral responses and habits and therefore need special guidance, assistance and/or monitoring to assure safety and well being. This type of facility requires a staff with special training in dealing with and redirecting negative, violent or destructive behaviors.
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 | 310400000X | Nursing & Custodial Care Facilities | Assisted Living Facility | (CA) |
| 2 | 3104A0625X | Nursing & Custodial Care Facilities | Assisted Living Facility | (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 1891629762, we treat the final digit (2) 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 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).
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 68 is 70. 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.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1891629762, enumerated as an "individual" on June 09, 2026.
The provider is located at 165 GUERRERO ST SAN FRANCISCO, CA 94103 and the phone number is (480) 442-4084.
Assisted Living Facility with taxonomy code 3104A0630X and a focus in Assisted Living, Behavioral Disturbances.
