FRANCIS SIEW TAN
NPI 1790603637
Licensed Vocational Nurse in Alameda, CA
NPI Status: Active since July 08, 2026
Contact Information
1423 WEBSTER ST
ALAMEDA, CA
ZIP 94501
Phone: (510) 846-6857
This NPI profile has been added to the NPI registry within the last 30 days.
- Individual
- Male
- Licensed Vocational Nurse
About FRANCIS TAN
This page provides the complete NPI Profile along with additional information for Francis Tan, a provider established in Alameda, California with a medical specialization in Licensed Vocational Nurse. The healthcare provider is registered in the NPI registry with number 1790603637 assigned on July 2026. The practitioner's primary taxonomy code is 164X00000X with license number VN742612 (CA). The provider is registered as an individual and his NPI record was last updated July 2026.
- NPI
- 1790603637
- Provider Name
- FRANCIS SIEW TAN
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1423 WEBSTER ST ALAMEDA, CA 94501
- Location Phone
- (510) 846-6857
- Mailing Address
- 1423 WEBSTER ST ALAMEDA, CA 94501
- Mailing Phone
- (510) 846-6857
- Is Sole Proprietor?
- No
- Enumeration Date
- 07-08-2026
- Last Update Date
- 07-08-2026
- 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
Licensed Vocational Nurse
- Taxonomy Code
- 164X00000X
- Type
- Nursing Service Providers
- License No.
- VN742612
- License State
- CA
- Taxonomy Description
- A licensed vocational nurse with post-high school vocational training and practical experience in the provision of nursing care at a level less than that required for certification as a Registered Nurse. [An alternate term for licensed practical nurse arising from difference in occupational titles between states and post-high school training programs and institutions.] Requirements for education, experience, licensure, and job responsibilities vary among the states.
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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 1790603637, we treat the final digit (7) 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 7).
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 63 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 1790603637, enumerated as an "individual" on July 08, 2026.
The provider is located at 1423 WEBSTER ST ALAMEDA, CA 94501 and the phone number is (510) 846-6857.
Licensed Vocational Nurse with taxonomy code 164X00000X.
