DR. CLARENCE SINN FOOK ING MD
NPI 1083793947
Preventive Medicine - Preventive Medicine/Occupational Environmental Medicine in Weimar, CA
NPI Status: Active since November 03, 2006
Contact Information
20601 WEST PAOLI LANE
WEIMAR, CA
ZIP 95736
Phone: (530) 637-4111
Fax: (530) 637-4443
- Individual
- Male
- Preventive Medicine
- Preventive Medicine/Occupational Environ...
About CLARENCE ING
This page provides the complete NPI Profile along with additional information for Clarence Ing, a provider established in Weimar, California with a medical specialization in Preventive Medicine, focusing in preventive medicine/occupational environmental medicine . The healthcare provider is registered in the NPI registry with number 1083793947 assigned on November 2006. The practitioner's primary taxonomy code is 2083P0500X with license number A21157 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1083793947
- Provider Name
- DR. CLARENCE SINN FOOK ING MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 20601 WEST PAOLI LANE WEIMAR, CA 95736
- Location Phone
- (530) 637-4111
- Location Fax
- (530) 637-4443
- Mailing Address
- PO BOX 486 WEIMAR, CA 95736
- Mailing Phone
- (530) 637-4111
- Mailing Fax
- (530) 637-4443
- Is Sole Proprietor?
- No
- Enumeration Date
- 11-03-2006
- Last Update Date
- 09-11-2025
- 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
Preventive Medicine Preventive Medicine/Occupational Environmental Medicine
- Taxonomy Code
- 2083P0500X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- A21157
- License State
- CA
- Taxonomy Description
- A preventive medicine physician who specializes in preventive medicine/occupational-environmental medicine, which is focused on protecting the population from occupational and environmental conditions.
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 | 207W00000X | Allopathic & Osteopathic Physicians | Ophthalmology | A21157 (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 1083793947, 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 73. The final step is to find the difference between that total and the next multiple of ten (80 - 73 = 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 73 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 9 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1083793947, enumerated as an "individual" on November 03, 2006.
The provider is located at 20601 WEST PAOLI LANE WEIMAR, CA 95736 and the phone number is (530) 637-4111.
Preventive Medicine with taxonomy code 2083P0500X and a focus in Preventive Medicine/Occupational Environmental Medicine.
