DR. WILLIAM RITCHIE MACKENZIE M.D.
NPI 1073561601
Internal Medicine - Infectious Disease in Mather, CA
- Individual
- Male
- Internal Medicine
- Infectious Disease
About WILLIAM MACKENZIE
This page provides the complete NPI Profile along with additional information for William Mackenzie, an internist established in Mather, California with a medical specialization in Internal Medicine, focusing in infectious disease . The healthcare provider is registered in the NPI registry with number 1073561601 assigned on May 2006. The practitioner's primary taxonomy code is 207RI0200X with license number G59633 (CA). The provider is registered as an individual and his NPI record was last updated July 2026.
- NPI
- 1073561601
- Provider Name
- DR. WILLIAM RITCHIE MACKENZIE M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 10535 HOSPITAL WAY MATHER, CA 95655
- Location Phone
- (916) 843-7107
- Mailing Address
- 380 WORLD WAY BOX N-19 LOS ANGELES, CA 90045
- Mailing Phone
- (310) 215-2365
- Mailing Fax
- (310) 215-2285
- Is Sole Proprietor?
- No
- Enumeration Date
- 05-05-2006
- Last Update Date
- 07-13-2026
- Code Navigator
An internist like William Mackenzie is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
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
Internal Medicine Infectious Disease
- Taxonomy Code
- 207RI0200X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G59633
- License State
- CA
- Taxonomy Description
- An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
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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 1073561601, we treat the final digit (1) 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 49. The final step is to find the difference between that total and the next multiple of ten (50 - 49 = 1).
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 49 is 50. 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.
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
MATHER, CA 95655
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1073561601, enumerated as an "individual" on May 05, 2006.
The provider is located at 10535 HOSPITAL WAY MATHER, CA 95655 and the phone number is (916) 843-7107.
Internal Medicine with taxonomy code 207RI0200X and a focus in Infectious Disease.
