DR. THOMAS WILLIAM CALLAN I M. D.
NPI 1699911487
Internal Medicine - Hematology & Oncology in El Cajon, CA
NPI Status: Active since December 28, 2008
Contact Information
230 CAJON VIEW DR
EL CAJON, CA
ZIP 92020
Phone: (619) 440-4421
Fax: (619) 593-2120
- Individual
- Male
- Internal Medicine
- Hematology & Oncology
About THOMAS CALLAN
This page provides the complete NPI Profile along with additional information for Thomas Callan, an internist established in El Cajon, California with a medical specialization in Internal Medicine, focusing in hematology & oncology . The healthcare provider is registered in the NPI registry with number 1699911487 assigned on December 2008. The practitioner's primary taxonomy code is 207RH0003X with license number GFE26074 (CA). The provider is registered as an individual and his NPI record was last updated 3 years ago.
- NPI
- 1699911487
- Provider Name
- DR. THOMAS WILLIAM CALLAN I M. D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 230 CAJON VIEW DR EL CAJON, CA 92020
- Location Phone
- (619) 440-4421
- Location Fax
- (619) 593-2120
- Mailing Address
- PO BOX 904 EL CAJON, CA 92022
- Mailing Phone
- (619) 440-4421
- Mailing Fax
- (619) 593-2120
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 12-28-2008
- Last Update Date
- 03-07-2023
- Code Navigator
An internist like Thomas Callan 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 Hematology & Oncology
- Taxonomy Code
- 207RH0003X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- GFE26074
- License State
- CA
- Taxonomy Description
- An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
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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 1699911487, 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.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1699911487, enumerated as an "individual" on December 28, 2008.
The provider is located at 230 CAJON VIEW DR EL CAJON, CA 92020 and the phone number is (619) 440-4421.
Internal Medicine with taxonomy code 207RH0003X and a focus in Hematology & Oncology.
