KAREN LARSEN
NPI 1538099437
Internal Medicine - Medical Oncology in South Salt Lake, UT
NPI Status: Active since May 21, 2026
Contact Information
2544 S 300 E
SOUTH SALT LAKE, UT
ZIP 84115
Phone: (801) 793-3512
This NPI profile has been added to the NPI registry within the last 30 days.
- Individual
- Female
- Internal Medicine
- Medical Oncology
About KAREN LARSEN
This page provides the complete NPI Profile along with additional information for Karen Larsen, an internist established in South Salt Lake, Utah with a medical specialization in Internal Medicine, focusing in medical oncology . The healthcare provider is registered in the NPI registry with number 1538099437 assigned on May 2026. The practitioner's primary taxonomy code is 207RX0202X with license number 6031374-3102 (UT). The provider is registered as an individual and her NPI record was last updated May 2026.
- NPI
- 1538099437
- Provider Name
- KAREN LARSEN
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 2544 S 300 E SOUTH SALT LAKE, UT 84115
- Location Phone
- (801) 793-3512
- Mailing Address
- 2544 S 300 E SOUTH SALT LAKE, UT 84115
- Is Sole Proprietor?
- No
- Enumeration Date
- 05-21-2026
- Last Update Date
- 05-21-2026
- Code Navigator
An internist like Karen Larsen 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 Medical Oncology
- Taxonomy Code
- 207RX0202X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 6031374-3102
- License State
- UT
- Taxonomy Description
- An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
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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 1538099437, 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 1538099437, enumerated as an "individual" on May 21, 2026.
The provider is located at 2544 S 300 E SOUTH SALT LAKE, UT 84115 and the phone number is (801) 793-3512.
Internal Medicine with taxonomy code 207RX0202X and a focus in Medical Oncology.
