LARRY TAFT NELSEN M.D.
NPI 1821074154
Pathology - Clinical Pathology/Laboratory Medicine in Austin, MN

Q: What is the provider's specialty?

The provider's specialty is Pathology with taxonomy code 207ZP0105X and a focus in Clinical Pathology/Laboratory Medicine.

NPI Status: Active since December 19, 2005

Contact Information

1000 1ST DR NW
AUSTIN, MN
ZIP 55912
Phone: (507) 434-1092
Fax: (507) 434-1477

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Recently Updated NPI Information
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Table of Contents

NPI Profile Information
Primary Taxonomy
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Pathology
Clinical Pathology/Laboratory Medicine

About LARRY NELSEN

This page provides the complete NPI Profile along with additional information for Larry Nelsen, a provider established in Austin, Minnesota with a medical specialization in Pathology, focusing in clinical pathology/laboratory medicine . The healthcare provider is registered in the NPI registry with number 1821074154 assigned on December 2005. The practitioner's primary taxonomy code is 207ZP0105X with license number 20617 (MN). The provider is registered as an individual and his NPI record was last updated July 2026.

NPI: 1821074154
Provider Name: LARRY TAFT NELSEN M.D.
Gender: Male
Entity Type: Individual
Location Address: 1000 1ST DR NW AUSTIN, MN 55912
Location Phone: (507) 434-1092
Location Fax: (507) 434-1477
Mailing Address: 1000 1ST DR NW AUSTIN, MN 55912
Mailing Phone: (507) 434-1092
Mailing Fax: (507) 434-1477
Is Sole Proprietor?: No
Enumeration Date: 12-19-2005
Last Update Date: 07-13-2026
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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: Pathology Clinical Pathology/Laboratory Medicine
Taxonomy Code: 207ZP0105X
Type: Allopathic & Osteopathic Physicians
License No.: 20617
License State: MN
Taxonomy Description: A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.

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 1821074154, we treat the final digit (4) 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 56. The final step is to find the difference between that total and the next multiple of ten (60 - 56 = 4).

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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 4

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

Check

Target digit

Regular digit Doubled digit Check digit

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.

1 → 2 2 → 4 0 → 0 4 → 8 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 4 + 1 + 0 + 7 + 8 + 1 + 1 + 0 + 24 = 56

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 56 is 60. The difference is the calculated check digit.

60 - 56 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1821074154.