BRUCE G WOLFF M.D.
NPI 1619956257
Colon & Rectal Surgery in Rochester, MN

NPI Status: Active since January 12, 2006

Contact Information

200 1ST ST SW
ROCHESTER, MN
ZIP 55905
Phone: (507) 284-2511

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

Individual
Male
Colon & Rectal Surgery

About BRUCE WOLFF

This page provides the complete NPI Profile along with additional information for Bruce Wolff, a provider established in Rochester, Minnesota with a medical specialization in Colon & Rectal Surgery. The healthcare provider is registered in the NPI registry with number 1619956257 assigned on January 2006. The practitioner's primary taxonomy code is 208C00000X with license number 26680 (MN). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1619956257
Provider Name: BRUCE G WOLFF M.D.
Gender: Male
Entity Type: Individual
Location Address: 200 1ST ST SW ROCHESTER, MN 55905
Location Phone: (507) 284-2511
Mailing Address: 200 1ST ST SW ROCHESTER, MN 55905
Mailing Phone: (507) 284-2511
Is Sole Proprietor?: No
Enumeration Date: 01-12-2006
Last Update Date: 05-03-2026
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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: Colon & Rectal Surgery
Taxonomy Code: 208C00000X
Type: Allopathic & Osteopathic Physicians
License No.: 26680
License State: MN
Taxonomy Description: A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.

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 1619956257, 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 2

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 12 → 1 + 2

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 1 → 2 9 → 18 → 9 6 → 12 → 3 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 2 + 9 + 1 + 8 + 5 + 1 + 2 + 2 + 1 + 0 + 24 = 63

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

The next multiple of ten after 63 is 70. The difference is the calculated check digit.

70 - 63 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1619956257.