THADDAUS HELLWIG PHARMD
NPI 1366308611
Pharmacist - Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Sioux Falls, SD

NPI Status: Active since December 30, 2025

Contact Information

1305 W 18TH ST
SIOUX FALLS, SD
ZIP 57105
Phone: (605) 333-4290

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

Individual
Male
Pharmacist
Pharmacist Clinician (PhC)/ Clinical Pha...

About THADDAUS HELLWIG

This page provides the complete NPI Profile along with additional information for Thaddaus Hellwig, a provider established in Sioux Falls, South Dakota with a medical specialization in Pharmacist, focusing in pharmacist clinician (phc)/ clinical pharmacy specialist . The healthcare provider is registered in the NPI registry with number 1366308611 assigned on December 2025. The practitioner's primary taxonomy code is 1835P0018X with license number R5643 (SD). The provider is registered as an individual and his NPI record was last updated one year ago. Thaddaus Hellwig operates as a Multi-Specialty Group with one or more individual practitioners, who practice different areas of specialization.

NPI: 1366308611
Provider Name: THADDAUS HELLWIG PHARMD
Gender: Male
Entity Type: Individual
Location Address: 1305 W 18TH ST SIOUX FALLS, SD 57105
Location Phone: (605) 333-4290
Mailing Address: 4301 S JUDY AVE SIOUX FALLS, SD 57103
Is Sole Proprietor?: Yes
Enumeration Date: 12-30-2025
Last Update Date: 12-30-2025
Code Navigator

A pharmacist like Thaddaus Hellwig fills prescription medications, verifying instructions from physicians and offers expertise in the safe use of prescriptions. Pharmacists instruct patients on how to take a prescribed medicine and educate patients about potential side effects. Pharmacists might also conduct health and wellness screenings, provide immunizations, oversee the medications given to patients, and provide advice on healthy lifestyles.

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: Pharmacist Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist
Taxonomy Code: 1835P0018X
Type: Pharmacy Service Providers
License No.: R5643
License State: SD
Taxonomy Description: Pharmacist Clinician/Clinical Pharmacy Specialist is a pharmacist with additional training and an expanded scope of practice that may include prescriptive authority, therapeutic management, and disease management.

Group Taxonomy 193200000X MULTI-SPECIALTY GROUP

This provider is a business group of one or more individual practitioners, who practice with different areas of specialization.

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 1366308611, 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 6

Pos 6

Unchanged

Pos 7

Doubled → 16 → 1 + 6

Pos 8

Unchanged

Pos 9

Doubled → 2

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 6 → 12 → 3 3 → 6 8 → 16 → 7 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 1 + 2 + 6 + 6 + 0 + 1 + 6 + 6 + 2 + 24 = 59

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

The next multiple of ten after 59 is 60. The difference is the calculated check digit.

60 - 59 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1366308611.