DR. REBECCA NICHOLE MAHON PHD. DABR
NPI 1003774050
Radiology - Radiological Physics in Springfield, IL

NPI Status: Active since January 09, 2026

Contact Information

701 N 1ST ST
SPRINGFIELD, IL
ZIP 62781
Phone: (217) 788-3000

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

Individual
Female
Radiology
Radiological Physics

About REBECCA MAHON

This page provides the complete NPI Profile along with additional information for Rebecca Mahon, a provider established in Springfield, Illinois with a medical specialization in Radiology, focusing in radiological physics . The healthcare provider is registered in the NPI registry with number 1003774050 assigned on January 2026. The practitioner's primary taxonomy code is 2085R0205X with license number 1691 (IL). The provider is registered as an individual and her NPI record was last updated January 2026.

NPI: 1003774050
Provider Name: DR. REBECCA NICHOLE MAHON PHD. DABR
Gender: Female
Entity Type: Individual
Location Address: 701 N 1ST ST SPRINGFIELD, IL 62781
Location Phone: (217) 788-3000
Mailing Address: ATTENTION: RADIATION ONCOLOGY P.O. BOX 19248 SPRINGFIELD, IL 62794
Mailing Phone: (217) 582-7541
Is Sole Proprietor?: No
Enumeration Date: 01-09-2026
Last Update Date: 01-09-2026
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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: Radiology Radiological Physics
Taxonomy Code: 2085R0205X
Type: Allopathic & Osteopathic Physicians
License No.: 1691
License State: IL
Taxonomy Description: A radiological physicist deals with the diagnostic and therapeutic applications of roentgen rays, gamma rays from sealed sources, ultrasonic radiation and radio-frequency radiation, as well as the equipment associated with their production and use, including radiation safety.

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 1003774050, we treat the final digit (0) 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 50. The final step is to find the difference between that total and the next multiple of ten (50 - 50 = 0).

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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

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 0 → 0 7 → 14 → 5 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 + 0 + 0 + 3 + 1 + 4 + 7 + 8 + 0 + 1 + 0 + 24 = 50

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

The next multiple of ten after 50 is 50. The difference is the calculated check digit.

50 - 50 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1003774050.