ANDREW DAVID JOHNSTON MD
NPI 1427503697
Radiology - Diagnostic Radiology in Chicago, IL
NPI Status: Active since August 17, 2016
Contact Information
240 E HURON ST
SUITE 1-200
CHICAGO, IL
ZIP 60611
Phone: (312) 503-7975
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Radiology
- Diagnostic Radiology
About ANDREW JOHNSTON
This page provides the complete NPI Profile along with additional information for Andrew Johnston, a provider established in Chicago, Illinois with a medical specialization in Radiology, focusing in diagnostic radiology . The healthcare provider is registered in the NPI registry with number 1427503697 assigned on August 2016. The practitioner's primary taxonomy code is 2085R0202X with license number 14272883-1205 (UT). The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1427503697
- Provider Name
- ANDREW DAVID JOHNSTON MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 240 E HURON ST SUITE 1-200 CHICAGO, IL 60611
- Location Phone
- (312) 503-7975
- Mailing Address
- PO BOX 27128 SALT LAKE CITY, UT 84127
- Is Sole Proprietor?
- No
- Enumeration Date
- 08-17-2016
- Last Update Date
- 06-03-2026
- Code Navigator
Location Map
Secondary Locations
- 100 N Mario Capecchi Dr
Salt Lake City, UT 84113
(801) 487-0451
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 Diagnostic Radiology
- Taxonomy Code
- 2085R0202X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 14272883-1205
- License State
- UT
- Taxonomy Description
- A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 2085P0229X | Allopathic & Osteopathic Physicians | Radiology | 14272883-1205 (UT) |
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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 1427503697, 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.
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 63 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
CHICAGO, IL 60611
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1427503697, enumerated as an "individual" on August 17, 2016.
The provider is located at 240 E HURON ST SUITE 1-200 CHICAGO, IL 60611 and the phone number is (312) 503-7975.
Radiology with taxonomy code 2085R0202X and a focus in Diagnostic Radiology.
